gmock-matchers.h 141 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
// Copyright 2007, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Author: wan@google.com (Zhanyong Wan)

// Google Mock - a framework for writing C++ mock classes.
//
// This file implements some commonly used argument matchers.  More
// matchers can be defined by the user implementing the
// MatcherInterface<T> interface if necessary.

#ifndef GMOCK_INCLUDE_GMOCK_GMOCK_MATCHERS_H_
#define GMOCK_INCLUDE_GMOCK_GMOCK_MATCHERS_H_

41
#include <math.h>
zhanyong.wan's avatar
zhanyong.wan committed
42
#include <algorithm>
43
#include <iterator>
44
#include <limits>
45
46
47
#include <ostream>  // NOLINT
#include <sstream>
#include <string>
zhanyong.wan's avatar
zhanyong.wan committed
48
#include <utility>
49
50
#include <vector>

51
52
53
#include "gmock/internal/gmock-internal-utils.h"
#include "gmock/internal/gmock-port.h"
#include "gtest/gtest.h"
54

55
56
57
58
#if GTEST_LANG_CXX11
#include <initializer_list>  // NOLINT -- must be after gtest.h
#endif

59
60
61
62
63
64
65
66
67
68
69
70
71
72
namespace testing {

// To implement a matcher Foo for type T, define:
//   1. a class FooMatcherImpl that implements the
//      MatcherInterface<T> interface, and
//   2. a factory function that creates a Matcher<T> object from a
//      FooMatcherImpl*.
//
// The two-level delegation design makes it possible to allow a user
// to write "v" instead of "Eq(v)" where a Matcher is expected, which
// is impossible if we pass matchers by pointers.  It also eases
// ownership management as Matcher objects can now be copied like
// plain values.

zhanyong.wan's avatar
zhanyong.wan committed
73
74
75
76
77
78
79
80
81
82
// MatchResultListener is an abstract class.  Its << operator can be
// used by a matcher to explain why a value matches or doesn't match.
//
// TODO(wan@google.com): add method
//   bool InterestedInWhy(bool result) const;
// to indicate whether the listener is interested in why the match
// result is 'result'.
class MatchResultListener {
 public:
  // Creates a listener object with the given underlying ostream.  The
83
84
  // listener does not own the ostream, and does not dereference it
  // in the constructor or destructor.
zhanyong.wan's avatar
zhanyong.wan committed
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
  explicit MatchResultListener(::std::ostream* os) : stream_(os) {}
  virtual ~MatchResultListener() = 0;  // Makes this class abstract.

  // Streams x to the underlying ostream; does nothing if the ostream
  // is NULL.
  template <typename T>
  MatchResultListener& operator<<(const T& x) {
    if (stream_ != NULL)
      *stream_ << x;
    return *this;
  }

  // Returns the underlying ostream.
  ::std::ostream* stream() { return stream_; }

100
101
102
103
104
105
  // Returns true iff the listener is interested in an explanation of
  // the match result.  A matcher's MatchAndExplain() method can use
  // this information to avoid generating the explanation when no one
  // intends to hear it.
  bool IsInterested() const { return stream_ != NULL; }

zhanyong.wan's avatar
zhanyong.wan committed
106
107
108
109
110
111
112
113
114
 private:
  ::std::ostream* const stream_;

  GTEST_DISALLOW_COPY_AND_ASSIGN_(MatchResultListener);
};

inline MatchResultListener::~MatchResultListener() {
}

115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
// An instance of a subclass of this knows how to describe itself as a
// matcher.
class MatcherDescriberInterface {
 public:
  virtual ~MatcherDescriberInterface() {}

  // Describes this matcher to an ostream.  The function should print
  // a verb phrase that describes the property a value matching this
  // matcher should have.  The subject of the verb phrase is the value
  // being matched.  For example, the DescribeTo() method of the Gt(7)
  // matcher prints "is greater than 7".
  virtual void DescribeTo(::std::ostream* os) const = 0;

  // Describes the negation of this matcher to an ostream.  For
  // example, if the description of this matcher is "is greater than
  // 7", the negated description could be "is not greater than 7".
  // You are not required to override this when implementing
  // MatcherInterface, but it is highly advised so that your matcher
  // can produce good error messages.
  virtual void DescribeNegationTo(::std::ostream* os) const {
    *os << "not (";
    DescribeTo(os);
    *os << ")";
  }
};

141
142
// The implementation of a matcher.
template <typename T>
143
class MatcherInterface : public MatcherDescriberInterface {
144
 public:
zhanyong.wan's avatar
zhanyong.wan committed
145
  // Returns true iff the matcher matches x; also explains the match
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
  // result to 'listener' if necessary (see the next paragraph), in
  // the form of a non-restrictive relative clause ("which ...",
  // "whose ...", etc) that describes x.  For example, the
  // MatchAndExplain() method of the Pointee(...) matcher should
  // generate an explanation like "which points to ...".
  //
  // Implementations of MatchAndExplain() should add an explanation of
  // the match result *if and only if* they can provide additional
  // information that's not already present (or not obvious) in the
  // print-out of x and the matcher's description.  Whether the match
  // succeeds is not a factor in deciding whether an explanation is
  // needed, as sometimes the caller needs to print a failure message
  // when the match succeeds (e.g. when the matcher is used inside
  // Not()).
  //
  // For example, a "has at least 10 elements" matcher should explain
  // what the actual element count is, regardless of the match result,
  // as it is useful information to the reader; on the other hand, an
  // "is empty" matcher probably only needs to explain what the actual
  // size is when the match fails, as it's redundant to say that the
  // size is 0 when the value is already known to be empty.
zhanyong.wan's avatar
zhanyong.wan committed
167
  //
168
  // You should override this method when defining a new matcher.
zhanyong.wan's avatar
zhanyong.wan committed
169
170
171
172
173
174
175
  //
  // It's the responsibility of the caller (Google Mock) to guarantee
  // that 'listener' is not NULL.  This helps to simplify a matcher's
  // implementation when it doesn't care about the performance, as it
  // can talk to 'listener' without checking its validity first.
  // However, in order to implement dummy listeners efficiently,
  // listener->stream() may be NULL.
176
  virtual bool MatchAndExplain(T x, MatchResultListener* listener) const = 0;
177

178
179
180
  // Inherits these methods from MatcherDescriberInterface:
  //   virtual void DescribeTo(::std::ostream* os) const = 0;
  //   virtual void DescribeNegationTo(::std::ostream* os) const;
181
182
};

183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
// A match result listener that stores the explanation in a string.
class StringMatchResultListener : public MatchResultListener {
 public:
  StringMatchResultListener() : MatchResultListener(&ss_) {}

  // Returns the explanation accumulated so far.
  internal::string str() const { return ss_.str(); }

  // Clears the explanation accumulated so far.
  void Clear() { ss_.str(""); }

 private:
  ::std::stringstream ss_;

  GTEST_DISALLOW_COPY_AND_ASSIGN_(StringMatchResultListener);
};

200
201
namespace internal {

zhanyong.wan's avatar
zhanyong.wan committed
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
// A match result listener that ignores the explanation.
class DummyMatchResultListener : public MatchResultListener {
 public:
  DummyMatchResultListener() : MatchResultListener(NULL) {}

 private:
  GTEST_DISALLOW_COPY_AND_ASSIGN_(DummyMatchResultListener);
};

// A match result listener that forwards the explanation to a given
// ostream.  The difference between this and MatchResultListener is
// that the former is concrete.
class StreamMatchResultListener : public MatchResultListener {
 public:
  explicit StreamMatchResultListener(::std::ostream* os)
      : MatchResultListener(os) {}

 private:
  GTEST_DISALLOW_COPY_AND_ASSIGN_(StreamMatchResultListener);
};

223
224
225
226
227
228
// An internal class for implementing Matcher<T>, which will derive
// from it.  We put functionalities common to all Matcher<T>
// specializations here to avoid code duplication.
template <typename T>
class MatcherBase {
 public:
zhanyong.wan's avatar
zhanyong.wan committed
229
230
231
232
233
234
  // Returns true iff the matcher matches x; also explains the match
  // result to 'listener'.
  bool MatchAndExplain(T x, MatchResultListener* listener) const {
    return impl_->MatchAndExplain(x, listener);
  }

235
  // Returns true iff this matcher matches x.
zhanyong.wan's avatar
zhanyong.wan committed
236
237
238
239
  bool Matches(T x) const {
    DummyMatchResultListener dummy;
    return MatchAndExplain(x, &dummy);
  }
240
241
242
243
244
245
246
247
248
249
250

  // Describes this matcher to an ostream.
  void DescribeTo(::std::ostream* os) const { impl_->DescribeTo(os); }

  // Describes the negation of this matcher to an ostream.
  void DescribeNegationTo(::std::ostream* os) const {
    impl_->DescribeNegationTo(os);
  }

  // Explains why x matches, or doesn't match, the matcher.
  void ExplainMatchResultTo(T x, ::std::ostream* os) const {
zhanyong.wan's avatar
zhanyong.wan committed
251
252
    StreamMatchResultListener listener(os);
    MatchAndExplain(x, &listener);
253
  }
254

255
256
257
258
259
260
261
  // Returns the describer for this matcher object; retains ownership
  // of the describer, which is only guaranteed to be alive when
  // this matcher object is alive.
  const MatcherDescriberInterface* GetDescriber() const {
    return impl_.get();
  }

262
263
264
265
266
267
268
269
 protected:
  MatcherBase() {}

  // Constructs a matcher from its implementation.
  explicit MatcherBase(const MatcherInterface<T>* impl)
      : impl_(impl) {}

  virtual ~MatcherBase() {}
270

271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
 private:
  // shared_ptr (util/gtl/shared_ptr.h) and linked_ptr have similar
  // interfaces.  The former dynamically allocates a chunk of memory
  // to hold the reference count, while the latter tracks all
  // references using a circular linked list without allocating
  // memory.  It has been observed that linked_ptr performs better in
  // typical scenarios.  However, shared_ptr can out-perform
  // linked_ptr when there are many more uses of the copy constructor
  // than the default constructor.
  //
  // If performance becomes a problem, we should see if using
  // shared_ptr helps.
  ::testing::internal::linked_ptr<const MatcherInterface<T> > impl_;
};

}  // namespace internal

// A Matcher<T> is a copyable and IMMUTABLE (except by assignment)
// object that can check whether a value of type T matches.  The
// implementation of Matcher<T> is just a linked_ptr to const
// MatcherInterface<T>, so copying is fairly cheap.  Don't inherit
// from Matcher!
template <typename T>
class Matcher : public internal::MatcherBase<T> {
 public:
296
297
298
  // Constructs a null matcher.  Needed for storing Matcher objects in STL
  // containers.  A default-constructed matcher is not yet initialized.  You
  // cannot use it until a valid value has been assigned to it.
299
300
301
302
303
304
  Matcher() {}

  // Constructs a matcher from its implementation.
  explicit Matcher(const MatcherInterface<T>* impl)
      : internal::MatcherBase<T>(impl) {}

305
  // Implicit constructor here allows people to write
306
307
308
309
310
311
312
313
  // EXPECT_CALL(foo, Bar(5)) instead of EXPECT_CALL(foo, Bar(Eq(5))) sometimes
  Matcher(T value);  // NOLINT
};

// The following two specializations allow the user to write str
// instead of Eq(str) and "foo" instead of Eq("foo") when a string
// matcher is expected.
template <>
314
class GTEST_API_ Matcher<const internal::string&>
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
    : public internal::MatcherBase<const internal::string&> {
 public:
  Matcher() {}

  explicit Matcher(const MatcherInterface<const internal::string&>* impl)
      : internal::MatcherBase<const internal::string&>(impl) {}

  // Allows the user to write str instead of Eq(str) sometimes, where
  // str is a string object.
  Matcher(const internal::string& s);  // NOLINT

  // Allows the user to write "foo" instead of Eq("foo") sometimes.
  Matcher(const char* s);  // NOLINT
};

template <>
331
class GTEST_API_ Matcher<internal::string>
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
    : public internal::MatcherBase<internal::string> {
 public:
  Matcher() {}

  explicit Matcher(const MatcherInterface<internal::string>* impl)
      : internal::MatcherBase<internal::string>(impl) {}

  // Allows the user to write str instead of Eq(str) sometimes, where
  // str is a string object.
  Matcher(const internal::string& s);  // NOLINT

  // Allows the user to write "foo" instead of Eq("foo") sometimes.
  Matcher(const char* s);  // NOLINT
};

347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
#if GTEST_HAS_STRING_PIECE_
// The following two specializations allow the user to write str
// instead of Eq(str) and "foo" instead of Eq("foo") when a StringPiece
// matcher is expected.
template <>
class GTEST_API_ Matcher<const StringPiece&>
    : public internal::MatcherBase<const StringPiece&> {
 public:
  Matcher() {}

  explicit Matcher(const MatcherInterface<const StringPiece&>* impl)
      : internal::MatcherBase<const StringPiece&>(impl) {}

  // Allows the user to write str instead of Eq(str) sometimes, where
  // str is a string object.
  Matcher(const internal::string& s);  // NOLINT

  // Allows the user to write "foo" instead of Eq("foo") sometimes.
  Matcher(const char* s);  // NOLINT

  // Allows the user to pass StringPieces directly.
  Matcher(StringPiece s);  // NOLINT
};

template <>
class GTEST_API_ Matcher<StringPiece>
    : public internal::MatcherBase<StringPiece> {
 public:
  Matcher() {}

  explicit Matcher(const MatcherInterface<StringPiece>* impl)
      : internal::MatcherBase<StringPiece>(impl) {}

  // Allows the user to write str instead of Eq(str) sometimes, where
  // str is a string object.
  Matcher(const internal::string& s);  // NOLINT

  // Allows the user to write "foo" instead of Eq("foo") sometimes.
  Matcher(const char* s);  // NOLINT

  // Allows the user to pass StringPieces directly.
  Matcher(StringPiece s);  // NOLINT
};
#endif  // GTEST_HAS_STRING_PIECE_

392
393
394
395
// The PolymorphicMatcher class template makes it easy to implement a
// polymorphic matcher (i.e. a matcher that can match values of more
// than one type, e.g. Eq(n) and NotNull()).
//
396
397
398
// To define a polymorphic matcher, a user should provide an Impl
// class that has a DescribeTo() method and a DescribeNegationTo()
// method, and define a member function (or member function template)
zhanyong.wan's avatar
zhanyong.wan committed
399
//
400
401
//   bool MatchAndExplain(const Value& value,
//                        MatchResultListener* listener) const;
zhanyong.wan's avatar
zhanyong.wan committed
402
403
//
// See the definition of NotNull() for a complete example.
404
405
406
template <class Impl>
class PolymorphicMatcher {
 public:
407
  explicit PolymorphicMatcher(const Impl& an_impl) : impl_(an_impl) {}
408

409
410
411
412
413
414
415
416
  // Returns a mutable reference to the underlying matcher
  // implementation object.
  Impl& mutable_impl() { return impl_; }

  // Returns an immutable reference to the underlying matcher
  // implementation object.
  const Impl& impl() const { return impl_; }

417
418
419
420
  template <typename T>
  operator Matcher<T>() const {
    return Matcher<T>(new MonomorphicImpl<T>(impl_));
  }
421

422
423
424
425
426
427
428
429
430
431
432
433
434
435
 private:
  template <typename T>
  class MonomorphicImpl : public MatcherInterface<T> {
   public:
    explicit MonomorphicImpl(const Impl& impl) : impl_(impl) {}

    virtual void DescribeTo(::std::ostream* os) const {
      impl_.DescribeTo(os);
    }

    virtual void DescribeNegationTo(::std::ostream* os) const {
      impl_.DescribeNegationTo(os);
    }

zhanyong.wan's avatar
zhanyong.wan committed
436
    virtual bool MatchAndExplain(T x, MatchResultListener* listener) const {
437
      return impl_.MatchAndExplain(x, listener);
438
    }
439

440
441
   private:
    const Impl impl_;
442
443

    GTEST_DISALLOW_ASSIGN_(MonomorphicImpl);
444
445
  };

446
  Impl impl_;
447
448

  GTEST_DISALLOW_ASSIGN_(PolymorphicMatcher);
449
450
451
452
453
454
455
456
457
458
459
460
};

// Creates a matcher from its implementation.  This is easier to use
// than the Matcher<T> constructor as it doesn't require you to
// explicitly write the template argument, e.g.
//
//   MakeMatcher(foo);
// vs
//   Matcher<const string&>(foo);
template <typename T>
inline Matcher<T> MakeMatcher(const MatcherInterface<T>* impl) {
  return Matcher<T>(impl);
461
}
462
463
464
465
466
467
468
469
470
471
472
473
474

// Creates a polymorphic matcher from its implementation.  This is
// easier to use than the PolymorphicMatcher<Impl> constructor as it
// doesn't require you to explicitly write the template argument, e.g.
//
//   MakePolymorphicMatcher(foo);
// vs
//   PolymorphicMatcher<TypeOfFoo>(foo);
template <class Impl>
inline PolymorphicMatcher<Impl> MakePolymorphicMatcher(const Impl& impl) {
  return PolymorphicMatcher<Impl>(impl);
}

475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
// Anything inside the 'internal' namespace IS INTERNAL IMPLEMENTATION
// and MUST NOT BE USED IN USER CODE!!!
namespace internal {

// The MatcherCastImpl class template is a helper for implementing
// MatcherCast().  We need this helper in order to partially
// specialize the implementation of MatcherCast() (C++ allows
// class/struct templates to be partially specialized, but not
// function templates.).

// This general version is used when MatcherCast()'s argument is a
// polymorphic matcher (i.e. something that can be converted to a
// Matcher but is not one yet; for example, Eq(value)) or a value (for
// example, "hello").
template <typename T, typename M>
class MatcherCastImpl {
 public:
492
  static Matcher<T> Cast(const M& polymorphic_matcher_or_value) {
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
    // M can be a polymorhic matcher, in which case we want to use
    // its conversion operator to create Matcher<T>.  Or it can be a value
    // that should be passed to the Matcher<T>'s constructor.
    //
    // We can't call Matcher<T>(polymorphic_matcher_or_value) when M is a
    // polymorphic matcher because it'll be ambiguous if T has an implicit
    // constructor from M (this usually happens when T has an implicit
    // constructor from any type).
    //
    // It won't work to unconditionally implict_cast
    // polymorphic_matcher_or_value to Matcher<T> because it won't trigger
    // a user-defined conversion from M to T if one exists (assuming M is
    // a value).
    return CastImpl(
        polymorphic_matcher_or_value,
        BooleanConstant<
            internal::ImplicitlyConvertible<M, Matcher<T> >::value>());
  }

 private:
513
  static Matcher<T> CastImpl(const M& value, BooleanConstant<false>) {
514
515
516
517
518
519
    // M can't be implicitly converted to Matcher<T>, so M isn't a polymorphic
    // matcher.  It must be a value then.  Use direct initialization to create
    // a matcher.
    return Matcher<T>(ImplicitCast_<T>(value));
  }

520
  static Matcher<T> CastImpl(const M& polymorphic_matcher_or_value,
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
                             BooleanConstant<true>) {
    // M is implicitly convertible to Matcher<T>, which means that either
    // M is a polymorhpic matcher or Matcher<T> has an implicit constructor
    // from M.  In both cases using the implicit conversion will produce a
    // matcher.
    //
    // Even if T has an implicit constructor from M, it won't be called because
    // creating Matcher<T> would require a chain of two user-defined conversions
    // (first to create T from M and then to create Matcher<T> from T).
    return polymorphic_matcher_or_value;
  }
};

// This more specialized version is used when MatcherCast()'s argument
// is already a Matcher.  This only compiles when type T can be
// statically converted to type U.
template <typename T, typename U>
class MatcherCastImpl<T, Matcher<U> > {
 public:
  static Matcher<T> Cast(const Matcher<U>& source_matcher) {
    return Matcher<T>(new Impl(source_matcher));
  }

 private:
  class Impl : public MatcherInterface<T> {
   public:
    explicit Impl(const Matcher<U>& source_matcher)
        : source_matcher_(source_matcher) {}

    // We delegate the matching logic to the source matcher.
    virtual bool MatchAndExplain(T x, MatchResultListener* listener) const {
      return source_matcher_.MatchAndExplain(static_cast<U>(x), listener);
    }

    virtual void DescribeTo(::std::ostream* os) const {
      source_matcher_.DescribeTo(os);
    }

    virtual void DescribeNegationTo(::std::ostream* os) const {
      source_matcher_.DescribeNegationTo(os);
    }

   private:
    const Matcher<U> source_matcher_;

    GTEST_DISALLOW_ASSIGN_(Impl);
  };
};

// This even more specialized version is used for efficiently casting
// a matcher to its own type.
template <typename T>
class MatcherCastImpl<T, Matcher<T> > {
 public:
  static Matcher<T> Cast(const Matcher<T>& matcher) { return matcher; }
};

}  // namespace internal

580
581
582
583
584
// In order to be safe and clear, casting between different matcher
// types is done explicitly via MatcherCast<T>(m), which takes a
// matcher m and returns a Matcher<T>.  It compiles only when T can be
// statically converted to the argument type of m.
template <typename T, typename M>
585
inline Matcher<T> MatcherCast(const M& matcher) {
586
587
  return internal::MatcherCastImpl<T, M>::Cast(matcher);
}
588

589
590
// Implements SafeMatcherCast().
//
591
592
593
594
595
596
597
598
// We use an intermediate class to do the actual safe casting as Nokia's
// Symbian compiler cannot decide between
// template <T, M> ... (M) and
// template <T, U> ... (const Matcher<U>&)
// for function templates but can for member function templates.
template <typename T>
class SafeMatcherCastImpl {
 public:
599
600
  // This overload handles polymorphic matchers and values only since
  // monomorphic matchers are handled by the next one.
601
  template <typename M>
602
  static inline Matcher<T> Cast(const M& polymorphic_matcher_or_value) {
603
    return internal::MatcherCastImpl<T, M>::Cast(polymorphic_matcher_or_value);
604
  }
605

606
607
608
609
610
611
612
613
614
615
616
617
  // This overload handles monomorphic matchers.
  //
  // In general, if type T can be implicitly converted to type U, we can
  // safely convert a Matcher<U> to a Matcher<T> (i.e. Matcher is
  // contravariant): just keep a copy of the original Matcher<U>, convert the
  // argument from type T to U, and then pass it to the underlying Matcher<U>.
  // The only exception is when U is a reference and T is not, as the
  // underlying Matcher<U> may be interested in the argument's address, which
  // is not preserved in the conversion from T to U.
  template <typename U>
  static inline Matcher<T> Cast(const Matcher<U>& matcher) {
    // Enforce that T can be implicitly converted to U.
618
    GTEST_COMPILE_ASSERT_((internal::ImplicitlyConvertible<T, U>::value),
619
620
621
                          T_must_be_implicitly_convertible_to_U);
    // Enforce that we are not converting a non-reference type T to a reference
    // type U.
622
    GTEST_COMPILE_ASSERT_(
623
624
625
626
        internal::is_reference<T>::value || !internal::is_reference<U>::value,
        cannot_convert_non_referentce_arg_to_reference);
    // In case both T and U are arithmetic types, enforce that the
    // conversion is not lossy.
zhanyong.wan's avatar
zhanyong.wan committed
627
628
    typedef GTEST_REMOVE_REFERENCE_AND_CONST_(T) RawT;
    typedef GTEST_REMOVE_REFERENCE_AND_CONST_(U) RawU;
629
630
    const bool kTIsOther = GMOCK_KIND_OF_(RawT) == internal::kOther;
    const bool kUIsOther = GMOCK_KIND_OF_(RawU) == internal::kOther;
631
    GTEST_COMPILE_ASSERT_(
632
633
634
635
636
637
638
639
640
641
        kTIsOther || kUIsOther ||
        (internal::LosslessArithmeticConvertible<RawT, RawU>::value),
        conversion_of_arithmetic_types_must_be_lossless);
    return MatcherCast<T>(matcher);
  }
};

template <typename T, typename M>
inline Matcher<T> SafeMatcherCast(const M& polymorphic_matcher) {
  return SafeMatcherCastImpl<T>::Cast(polymorphic_matcher);
642
643
}

644
645
646
647
648
649
650
651
// A<T>() returns a matcher that matches any value of type T.
template <typename T>
Matcher<T> A();

// Anything inside the 'internal' namespace IS INTERNAL IMPLEMENTATION
// and MUST NOT BE USED IN USER CODE!!!
namespace internal {

652
653
// If the explanation is not empty, prints it to the ostream.
inline void PrintIfNotEmpty(const internal::string& explanation,
654
                            ::std::ostream* os) {
655
656
  if (explanation != "" && os != NULL) {
    *os << ", " << explanation;
657
658
659
  }
}

660
661
662
663
664
665
666
667
668
669
// Returns true if the given type name is easy to read by a human.
// This is used to decide whether printing the type of a value might
// be helpful.
inline bool IsReadableTypeName(const string& type_name) {
  // We consider a type name readable if it's short or doesn't contain
  // a template or function type.
  return (type_name.length() <= 20 ||
          type_name.find_first_of("<(") == string::npos);
}

670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
// Matches the value against the given matcher, prints the value and explains
// the match result to the listener. Returns the match result.
// 'listener' must not be NULL.
// Value cannot be passed by const reference, because some matchers take a
// non-const argument.
template <typename Value, typename T>
bool MatchPrintAndExplain(Value& value, const Matcher<T>& matcher,
                          MatchResultListener* listener) {
  if (!listener->IsInterested()) {
    // If the listener is not interested, we do not need to construct the
    // inner explanation.
    return matcher.Matches(value);
  }

  StringMatchResultListener inner_listener;
  const bool match = matcher.MatchAndExplain(value, &inner_listener);

  UniversalPrint(value, listener->stream());
688
689
690
691
692
#if GTEST_HAS_RTTI
  const string& type_name = GetTypeName<Value>();
  if (IsReadableTypeName(type_name))
    *listener->stream() << " (of type " << type_name << ")";
#endif
693
  PrintIfNotEmpty(inner_listener.str(), listener->stream());
694
695
696
697

  return match;
}

698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
// An internal helper class for doing compile-time loop on a tuple's
// fields.
template <size_t N>
class TuplePrefix {
 public:
  // TuplePrefix<N>::Matches(matcher_tuple, value_tuple) returns true
  // iff the first N fields of matcher_tuple matches the first N
  // fields of value_tuple, respectively.
  template <typename MatcherTuple, typename ValueTuple>
  static bool Matches(const MatcherTuple& matcher_tuple,
                      const ValueTuple& value_tuple) {
    using ::std::tr1::get;
    return TuplePrefix<N - 1>::Matches(matcher_tuple, value_tuple)
        && get<N - 1>(matcher_tuple).Matches(get<N - 1>(value_tuple));
  }

714
  // TuplePrefix<N>::ExplainMatchFailuresTo(matchers, values, os)
715
716
717
718
  // describes failures in matching the first N fields of matchers
  // against the first N fields of values.  If there is no failure,
  // nothing will be streamed to os.
  template <typename MatcherTuple, typename ValueTuple>
719
720
721
  static void ExplainMatchFailuresTo(const MatcherTuple& matchers,
                                     const ValueTuple& values,
                                     ::std::ostream* os) {
722
723
724
725
    using ::std::tr1::tuple_element;
    using ::std::tr1::get;

    // First, describes failures in the first N - 1 fields.
726
    TuplePrefix<N - 1>::ExplainMatchFailuresTo(matchers, values, os);
727
728
729
730
731
732
733

    // Then describes the failure (if any) in the (N - 1)-th (0-based)
    // field.
    typename tuple_element<N - 1, MatcherTuple>::type matcher =
        get<N - 1>(matchers);
    typedef typename tuple_element<N - 1, ValueTuple>::type Value;
    Value value = get<N - 1>(values);
zhanyong.wan's avatar
zhanyong.wan committed
734
735
    StringMatchResultListener listener;
    if (!matcher.MatchAndExplain(value, &listener)) {
736
737
738
739
740
741
742
743
      // TODO(wan): include in the message the name of the parameter
      // as used in MOCK_METHOD*() when possible.
      *os << "  Expected arg #" << N - 1 << ": ";
      get<N - 1>(matchers).DescribeTo(os);
      *os << "\n           Actual: ";
      // We remove the reference in type Value to prevent the
      // universal printer from printing the address of value, which
      // isn't interesting to the user most of the time.  The
744
      // matcher's MatchAndExplain() method handles the case when
745
      // the address is interesting.
746
747
      internal::UniversalPrint(value, os);
      PrintIfNotEmpty(listener.str(), os);
748
749
750
751
752
753
754
755
756
757
      *os << "\n";
    }
  }
};

// The base case.
template <>
class TuplePrefix<0> {
 public:
  template <typename MatcherTuple, typename ValueTuple>
758
759
  static bool Matches(const MatcherTuple& /* matcher_tuple */,
                      const ValueTuple& /* value_tuple */) {
760
761
762
763
    return true;
  }

  template <typename MatcherTuple, typename ValueTuple>
764
765
766
  static void ExplainMatchFailuresTo(const MatcherTuple& /* matchers */,
                                     const ValueTuple& /* values */,
                                     ::std::ostream* /* os */) {}
767
768
769
770
771
772
773
774
775
776
777
778
779
};

// TupleMatches(matcher_tuple, value_tuple) returns true iff all
// matchers in matcher_tuple match the corresponding fields in
// value_tuple.  It is a compiler error if matcher_tuple and
// value_tuple have different number of fields or incompatible field
// types.
template <typename MatcherTuple, typename ValueTuple>
bool TupleMatches(const MatcherTuple& matcher_tuple,
                  const ValueTuple& value_tuple) {
  using ::std::tr1::tuple_size;
  // Makes sure that matcher_tuple and value_tuple have the same
  // number of fields.
780
  GTEST_COMPILE_ASSERT_(tuple_size<MatcherTuple>::value ==
781
782
                        tuple_size<ValueTuple>::value,
                        matcher_and_value_have_different_numbers_of_fields);
783
784
785
786
787
788
789
  return TuplePrefix<tuple_size<ValueTuple>::value>::
      Matches(matcher_tuple, value_tuple);
}

// Describes failures in matching matchers against values.  If there
// is no failure, nothing will be streamed to os.
template <typename MatcherTuple, typename ValueTuple>
790
791
792
void ExplainMatchFailureTupleTo(const MatcherTuple& matchers,
                                const ValueTuple& values,
                                ::std::ostream* os) {
793
  using ::std::tr1::tuple_size;
794
  TuplePrefix<tuple_size<MatcherTuple>::value>::ExplainMatchFailuresTo(
795
796
797
      matchers, values, os);
}

798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
// TransformTupleValues and its helper.
//
// TransformTupleValuesHelper hides the internal machinery that
// TransformTupleValues uses to implement a tuple traversal.
template <typename Tuple, typename Func, typename OutIter>
class TransformTupleValuesHelper {
 private:
  typedef typename ::std::tr1::tuple_size<Tuple> TupleSize;

 public:
  // For each member of tuple 't', taken in order, evaluates '*out++ = f(t)'.
  // Returns the final value of 'out' in case the caller needs it.
  static OutIter Run(Func f, const Tuple& t, OutIter out) {
    return IterateOverTuple<Tuple, TupleSize::value>()(f, t, out);
  }

 private:
  template <typename Tup, size_t kRemainingSize>
  struct IterateOverTuple {
    OutIter operator() (Func f, const Tup& t, OutIter out) const {
      *out++ = f(::std::tr1::get<TupleSize::value - kRemainingSize>(t));
      return IterateOverTuple<Tup, kRemainingSize - 1>()(f, t, out);
    }
  };
  template <typename Tup>
  struct IterateOverTuple<Tup, 0> {
    OutIter operator() (Func /* f */, const Tup& /* t */, OutIter out) const {
      return out;
    }
  };
};

// Successively invokes 'f(element)' on each element of the tuple 't',
// appending each result to the 'out' iterator. Returns the final value
// of 'out'.
template <typename Tuple, typename Func, typename OutIter>
OutIter TransformTupleValues(Func f, const Tuple& t, OutIter out) {
  return TransformTupleValuesHelper<Tuple, Func, OutIter>::Run(f, t, out);
}

838
839
840
841
// Implements A<T>().
template <typename T>
class AnyMatcherImpl : public MatcherInterface<T> {
 public:
zhanyong.wan's avatar
zhanyong.wan committed
842
843
  virtual bool MatchAndExplain(
      T /* x */, MatchResultListener* /* listener */) const { return true; }
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
  virtual void DescribeTo(::std::ostream* os) const { *os << "is anything"; }
  virtual void DescribeNegationTo(::std::ostream* os) const {
    // This is mostly for completeness' safe, as it's not very useful
    // to write Not(A<bool>()).  However we cannot completely rule out
    // such a possibility, and it doesn't hurt to be prepared.
    *os << "never matches";
  }
};

// Implements _, a matcher that matches any value of any
// type.  This is a polymorphic matcher, so we need a template type
// conversion operator to make it appearing as a Matcher<T> for any
// type T.
class AnythingMatcher {
 public:
  template <typename T>
  operator Matcher<T>() const { return A<T>(); }
};

// Implements a matcher that compares a given value with a
// pre-supplied value using one of the ==, <=, <, etc, operators.  The
// two values being compared don't have to have the same type.
//
// The matcher defined here is polymorphic (for example, Eq(5) can be
// used to match an int, a short, a double, etc).  Therefore we use
// a template type conversion operator in the implementation.
//
// We define this as a macro in order to eliminate duplicated source
// code.
//
// The following template definition assumes that the Rhs parameter is
// a "bare" type (i.e. neither 'const T' nor 'T&').
876
877
#define GMOCK_IMPLEMENT_COMPARISON_MATCHER_( \
    name, op, relation, negated_relation) \
878
879
880
881
882
883
884
885
886
887
888
889
  template <typename Rhs> class name##Matcher { \
   public: \
    explicit name##Matcher(const Rhs& rhs) : rhs_(rhs) {} \
    template <typename Lhs> \
    operator Matcher<Lhs>() const { \
      return MakeMatcher(new Impl<Lhs>(rhs_)); \
    } \
   private: \
    template <typename Lhs> \
    class Impl : public MatcherInterface<Lhs> { \
     public: \
      explicit Impl(const Rhs& rhs) : rhs_(rhs) {} \
zhanyong.wan's avatar
zhanyong.wan committed
890
891
892
893
      virtual bool MatchAndExplain(\
          Lhs lhs, MatchResultListener* /* listener */) const { \
        return lhs op rhs_; \
      } \
894
      virtual void DescribeTo(::std::ostream* os) const { \
895
        *os << relation  " "; \
vladlosev's avatar
vladlosev committed
896
        UniversalPrint(rhs_, os); \
897
898
      } \
      virtual void DescribeNegationTo(::std::ostream* os) const { \
899
        *os << negated_relation  " "; \
vladlosev's avatar
vladlosev committed
900
        UniversalPrint(rhs_, os); \
901
902
903
      } \
     private: \
      Rhs rhs_; \
904
      GTEST_DISALLOW_ASSIGN_(Impl); \
905
906
    }; \
    Rhs rhs_; \
907
    GTEST_DISALLOW_ASSIGN_(name##Matcher); \
908
909
910
911
  }

// Implements Eq(v), Ge(v), Gt(v), Le(v), Lt(v), and Ne(v)
// respectively.
912
913
914
915
916
917
GMOCK_IMPLEMENT_COMPARISON_MATCHER_(Eq, ==, "is equal to", "isn't equal to");
GMOCK_IMPLEMENT_COMPARISON_MATCHER_(Ge, >=, "is >=", "isn't >=");
GMOCK_IMPLEMENT_COMPARISON_MATCHER_(Gt, >, "is >", "isn't >");
GMOCK_IMPLEMENT_COMPARISON_MATCHER_(Le, <=, "is <=", "isn't <=");
GMOCK_IMPLEMENT_COMPARISON_MATCHER_(Lt, <, "is <", "isn't <");
GMOCK_IMPLEMENT_COMPARISON_MATCHER_(Ne, !=, "isn't equal to", "is equal to");
918

919
#undef GMOCK_IMPLEMENT_COMPARISON_MATCHER_
920

921
// Implements the polymorphic IsNull() matcher, which matches any raw or smart
zhanyong.wan's avatar
zhanyong.wan committed
922
923
924
// pointer that is NULL.
class IsNullMatcher {
 public:
925
  template <typename Pointer>
926
927
928
929
  bool MatchAndExplain(const Pointer& p,
                       MatchResultListener* /* listener */) const {
    return GetRawPointer(p) == NULL;
  }
zhanyong.wan's avatar
zhanyong.wan committed
930
931
932

  void DescribeTo(::std::ostream* os) const { *os << "is NULL"; }
  void DescribeNegationTo(::std::ostream* os) const {
933
    *os << "isn't NULL";
zhanyong.wan's avatar
zhanyong.wan committed
934
935
936
  }
};

937
// Implements the polymorphic NotNull() matcher, which matches any raw or smart
938
939
940
// pointer that is not NULL.
class NotNullMatcher {
 public:
941
  template <typename Pointer>
942
943
944
945
  bool MatchAndExplain(const Pointer& p,
                       MatchResultListener* /* listener */) const {
    return GetRawPointer(p) != NULL;
  }
946

947
  void DescribeTo(::std::ostream* os) const { *os << "isn't NULL"; }
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
  void DescribeNegationTo(::std::ostream* os) const {
    *os << "is NULL";
  }
};

// Ref(variable) matches any argument that is a reference to
// 'variable'.  This matcher is polymorphic as it can match any
// super type of the type of 'variable'.
//
// The RefMatcher template class implements Ref(variable).  It can
// only be instantiated with a reference type.  This prevents a user
// from mistakenly using Ref(x) to match a non-reference function
// argument.  For example, the following will righteously cause a
// compiler error:
//
//   int n;
//   Matcher<int> m1 = Ref(n);   // This won't compile.
//   Matcher<int&> m2 = Ref(n);  // This will compile.
template <typename T>
class RefMatcher;

template <typename T>
class RefMatcher<T&> {
  // Google Mock is a generic framework and thus needs to support
  // mocking any function types, including those that take non-const
  // reference arguments.  Therefore the template parameter T (and
  // Super below) can be instantiated to either a const type or a
  // non-const type.
 public:
  // RefMatcher() takes a T& instead of const T&, as we want the
  // compiler to catch using Ref(const_value) as a matcher for a
  // non-const reference.
  explicit RefMatcher(T& x) : object_(x) {}  // NOLINT

  template <typename Super>
  operator Matcher<Super&>() const {
    // By passing object_ (type T&) to Impl(), which expects a Super&,
    // we make sure that Super is a super type of T.  In particular,
    // this catches using Ref(const_value) as a matcher for a
    // non-const reference, as you cannot implicitly convert a const
    // reference to a non-const reference.
    return MakeMatcher(new Impl<Super>(object_));
  }
991

992
993
994
995
996
997
 private:
  template <typename Super>
  class Impl : public MatcherInterface<Super&> {
   public:
    explicit Impl(Super& x) : object_(x) {}  // NOLINT

998
999
    // MatchAndExplain() takes a Super& (as opposed to const Super&)
    // in order to match the interface MatcherInterface<Super&>.
zhanyong.wan's avatar
zhanyong.wan committed
1000
1001
    virtual bool MatchAndExplain(
        Super& x, MatchResultListener* listener) const {
1002
      *listener << "which is located @" << static_cast<const void*>(&x);
zhanyong.wan's avatar
zhanyong.wan committed
1003
1004
      return &x == &object_;
    }
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017

    virtual void DescribeTo(::std::ostream* os) const {
      *os << "references the variable ";
      UniversalPrinter<Super&>::Print(object_, os);
    }

    virtual void DescribeNegationTo(::std::ostream* os) const {
      *os << "does not reference the variable ";
      UniversalPrinter<Super&>::Print(object_, os);
    }

   private:
    const Super& object_;
1018
1019

    GTEST_DISALLOW_ASSIGN_(Impl);
1020
1021
1022
  };

  T& object_;
1023
1024

  GTEST_DISALLOW_ASSIGN_(RefMatcher);
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
};

// Polymorphic helper functions for narrow and wide string matchers.
inline bool CaseInsensitiveCStringEquals(const char* lhs, const char* rhs) {
  return String::CaseInsensitiveCStringEquals(lhs, rhs);
}

inline bool CaseInsensitiveCStringEquals(const wchar_t* lhs,
                                         const wchar_t* rhs) {
  return String::CaseInsensitiveWideCStringEquals(lhs, rhs);
}

// String comparison for narrow or wide strings that can have embedded NUL
// characters.
template <typename StringType>
bool CaseInsensitiveStringEquals(const StringType& s1,
                                 const StringType& s2) {
  // Are the heads equal?
  if (!CaseInsensitiveCStringEquals(s1.c_str(), s2.c_str())) {
    return false;
  }

  // Skip the equal heads.
  const typename StringType::value_type nul = 0;
  const size_t i1 = s1.find(nul), i2 = s2.find(nul);

  // Are we at the end of either s1 or s2?
  if (i1 == StringType::npos || i2 == StringType::npos) {
    return i1 == i2;
  }

  // Are the tails equal?
  return CaseInsensitiveStringEquals(s1.substr(i1 + 1), s2.substr(i2 + 1));
}

// String matchers.

// Implements equality-based string matchers like StrEq, StrCaseNe, and etc.
template <typename StringType>
class StrEqualityMatcher {
 public:
  StrEqualityMatcher(const StringType& str, bool expect_eq,
                     bool case_sensitive)
      : string_(str), expect_eq_(expect_eq), case_sensitive_(case_sensitive) {}

1070
1071
1072
1073
1074
1075
1076
  // Accepts pointer types, particularly:
  //   const char*
  //   char*
  //   const wchar_t*
  //   wchar_t*
  template <typename CharType>
  bool MatchAndExplain(CharType* s, MatchResultListener* listener) const {
1077
1078
1079
    if (s == NULL) {
      return !expect_eq_;
    }
1080
    return MatchAndExplain(StringType(s), listener);
1081
1082
  }

1083
1084
1085
1086
1087
1088
  // Matches anything that can convert to StringType.
  //
  // This is a template, not just a plain function with const StringType&,
  // because StringPiece has some interfering non-explicit constructors.
  template <typename MatcheeStringType>
  bool MatchAndExplain(const MatcheeStringType& s,
1089
                       MatchResultListener* /* listener */) const {
1090
1091
1092
    const StringType& s2(s);
    const bool eq = case_sensitive_ ? s2 == string_ :
        CaseInsensitiveStringEquals(s2, string_);
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
    return expect_eq_ == eq;
  }

  void DescribeTo(::std::ostream* os) const {
    DescribeToHelper(expect_eq_, os);
  }

  void DescribeNegationTo(::std::ostream* os) const {
    DescribeToHelper(!expect_eq_, os);
  }
1103

1104
1105
 private:
  void DescribeToHelper(bool expect_eq, ::std::ostream* os) const {
1106
    *os << (expect_eq ? "is " : "isn't ");
1107
1108
1109
1110
    *os << "equal to ";
    if (!case_sensitive_) {
      *os << "(ignoring case) ";
    }
vladlosev's avatar
vladlosev committed
1111
    UniversalPrint(string_, os);
1112
1113
1114
1115
1116
  }

  const StringType string_;
  const bool expect_eq_;
  const bool case_sensitive_;
1117
1118

  GTEST_DISALLOW_ASSIGN_(StrEqualityMatcher);
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
};

// Implements the polymorphic HasSubstr(substring) matcher, which
// can be used as a Matcher<T> as long as T can be converted to a
// string.
template <typename StringType>
class HasSubstrMatcher {
 public:
  explicit HasSubstrMatcher(const StringType& substring)
      : substring_(substring) {}

1130
1131
1132
1133
1134
1135
1136
  // Accepts pointer types, particularly:
  //   const char*
  //   char*
  //   const wchar_t*
  //   wchar_t*
  template <typename CharType>
  bool MatchAndExplain(CharType* s, MatchResultListener* listener) const {
1137
    return s != NULL && MatchAndExplain(StringType(s), listener);
1138
1139
  }

1140
1141
1142
1143
1144
1145
  // Matches anything that can convert to StringType.
  //
  // This is a template, not just a plain function with const StringType&,
  // because StringPiece has some interfering non-explicit constructors.
  template <typename MatcheeStringType>
  bool MatchAndExplain(const MatcheeStringType& s,
1146
                       MatchResultListener* /* listener */) const {
1147
1148
    const StringType& s2(s);
    return s2.find(substring_) != StringType::npos;
1149
1150
1151
1152
1153
  }

  // Describes what this matcher matches.
  void DescribeTo(::std::ostream* os) const {
    *os << "has substring ";
vladlosev's avatar
vladlosev committed
1154
    UniversalPrint(substring_, os);
1155
1156
1157
1158
  }

  void DescribeNegationTo(::std::ostream* os) const {
    *os << "has no substring ";
vladlosev's avatar
vladlosev committed
1159
    UniversalPrint(substring_, os);
1160
  }
1161

1162
1163
 private:
  const StringType substring_;
1164
1165

  GTEST_DISALLOW_ASSIGN_(HasSubstrMatcher);
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
};

// Implements the polymorphic StartsWith(substring) matcher, which
// can be used as a Matcher<T> as long as T can be converted to a
// string.
template <typename StringType>
class StartsWithMatcher {
 public:
  explicit StartsWithMatcher(const StringType& prefix) : prefix_(prefix) {
  }

1177
1178
1179
1180
1181
1182
1183
  // Accepts pointer types, particularly:
  //   const char*
  //   char*
  //   const wchar_t*
  //   wchar_t*
  template <typename CharType>
  bool MatchAndExplain(CharType* s, MatchResultListener* listener) const {
1184
    return s != NULL && MatchAndExplain(StringType(s), listener);
1185
1186
  }

1187
1188
1189
1190
1191
1192
  // Matches anything that can convert to StringType.
  //
  // This is a template, not just a plain function with const StringType&,
  // because StringPiece has some interfering non-explicit constructors.
  template <typename MatcheeStringType>
  bool MatchAndExplain(const MatcheeStringType& s,
1193
                       MatchResultListener* /* listener */) const {
1194
1195
1196
    const StringType& s2(s);
    return s2.length() >= prefix_.length() &&
        s2.substr(0, prefix_.length()) == prefix_;
1197
1198
1199
1200
  }

  void DescribeTo(::std::ostream* os) const {
    *os << "starts with ";
vladlosev's avatar
vladlosev committed
1201
    UniversalPrint(prefix_, os);
1202
1203
1204
1205
  }

  void DescribeNegationTo(::std::ostream* os) const {
    *os << "doesn't start with ";
vladlosev's avatar
vladlosev committed
1206
    UniversalPrint(prefix_, os);
1207
  }
1208

1209
1210
 private:
  const StringType prefix_;
1211
1212

  GTEST_DISALLOW_ASSIGN_(StartsWithMatcher);
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
};

// Implements the polymorphic EndsWith(substring) matcher, which
// can be used as a Matcher<T> as long as T can be converted to a
// string.
template <typename StringType>
class EndsWithMatcher {
 public:
  explicit EndsWithMatcher(const StringType& suffix) : suffix_(suffix) {}

1223
1224
1225
1226
1227
1228
1229
  // Accepts pointer types, particularly:
  //   const char*
  //   char*
  //   const wchar_t*
  //   wchar_t*
  template <typename CharType>
  bool MatchAndExplain(CharType* s, MatchResultListener* listener) const {
1230
    return s != NULL && MatchAndExplain(StringType(s), listener);
1231
1232
  }

1233
1234
1235
1236
1237
1238
  // Matches anything that can convert to StringType.
  //
  // This is a template, not just a plain function with const StringType&,
  // because StringPiece has some interfering non-explicit constructors.
  template <typename MatcheeStringType>
  bool MatchAndExplain(const MatcheeStringType& s,
1239
                       MatchResultListener* /* listener */) const {
1240
1241
1242
    const StringType& s2(s);
    return s2.length() >= suffix_.length() &&
        s2.substr(s2.length() - suffix_.length()) == suffix_;
1243
1244
1245
1246
  }

  void DescribeTo(::std::ostream* os) const {
    *os << "ends with ";
vladlosev's avatar
vladlosev committed
1247
    UniversalPrint(suffix_, os);
1248
1249
1250
1251
  }

  void DescribeNegationTo(::std::ostream* os) const {
    *os << "doesn't end with ";
vladlosev's avatar
vladlosev committed
1252
    UniversalPrint(suffix_, os);
1253
  }
1254

1255
1256
 private:
  const StringType suffix_;
1257
1258

  GTEST_DISALLOW_ASSIGN_(EndsWithMatcher);
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
};

// Implements polymorphic matchers MatchesRegex(regex) and
// ContainsRegex(regex), which can be used as a Matcher<T> as long as
// T can be converted to a string.
class MatchesRegexMatcher {
 public:
  MatchesRegexMatcher(const RE* regex, bool full_match)
      : regex_(regex), full_match_(full_match) {}

1269
1270
1271
1272
1273
1274
1275
  // Accepts pointer types, particularly:
  //   const char*
  //   char*
  //   const wchar_t*
  //   wchar_t*
  template <typename CharType>
  bool MatchAndExplain(CharType* s, MatchResultListener* listener) const {
1276
    return s != NULL && MatchAndExplain(internal::string(s), listener);
1277
1278
  }

1279
1280
1281
1282
1283
1284
  // Matches anything that can convert to internal::string.
  //
  // This is a template, not just a plain function with const internal::string&,
  // because StringPiece has some interfering non-explicit constructors.
  template <class MatcheeStringType>
  bool MatchAndExplain(const MatcheeStringType& s,
1285
                       MatchResultListener* /* listener */) const {
1286
1287
1288
    const internal::string& s2(s);
    return full_match_ ? RE::FullMatch(s2, *regex_) :
        RE::PartialMatch(s2, *regex_);
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
  }

  void DescribeTo(::std::ostream* os) const {
    *os << (full_match_ ? "matches" : "contains")
        << " regular expression ";
    UniversalPrinter<internal::string>::Print(regex_->pattern(), os);
  }

  void DescribeNegationTo(::std::ostream* os) const {
    *os << "doesn't " << (full_match_ ? "match" : "contain")
        << " regular expression ";
    UniversalPrinter<internal::string>::Print(regex_->pattern(), os);
  }
1302

1303
1304
1305
 private:
  const internal::linked_ptr<const RE> regex_;
  const bool full_match_;
1306
1307

  GTEST_DISALLOW_ASSIGN_(MatchesRegexMatcher);
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
};

// Implements a matcher that compares the two fields of a 2-tuple
// using one of the ==, <=, <, etc, operators.  The two fields being
// compared don't have to have the same type.
//
// The matcher defined here is polymorphic (for example, Eq() can be
// used to match a tuple<int, short>, a tuple<const long&, double>,
// etc).  Therefore we use a template type conversion operator in the
// implementation.
//
// We define this as a macro in order to eliminate duplicated source
// code.
zhanyong.wan's avatar
zhanyong.wan committed
1321
#define GMOCK_IMPLEMENT_COMPARISON2_MATCHER_(name, op, relation) \
1322
1323
  class name##2Matcher { \
   public: \
zhanyong.wan's avatar
zhanyong.wan committed
1324
1325
1326
1327
    template <typename T1, typename T2> \
    operator Matcher< ::std::tr1::tuple<T1, T2> >() const { \
      return MakeMatcher(new Impl< ::std::tr1::tuple<T1, T2> >); \
    } \
1328
1329
    template <typename T1, typename T2> \
    operator Matcher<const ::std::tr1::tuple<T1, T2>&>() const { \
zhanyong.wan's avatar
zhanyong.wan committed
1330
      return MakeMatcher(new Impl<const ::std::tr1::tuple<T1, T2>&>); \
1331
1332
    } \
   private: \
zhanyong.wan's avatar
zhanyong.wan committed
1333
1334
    template <typename Tuple> \
    class Impl : public MatcherInterface<Tuple> { \
1335
     public: \
zhanyong.wan's avatar
zhanyong.wan committed
1336
      virtual bool MatchAndExplain( \
zhanyong.wan's avatar
zhanyong.wan committed
1337
          Tuple args, \
zhanyong.wan's avatar
zhanyong.wan committed
1338
          MatchResultListener* /* listener */) const { \
1339
1340
1341
        return ::std::tr1::get<0>(args) op ::std::tr1::get<1>(args); \
      } \
      virtual void DescribeTo(::std::ostream* os) const { \
zhanyong.wan's avatar
zhanyong.wan committed
1342
        *os << "are " relation;                                 \
1343
1344
      } \
      virtual void DescribeNegationTo(::std::ostream* os) const { \
zhanyong.wan's avatar
zhanyong.wan committed
1345
        *os << "aren't " relation; \
1346
1347
1348
1349
1350
      } \
    }; \
  }

// Implements Eq(), Ge(), Gt(), Le(), Lt(), and Ne() respectively.
zhanyong.wan's avatar
zhanyong.wan committed
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
GMOCK_IMPLEMENT_COMPARISON2_MATCHER_(Eq, ==, "an equal pair");
GMOCK_IMPLEMENT_COMPARISON2_MATCHER_(
    Ge, >=, "a pair where the first >= the second");
GMOCK_IMPLEMENT_COMPARISON2_MATCHER_(
    Gt, >, "a pair where the first > the second");
GMOCK_IMPLEMENT_COMPARISON2_MATCHER_(
    Le, <=, "a pair where the first <= the second");
GMOCK_IMPLEMENT_COMPARISON2_MATCHER_(
    Lt, <, "a pair where the first < the second");
GMOCK_IMPLEMENT_COMPARISON2_MATCHER_(Ne, !=, "an unequal pair");
1361

1362
#undef GMOCK_IMPLEMENT_COMPARISON2_MATCHER_
1363

1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
// Implements the Not(...) matcher for a particular argument type T.
// We do not nest it inside the NotMatcher class template, as that
// will prevent different instantiations of NotMatcher from sharing
// the same NotMatcherImpl<T> class.
template <typename T>
class NotMatcherImpl : public MatcherInterface<T> {
 public:
  explicit NotMatcherImpl(const Matcher<T>& matcher)
      : matcher_(matcher) {}

zhanyong.wan's avatar
zhanyong.wan committed
1374
1375
  virtual bool MatchAndExplain(T x, MatchResultListener* listener) const {
    return !matcher_.MatchAndExplain(x, listener);
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
  }

  virtual void DescribeTo(::std::ostream* os) const {
    matcher_.DescribeNegationTo(os);
  }

  virtual void DescribeNegationTo(::std::ostream* os) const {
    matcher_.DescribeTo(os);
  }

 private:
  const Matcher<T> matcher_;
1388
1389

  GTEST_DISALLOW_ASSIGN_(NotMatcherImpl);
1390
1391
};

1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
// Implements the Not(m) matcher, which matches a value that doesn't
// match matcher m.
template <typename InnerMatcher>
class NotMatcher {
 public:
  explicit NotMatcher(InnerMatcher matcher) : matcher_(matcher) {}

  // This template type conversion operator allows Not(m) to be used
  // to match any type m can match.
  template <typename T>
  operator Matcher<T>() const {
1403
    return Matcher<T>(new NotMatcherImpl<T>(SafeMatcherCast<T>(matcher_)));
1404
  }
1405

1406
 private:
1407
  InnerMatcher matcher_;
1408
1409

  GTEST_DISALLOW_ASSIGN_(NotMatcher);
1410
};
1411

1412
1413
1414
1415
1416
1417
1418
1419
1420
// Implements the AllOf(m1, m2) matcher for a particular argument type
// T. We do not nest it inside the BothOfMatcher class template, as
// that will prevent different instantiations of BothOfMatcher from
// sharing the same BothOfMatcherImpl<T> class.
template <typename T>
class BothOfMatcherImpl : public MatcherInterface<T> {
 public:
  BothOfMatcherImpl(const Matcher<T>& matcher1, const Matcher<T>& matcher2)
      : matcher1_(matcher1), matcher2_(matcher2) {}
1421

1422
1423
1424
1425
1426
1427
1428
  virtual void DescribeTo(::std::ostream* os) const {
    *os << "(";
    matcher1_.DescribeTo(os);
    *os << ") and (";
    matcher2_.DescribeTo(os);
    *os << ")";
  }
1429

1430
  virtual void DescribeNegationTo(::std::ostream* os) const {
1431
1432
1433
1434
1435
    *os << "(";
    matcher1_.DescribeNegationTo(os);
    *os << ") or (";
    matcher2_.DescribeNegationTo(os);
    *os << ")";
1436
  }
1437

zhanyong.wan's avatar
zhanyong.wan committed
1438
1439
1440
1441
1442
1443
1444
1445
  virtual bool MatchAndExplain(T x, MatchResultListener* listener) const {
    // If either matcher1_ or matcher2_ doesn't match x, we only need
    // to explain why one of them fails.
    StringMatchResultListener listener1;
    if (!matcher1_.MatchAndExplain(x, &listener1)) {
      *listener << listener1.str();
      return false;
    }
1446

zhanyong.wan's avatar
zhanyong.wan committed
1447
1448
1449
1450
1451
    StringMatchResultListener listener2;
    if (!matcher2_.MatchAndExplain(x, &listener2)) {
      *listener << listener2.str();
      return false;
    }
1452

zhanyong.wan's avatar
zhanyong.wan committed
1453
1454
1455
1456
1457
1458
    // Otherwise we need to explain why *both* of them match.
    const internal::string s1 = listener1.str();
    const internal::string s2 = listener2.str();

    if (s1 == "") {
      *listener << s2;
1459
    } else {
zhanyong.wan's avatar
zhanyong.wan committed
1460
1461
      *listener << s1;
      if (s2 != "") {
1462
        *listener << ", and " << s2;
1463
1464
      }
    }
zhanyong.wan's avatar
zhanyong.wan committed
1465
    return true;
1466
  }
1467

1468
1469
1470
 private:
  const Matcher<T> matcher1_;
  const Matcher<T> matcher2_;
1471
1472

  GTEST_DISALLOW_ASSIGN_(BothOfMatcherImpl);
1473
1474
};

1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
#if GTEST_LANG_CXX11
// MatcherList provides mechanisms for storing a variable number of matchers in
// a list structure (ListType) and creating a combining matcher from such a
// list.
// The template is defined recursively using the following template paramters:
//   * kSize is the length of the MatcherList.
//   * Head is the type of the first matcher of the list.
//   * Tail denotes the types of the remaining matchers of the list.
template <int kSize, typename Head, typename... Tail>
struct MatcherList {
  typedef MatcherList<kSize - 1, Tail...> MatcherListTail;
1486
  typedef ::std::pair<Head, typename MatcherListTail::ListType> ListType;
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512

  // BuildList stores variadic type values in a nested pair structure.
  // Example:
  // MatcherList<3, int, string, float>::BuildList(5, "foo", 2.0) will return
  // the corresponding result of type pair<int, pair<string, float>>.
  static ListType BuildList(const Head& matcher, const Tail&... tail) {
    return ListType(matcher, MatcherListTail::BuildList(tail...));
  }

  // CreateMatcher<T> creates a Matcher<T> from a given list of matchers (built
  // by BuildList()). CombiningMatcher<T> is used to combine the matchers of the
  // list. CombiningMatcher<T> must implement MatcherInterface<T> and have a
  // constructor taking two Matcher<T>s as input.
  template <typename T, template <typename /* T */> class CombiningMatcher>
  static Matcher<T> CreateMatcher(const ListType& matchers) {
    return Matcher<T>(new CombiningMatcher<T>(
        SafeMatcherCast<T>(matchers.first),
        MatcherListTail::template CreateMatcher<T, CombiningMatcher>(
            matchers.second)));
  }
};

// The following defines the base case for the recursive definition of
// MatcherList.
template <typename Matcher1, typename Matcher2>
struct MatcherList<2, Matcher1, Matcher2> {
1513
  typedef ::std::pair<Matcher1, Matcher2> ListType;
1514
1515
1516

  static ListType BuildList(const Matcher1& matcher1,
                            const Matcher2& matcher2) {
1517
    return ::std::pair<Matcher1, Matcher2>(matcher1, matcher2);
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
  }

  template <typename T, template <typename /* T */> class CombiningMatcher>
  static Matcher<T> CreateMatcher(const ListType& matchers) {
    return Matcher<T>(new CombiningMatcher<T>(
        SafeMatcherCast<T>(matchers.first),
        SafeMatcherCast<T>(matchers.second)));
  }
};

// VariadicMatcher is used for the variadic implementation of
// AllOf(m_1, m_2, ...) and AnyOf(m_1, m_2, ...).
// CombiningMatcher<T> is used to recursively combine the provided matchers
// (of type Args...).
template <template <typename T> class CombiningMatcher, typename... Args>
class VariadicMatcher {
 public:
  VariadicMatcher(const Args&... matchers)  // NOLINT
      : matchers_(MatcherListType::BuildList(matchers...)) {}

  // This template type conversion operator allows an
  // VariadicMatcher<Matcher1, Matcher2...> object to match any type that
  // all of the provided matchers (Matcher1, Matcher2, ...) can match.
  template <typename T>
  operator Matcher<T>() const {
    return MatcherListType::template CreateMatcher<T, CombiningMatcher>(
        matchers_);
  }

 private:
  typedef MatcherList<sizeof...(Args), Args...> MatcherListType;

  const typename MatcherListType::ListType matchers_;

  GTEST_DISALLOW_ASSIGN_(VariadicMatcher);
};

template <typename... Args>
using AllOfMatcher = VariadicMatcher<BothOfMatcherImpl, Args...>;

#endif  // GTEST_LANG_CXX11

1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
// Used for implementing the AllOf(m_1, ..., m_n) matcher, which
// matches a value that matches all of the matchers m_1, ..., and m_n.
template <typename Matcher1, typename Matcher2>
class BothOfMatcher {
 public:
  BothOfMatcher(Matcher1 matcher1, Matcher2 matcher2)
      : matcher1_(matcher1), matcher2_(matcher2) {}

  // This template type conversion operator allows a
  // BothOfMatcher<Matcher1, Matcher2> object to match any type that
  // both Matcher1 and Matcher2 can match.
  template <typename T>
  operator Matcher<T>() const {
1573
1574
    return Matcher<T>(new BothOfMatcherImpl<T>(SafeMatcherCast<T>(matcher1_),
                                               SafeMatcherCast<T>(matcher2_)));
1575
  }
1576

1577
 private:
1578
1579
  Matcher1 matcher1_;
  Matcher2 matcher2_;
1580
1581

  GTEST_DISALLOW_ASSIGN_(BothOfMatcher);
1582
};
1583

1584
1585
1586
1587
1588
1589
1590
1591
1592
// Implements the AnyOf(m1, m2) matcher for a particular argument type
// T.  We do not nest it inside the AnyOfMatcher class template, as
// that will prevent different instantiations of AnyOfMatcher from
// sharing the same EitherOfMatcherImpl<T> class.
template <typename T>
class EitherOfMatcherImpl : public MatcherInterface<T> {
 public:
  EitherOfMatcherImpl(const Matcher<T>& matcher1, const Matcher<T>& matcher2)
      : matcher1_(matcher1), matcher2_(matcher2) {}
1593

1594
1595
1596
1597
1598
1599
1600
  virtual void DescribeTo(::std::ostream* os) const {
    *os << "(";
    matcher1_.DescribeTo(os);
    *os << ") or (";
    matcher2_.DescribeTo(os);
    *os << ")";
  }
1601

1602
  virtual void DescribeNegationTo(::std::ostream* os) const {
1603
1604
1605
1606
1607
    *os << "(";
    matcher1_.DescribeNegationTo(os);
    *os << ") and (";
    matcher2_.DescribeNegationTo(os);
    *os << ")";
1608
1609
  }

zhanyong.wan's avatar
zhanyong.wan committed
1610
1611
1612
1613
1614
1615
1616
1617
  virtual bool MatchAndExplain(T x, MatchResultListener* listener) const {
    // If either matcher1_ or matcher2_ matches x, we just need to
    // explain why *one* of them matches.
    StringMatchResultListener listener1;
    if (matcher1_.MatchAndExplain(x, &listener1)) {
      *listener << listener1.str();
      return true;
    }
1618

zhanyong.wan's avatar
zhanyong.wan committed
1619
1620
1621
1622
1623
    StringMatchResultListener listener2;
    if (matcher2_.MatchAndExplain(x, &listener2)) {
      *listener << listener2.str();
      return true;
    }
1624

zhanyong.wan's avatar
zhanyong.wan committed
1625
1626
1627
1628
1629
1630
1631
1632
1633
    // Otherwise we need to explain why *both* of them fail.
    const internal::string s1 = listener1.str();
    const internal::string s2 = listener2.str();

    if (s1 == "") {
      *listener << s2;
    } else {
      *listener << s1;
      if (s2 != "") {
1634
        *listener << ", and " << s2;
1635
1636
      }
    }
zhanyong.wan's avatar
zhanyong.wan committed
1637
    return false;
1638
  }
1639

1640
1641
1642
 private:
  const Matcher<T> matcher1_;
  const Matcher<T> matcher2_;
1643
1644

  GTEST_DISALLOW_ASSIGN_(EitherOfMatcherImpl);
1645
1646
};

1647
1648
1649
1650
1651
1652
1653
#if GTEST_LANG_CXX11
// AnyOfMatcher is used for the variadic implementation of AnyOf(m_1, m_2, ...).
template <typename... Args>
using AnyOfMatcher = VariadicMatcher<EitherOfMatcherImpl, Args...>;

#endif  // GTEST_LANG_CXX11

1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
// Used for implementing the AnyOf(m_1, ..., m_n) matcher, which
// matches a value that matches at least one of the matchers m_1, ...,
// and m_n.
template <typename Matcher1, typename Matcher2>
class EitherOfMatcher {
 public:
  EitherOfMatcher(Matcher1 matcher1, Matcher2 matcher2)
      : matcher1_(matcher1), matcher2_(matcher2) {}

  // This template type conversion operator allows a
  // EitherOfMatcher<Matcher1, Matcher2> object to match any type that
  // both Matcher1 and Matcher2 can match.
  template <typename T>
  operator Matcher<T>() const {
1668
1669
    return Matcher<T>(new EitherOfMatcherImpl<T>(
        SafeMatcherCast<T>(matcher1_), SafeMatcherCast<T>(matcher2_)));
1670
  }
1671

1672
1673
1674
 private:
  Matcher1 matcher1_;
  Matcher2 matcher2_;
1675
1676

  GTEST_DISALLOW_ASSIGN_(EitherOfMatcher);
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
};

// Used for implementing Truly(pred), which turns a predicate into a
// matcher.
template <typename Predicate>
class TrulyMatcher {
 public:
  explicit TrulyMatcher(Predicate pred) : predicate_(pred) {}

  // This method template allows Truly(pred) to be used as a matcher
  // for type T where T is the argument type of predicate 'pred'.  The
  // argument is passed by reference as the predicate may be
  // interested in the address of the argument.
  template <typename T>
1691
1692
  bool MatchAndExplain(T& x,  // NOLINT
                       MatchResultListener* /* listener */) const {
1693
1694
1695
1696
1697
1698
1699
1700
1701
    // Without the if-statement, MSVC sometimes warns about converting
    // a value to bool (warning 4800).
    //
    // We cannot write 'return !!predicate_(x);' as that doesn't work
    // when predicate_(x) returns a class convertible to bool but
    // having no operator!().
    if (predicate_(x))
      return true;
    return false;
1702
1703
1704
1705
1706
1707
1708
1709
1710
  }

  void DescribeTo(::std::ostream* os) const {
    *os << "satisfies the given predicate";
  }

  void DescribeNegationTo(::std::ostream* os) const {
    *os << "doesn't satisfy the given predicate";
  }
1711

1712
1713
 private:
  Predicate predicate_;
1714
1715

  GTEST_DISALLOW_ASSIGN_(TrulyMatcher);
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
};

// Used for implementing Matches(matcher), which turns a matcher into
// a predicate.
template <typename M>
class MatcherAsPredicate {
 public:
  explicit MatcherAsPredicate(M matcher) : matcher_(matcher) {}

  // This template operator() allows Matches(m) to be used as a
  // predicate on type T where m is a matcher on type T.
  //
  // The argument x is passed by reference instead of by value, as
  // some matcher may be interested in its address (e.g. as in
  // Matches(Ref(n))(x)).
  template <typename T>
  bool operator()(const T& x) const {
    // We let matcher_ commit to a particular type here instead of
    // when the MatcherAsPredicate object was constructed.  This
    // allows us to write Matches(m) where m is a polymorphic matcher
    // (e.g. Eq(5)).
    //
    // If we write Matcher<T>(matcher_).Matches(x) here, it won't
    // compile when matcher_ has type Matcher<const T&>; if we write
    // Matcher<const T&>(matcher_).Matches(x) here, it won't compile
    // when matcher_ has type Matcher<T>; if we just write
    // matcher_.Matches(x), it won't compile when matcher_ is
    // polymorphic, e.g. Eq(5).
    //
    // MatcherCast<const T&>() is necessary for making the code work
    // in all of the above situations.
    return MatcherCast<const T&>(matcher_).Matches(x);
  }
1749

1750
1751
 private:
  M matcher_;
1752
1753

  GTEST_DISALLOW_ASSIGN_(MatcherAsPredicate);
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
};

// For implementing ASSERT_THAT() and EXPECT_THAT().  The template
// argument M must be a type that can be converted to a matcher.
template <typename M>
class PredicateFormatterFromMatcher {
 public:
  explicit PredicateFormatterFromMatcher(const M& m) : matcher_(m) {}

  // This template () operator allows a PredicateFormatterFromMatcher
  // object to act as a predicate-formatter suitable for using with
  // Google Test's EXPECT_PRED_FORMAT1() macro.
  template <typename T>
  AssertionResult operator()(const char* value_text, const T& x) const {
    // We convert matcher_ to a Matcher<const T&> *now* instead of
    // when the PredicateFormatterFromMatcher object was constructed,
    // as matcher_ may be polymorphic (e.g. NotNull()) and we won't
    // know which type to instantiate it to until we actually see the
    // type of x here.
    //
1774
    // We write SafeMatcherCast<const T&>(matcher_) instead of
1775
1776
    // Matcher<const T&>(matcher_), as the latter won't compile when
    // matcher_ has type Matcher<T> (e.g. An<int>()).
1777
1778
1779
    // We don't write MatcherCast<const T&> either, as that allows
    // potentially unsafe downcasting of the matcher argument.
    const Matcher<const T&> matcher = SafeMatcherCast<const T&>(matcher_);
zhanyong.wan's avatar
zhanyong.wan committed
1780
    StringMatchResultListener listener;
1781
    if (MatchPrintAndExplain(x, matcher, &listener))
1782
      return AssertionSuccess();
1783
1784
1785
1786
1787
1788
1789

    ::std::stringstream ss;
    ss << "Value of: " << value_text << "\n"
       << "Expected: ";
    matcher.DescribeTo(&ss);
    ss << "\n  Actual: " << listener.str();
    return AssertionFailure() << ss.str();
1790
  }
1791

1792
1793
 private:
  const M matcher_;
1794
1795

  GTEST_DISALLOW_ASSIGN_(PredicateFormatterFromMatcher);
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
};

// A helper function for converting a matcher to a predicate-formatter
// without the user needing to explicitly write the type.  This is
// used for implementing ASSERT_THAT() and EXPECT_THAT().
template <typename M>
inline PredicateFormatterFromMatcher<M>
MakePredicateFormatterFromMatcher(const M& matcher) {
  return PredicateFormatterFromMatcher<M>(matcher);
}

1807
1808
1809
1810
// Implements the polymorphic floating point equality matcher, which matches
// two float values using ULP-based approximation or, optionally, a
// user-specified epsilon.  The template is meant to be instantiated with
// FloatType being either float or double.
1811
1812
1813
1814
1815
1816
template <typename FloatType>
class FloatingEqMatcher {
 public:
  // Constructor for FloatingEqMatcher.
  // The matcher's input will be compared with rhs.  The matcher treats two
  // NANs as equal if nan_eq_nan is true.  Otherwise, under IEEE standards,
1817
1818
1819
  // equality comparisons between NANs will always return false.  We specify a
  // negative max_abs_error_ term to indicate that ULP-based approximation will
  // be used for comparison.
1820
  FloatingEqMatcher(FloatType rhs, bool nan_eq_nan) :
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
    rhs_(rhs), nan_eq_nan_(nan_eq_nan), max_abs_error_(-1) {
  }

  // Constructor that supports a user-specified max_abs_error that will be used
  // for comparison instead of ULP-based approximation.  The max absolute
  // should be non-negative.
  FloatingEqMatcher(FloatType rhs, bool nan_eq_nan, FloatType max_abs_error) :
    rhs_(rhs), nan_eq_nan_(nan_eq_nan), max_abs_error_(max_abs_error) {
    GTEST_CHECK_(max_abs_error >= 0)
        << ", where max_abs_error is" << max_abs_error;
  }
1832
1833
1834
1835
1836

  // Implements floating point equality matcher as a Matcher<T>.
  template <typename T>
  class Impl : public MatcherInterface<T> {
   public:
1837
1838
    Impl(FloatType rhs, bool nan_eq_nan, FloatType max_abs_error) :
      rhs_(rhs), nan_eq_nan_(nan_eq_nan), max_abs_error_(max_abs_error) {}
1839

zhanyong.wan's avatar
zhanyong.wan committed
1840
1841
    virtual bool MatchAndExplain(T value,
                                 MatchResultListener* /* listener */) const {
1842
1843
1844
      const FloatingPoint<FloatType> lhs(value), rhs(rhs_);

      // Compares NaNs first, if nan_eq_nan_ is true.
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
      if (lhs.is_nan() || rhs.is_nan()) {
        if (lhs.is_nan() && rhs.is_nan()) {
          return nan_eq_nan_;
        }
        // One is nan; the other is not nan.
        return false;
      }
      if (HasMaxAbsError()) {
        // We perform an equality check so that inf will match inf, regardless
        // of error bounds.  If the result of value - rhs_ would result in
        // overflow or if either value is inf, the default result is infinity,
        // which should only match if max_abs_error_ is also infinity.
        return value == rhs_ || fabs(value - rhs_) <= max_abs_error_;
      } else {
        return lhs.AlmostEquals(rhs);
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
      }
    }

    virtual void DescribeTo(::std::ostream* os) const {
      // os->precision() returns the previously set precision, which we
      // store to restore the ostream to its original configuration
      // after outputting.
      const ::std::streamsize old_precision = os->precision(
          ::std::numeric_limits<FloatType>::digits10 + 2);
      if (FloatingPoint<FloatType>(rhs_).is_nan()) {
        if (nan_eq_nan_) {
          *os << "is NaN";
        } else {
          *os << "never matches";
        }
      } else {
        *os << "is approximately " << rhs_;
1877
1878
1879
        if (HasMaxAbsError()) {
          *os << " (absolute error <= " << max_abs_error_ << ")";
        }
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
      }
      os->precision(old_precision);
    }

    virtual void DescribeNegationTo(::std::ostream* os) const {
      // As before, get original precision.
      const ::std::streamsize old_precision = os->precision(
          ::std::numeric_limits<FloatType>::digits10 + 2);
      if (FloatingPoint<FloatType>(rhs_).is_nan()) {
        if (nan_eq_nan_) {
1890
          *os << "isn't NaN";
1891
1892
1893
1894
        } else {
          *os << "is anything";
        }
      } else {
1895
        *os << "isn't approximately " << rhs_;
1896
1897
1898
        if (HasMaxAbsError()) {
          *os << " (absolute error > " << max_abs_error_ << ")";
        }
1899
1900
1901
1902
1903
1904
      }
      // Restore original precision.
      os->precision(old_precision);
    }

   private:
1905
1906
1907
1908
    bool HasMaxAbsError() const {
      return max_abs_error_ >= 0;
    }

1909
1910
    const FloatType rhs_;
    const bool nan_eq_nan_;
1911
1912
    // max_abs_error will be used for value comparison when >= 0.
    const FloatType max_abs_error_;
1913
1914

    GTEST_DISALLOW_ASSIGN_(Impl);
1915
1916
1917
1918
1919
1920
1921
1922
1923
  };

  // The following 3 type conversion operators allow FloatEq(rhs) and
  // NanSensitiveFloatEq(rhs) to be used as a Matcher<float>, a
  // Matcher<const float&>, or a Matcher<float&>, but nothing else.
  // (While Google's C++ coding style doesn't allow arguments passed
  // by non-const reference, we may see them in code not conforming to
  // the style.  Therefore Google Mock needs to support them.)
  operator Matcher<FloatType>() const {
1924
    return MakeMatcher(new Impl<FloatType>(rhs_, nan_eq_nan_, max_abs_error_));
1925
1926
1927
  }

  operator Matcher<const FloatType&>() const {
1928
1929
    return MakeMatcher(
        new Impl<const FloatType&>(rhs_, nan_eq_nan_, max_abs_error_));
1930
1931
1932
  }

  operator Matcher<FloatType&>() const {
1933
    return MakeMatcher(new Impl<FloatType&>(rhs_, nan_eq_nan_, max_abs_error_));
1934
  }
1935

1936
1937
1938
 private:
  const FloatType rhs_;
  const bool nan_eq_nan_;
1939
1940
  // max_abs_error will be used for value comparison when >= 0.
  const FloatType max_abs_error_;
1941
1942

  GTEST_DISALLOW_ASSIGN_(FloatingEqMatcher);
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
};

// Implements the Pointee(m) matcher for matching a pointer whose
// pointee matches matcher m.  The pointer can be either raw or smart.
template <typename InnerMatcher>
class PointeeMatcher {
 public:
  explicit PointeeMatcher(const InnerMatcher& matcher) : matcher_(matcher) {}

  // This type conversion operator template allows Pointee(m) to be
  // used as a matcher for any pointer type whose pointee type is
  // compatible with the inner matcher, where type Pointer can be
  // either a raw pointer or a smart pointer.
  //
  // The reason we do this instead of relying on
  // MakePolymorphicMatcher() is that the latter is not flexible
  // enough for implementing the DescribeTo() method of Pointee().
  template <typename Pointer>
  operator Matcher<Pointer>() const {
    return MakeMatcher(new Impl<Pointer>(matcher_));
  }
1964

1965
1966
1967
1968
1969
 private:
  // The monomorphic implementation that works for a particular pointer type.
  template <typename Pointer>
  class Impl : public MatcherInterface<Pointer> {
   public:
1970
1971
    typedef typename PointeeOf<GTEST_REMOVE_CONST_(  // NOLINT
        GTEST_REMOVE_REFERENCE_(Pointer))>::type Pointee;
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985

    explicit Impl(const InnerMatcher& matcher)
        : matcher_(MatcherCast<const Pointee&>(matcher)) {}

    virtual void DescribeTo(::std::ostream* os) const {
      *os << "points to a value that ";
      matcher_.DescribeTo(os);
    }

    virtual void DescribeNegationTo(::std::ostream* os) const {
      *os << "does not point to a value that ";
      matcher_.DescribeTo(os);
    }

zhanyong.wan's avatar
zhanyong.wan committed
1986
1987
    virtual bool MatchAndExplain(Pointer pointer,
                                 MatchResultListener* listener) const {
1988
      if (GetRawPointer(pointer) == NULL)
zhanyong.wan's avatar
zhanyong.wan committed
1989
        return false;
1990

1991
1992
      *listener << "which points to ";
      return MatchPrintAndExplain(*pointer, matcher_, listener);
1993
    }
1994

1995
1996
   private:
    const Matcher<const Pointee&> matcher_;
1997
1998

    GTEST_DISALLOW_ASSIGN_(Impl);
1999
2000
2001
  };

  const InnerMatcher matcher_;
2002
2003

  GTEST_DISALLOW_ASSIGN_(PointeeMatcher);
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
};

// Implements the Field() matcher for matching a field (i.e. member
// variable) of an object.
template <typename Class, typename FieldType>
class FieldMatcher {
 public:
  FieldMatcher(FieldType Class::*field,
               const Matcher<const FieldType&>& matcher)
      : field_(field), matcher_(matcher) {}

  void DescribeTo(::std::ostream* os) const {
2016
    *os << "is an object whose given field ";
2017
2018
2019
2020
    matcher_.DescribeTo(os);
  }

  void DescribeNegationTo(::std::ostream* os) const {
2021
    *os << "is an object whose given field ";
2022
2023
2024
    matcher_.DescribeNegationTo(os);
  }

2025
2026
2027
2028
  template <typename T>
  bool MatchAndExplain(const T& value, MatchResultListener* listener) const {
    return MatchAndExplainImpl(
        typename ::testing::internal::
2029
            is_pointer<GTEST_REMOVE_CONST_(T)>::type(),
2030
2031
2032
2033
2034
        value, listener);
  }

 private:
  // The first argument of MatchAndExplainImpl() is needed to help
2035
2036
  // Symbian's C++ compiler choose which overload to use.  Its type is
  // true_type iff the Field() matcher is used to match a pointer.
2037
2038
  bool MatchAndExplainImpl(false_type /* is_not_pointer */, const Class& obj,
                           MatchResultListener* listener) const {
2039
2040
    *listener << "whose given field is ";
    return MatchPrintAndExplain(obj.*field_, matcher_, listener);
2041
2042
  }

2043
2044
  bool MatchAndExplainImpl(true_type /* is_pointer */, const Class* p,
                           MatchResultListener* listener) const {
zhanyong.wan's avatar
zhanyong.wan committed
2045
2046
2047
    if (p == NULL)
      return false;

2048
    *listener << "which points to an object ";
zhanyong.wan's avatar
zhanyong.wan committed
2049
2050
2051
    // Since *p has a field, it must be a class/struct/union type and
    // thus cannot be a pointer.  Therefore we pass false_type() as
    // the first argument.
2052
    return MatchAndExplainImpl(false_type(), *p, listener);
2053
  }
2054

2055
2056
  const FieldType Class::*field_;
  const Matcher<const FieldType&> matcher_;
2057
2058

  GTEST_DISALLOW_ASSIGN_(FieldMatcher);
2059
2060
2061
2062
2063
2064
2065
2066
2067
};

// Implements the Property() matcher for matching a property
// (i.e. return value of a getter method) of an object.
template <typename Class, typename PropertyType>
class PropertyMatcher {
 public:
  // The property may have a reference type, so 'const PropertyType&'
  // may cause double references and fail to compile.  That's why we
2068
  // need GTEST_REFERENCE_TO_CONST, which works regardless of
2069
  // PropertyType being a reference or not.
2070
  typedef GTEST_REFERENCE_TO_CONST_(PropertyType) RefToConstProperty;
2071
2072
2073
2074
2075
2076

  PropertyMatcher(PropertyType (Class::*property)() const,
                  const Matcher<RefToConstProperty>& matcher)
      : property_(property), matcher_(matcher) {}

  void DescribeTo(::std::ostream* os) const {
2077
    *os << "is an object whose given property ";
2078
2079
2080
2081
    matcher_.DescribeTo(os);
  }

  void DescribeNegationTo(::std::ostream* os) const {
2082
    *os << "is an object whose given property ";
2083
2084
2085
    matcher_.DescribeNegationTo(os);
  }

2086
2087
2088
2089
  template <typename T>
  bool MatchAndExplain(const T&value, MatchResultListener* listener) const {
    return MatchAndExplainImpl(
        typename ::testing::internal::
2090
            is_pointer<GTEST_REMOVE_CONST_(T)>::type(),
2091
2092
2093
2094
2095
        value, listener);
  }

 private:
  // The first argument of MatchAndExplainImpl() is needed to help
2096
2097
  // Symbian's C++ compiler choose which overload to use.  Its type is
  // true_type iff the Property() matcher is used to match a pointer.
2098
2099
  bool MatchAndExplainImpl(false_type /* is_not_pointer */, const Class& obj,
                           MatchResultListener* listener) const {
2100
2101
2102
2103
2104
    *listener << "whose given property is ";
    // Cannot pass the return value (for example, int) to MatchPrintAndExplain,
    // which takes a non-const reference as argument.
    RefToConstProperty result = (obj.*property_)();
    return MatchPrintAndExplain(result, matcher_, listener);
2105
2106
  }

2107
2108
  bool MatchAndExplainImpl(true_type /* is_pointer */, const Class* p,
                           MatchResultListener* listener) const {
zhanyong.wan's avatar
zhanyong.wan committed
2109
2110
2111
    if (p == NULL)
      return false;

2112
    *listener << "which points to an object ";
zhanyong.wan's avatar
zhanyong.wan committed
2113
2114
2115
    // Since *p has a property method, it must be a class/struct/union
    // type and thus cannot be a pointer.  Therefore we pass
    // false_type() as the first argument.
2116
    return MatchAndExplainImpl(false_type(), *p, listener);
2117
  }
2118

2119
2120
  PropertyType (Class::*property_)() const;
  const Matcher<RefToConstProperty> matcher_;
2121
2122

  GTEST_DISALLOW_ASSIGN_(PropertyMatcher);
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
};

// Type traits specifying various features of different functors for ResultOf.
// The default template specifies features for functor objects.
// Functor classes have to typedef argument_type and result_type
// to be compatible with ResultOf.
template <typename Functor>
struct CallableTraits {
  typedef typename Functor::result_type ResultType;
  typedef Functor StorageType;

2134
  static void CheckIsValid(Functor /* functor */) {}
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
  template <typename T>
  static ResultType Invoke(Functor f, T arg) { return f(arg); }
};

// Specialization for function pointers.
template <typename ArgType, typename ResType>
struct CallableTraits<ResType(*)(ArgType)> {
  typedef ResType ResultType;
  typedef ResType(*StorageType)(ArgType);

  static void CheckIsValid(ResType(*f)(ArgType)) {
2146
    GTEST_CHECK_(f != NULL)
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
        << "NULL function pointer is passed into ResultOf().";
  }
  template <typename T>
  static ResType Invoke(ResType(*f)(ArgType), T arg) {
    return (*f)(arg);
  }
};

// Implements the ResultOf() matcher for matching a return value of a
// unary function of an object.
template <typename Callable>
class ResultOfMatcher {
 public:
  typedef typename CallableTraits<Callable>::ResultType ResultType;

  ResultOfMatcher(Callable callable, const Matcher<ResultType>& matcher)
      : callable_(callable), matcher_(matcher) {
    CallableTraits<Callable>::CheckIsValid(callable_);
  }

  template <typename T>
  operator Matcher<T>() const {
    return Matcher<T>(new Impl<T>(callable_, matcher_));
  }

 private:
  typedef typename CallableTraits<Callable>::StorageType CallableStorageType;

  template <typename T>
  class Impl : public MatcherInterface<T> {
   public:
    Impl(CallableStorageType callable, const Matcher<ResultType>& matcher)
        : callable_(callable), matcher_(matcher) {}

    virtual void DescribeTo(::std::ostream* os) const {
2182
      *os << "is mapped by the given callable to a value that ";
2183
2184
2185
2186
      matcher_.DescribeTo(os);
    }

    virtual void DescribeNegationTo(::std::ostream* os) const {
2187
      *os << "is mapped by the given callable to a value that ";
2188
2189
2190
      matcher_.DescribeNegationTo(os);
    }

zhanyong.wan's avatar
zhanyong.wan committed
2191
    virtual bool MatchAndExplain(T obj, MatchResultListener* listener) const {
2192
2193
2194
2195
2196
2197
      *listener << "which is mapped by the given callable to ";
      // Cannot pass the return value (for example, int) to
      // MatchPrintAndExplain, which takes a non-const reference as argument.
      ResultType result =
          CallableTraits<Callable>::template Invoke<T>(callable_, obj);
      return MatchPrintAndExplain(result, matcher_, listener);
2198
    }
2199

2200
2201
2202
2203
2204
2205
2206
2207
   private:
    // Functors often define operator() as non-const method even though
    // they are actualy stateless. But we need to use them even when
    // 'this' is a const pointer. It's the user's responsibility not to
    // use stateful callables with ResultOf(), which does't guarantee
    // how many times the callable will be invoked.
    mutable CallableStorageType callable_;
    const Matcher<ResultType> matcher_;
2208
2209

    GTEST_DISALLOW_ASSIGN_(Impl);
2210
2211
2212
2213
  };  // class Impl

  const CallableStorageType callable_;
  const Matcher<ResultType> matcher_;
2214
2215

  GTEST_DISALLOW_ASSIGN_(ResultOfMatcher);
2216
2217
};

zhanyong.wan's avatar
zhanyong.wan committed
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
// Implements a matcher that checks the size of an STL-style container.
template <typename SizeMatcher>
class SizeIsMatcher {
 public:
  explicit SizeIsMatcher(const SizeMatcher& size_matcher)
       : size_matcher_(size_matcher) {
  }

  template <typename Container>
  operator Matcher<Container>() const {
    return MakeMatcher(new Impl<Container>(size_matcher_));
  }

  template <typename Container>
  class Impl : public MatcherInterface<Container> {
   public:
    typedef internal::StlContainerView<
         GTEST_REMOVE_REFERENCE_AND_CONST_(Container)> ContainerView;
    typedef typename ContainerView::type::size_type SizeType;
    explicit Impl(const SizeMatcher& size_matcher)
        : size_matcher_(MatcherCast<SizeType>(size_matcher)) {}

    virtual void DescribeTo(::std::ostream* os) const {
      *os << "size ";
      size_matcher_.DescribeTo(os);
    }
    virtual void DescribeNegationTo(::std::ostream* os) const {
      *os << "size ";
      size_matcher_.DescribeNegationTo(os);
    }

    virtual bool MatchAndExplain(Container container,
                                 MatchResultListener* listener) const {
      SizeType size = container.size();
      StringMatchResultListener size_listener;
      const bool result = size_matcher_.MatchAndExplain(size, &size_listener);
      *listener
          << "whose size " << size << (result ? " matches" : " doesn't match");
      PrintIfNotEmpty(size_listener.str(), listener->stream());
      return result;
    }

   private:
    const Matcher<SizeType> size_matcher_;
    GTEST_DISALLOW_ASSIGN_(Impl);
  };

 private:
  const SizeMatcher size_matcher_;
  GTEST_DISALLOW_ASSIGN_(SizeIsMatcher);
};

zhanyong.wan's avatar
zhanyong.wan committed
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
// Implements an equality matcher for any STL-style container whose elements
// support ==. This matcher is like Eq(), but its failure explanations provide
// more detailed information that is useful when the container is used as a set.
// The failure message reports elements that are in one of the operands but not
// the other. The failure messages do not report duplicate or out-of-order
// elements in the containers (which don't properly matter to sets, but can
// occur if the containers are vectors or lists, for example).
//
// Uses the container's const_iterator, value_type, operator ==,
// begin(), and end().
template <typename Container>
class ContainerEqMatcher {
 public:
2283
2284
2285
2286
2287
2288
2289
2290
2291
  typedef internal::StlContainerView<Container> View;
  typedef typename View::type StlContainer;
  typedef typename View::const_reference StlContainerReference;

  // We make a copy of rhs in case the elements in it are modified
  // after this matcher is created.
  explicit ContainerEqMatcher(const Container& rhs) : rhs_(View::Copy(rhs)) {
    // Makes sure the user doesn't instantiate this class template
    // with a const or reference type.
zhanyong.wan's avatar
zhanyong.wan committed
2292
2293
    (void)testing::StaticAssertTypeEq<Container,
        GTEST_REMOVE_REFERENCE_AND_CONST_(Container)>();
2294
2295
  }

zhanyong.wan's avatar
zhanyong.wan committed
2296
2297
  void DescribeTo(::std::ostream* os) const {
    *os << "equals ";
vladlosev's avatar
vladlosev committed
2298
    UniversalPrint(rhs_, os);
zhanyong.wan's avatar
zhanyong.wan committed
2299
2300
2301
  }
  void DescribeNegationTo(::std::ostream* os) const {
    *os << "does not equal ";
vladlosev's avatar
vladlosev committed
2302
    UniversalPrint(rhs_, os);
zhanyong.wan's avatar
zhanyong.wan committed
2303
2304
  }

2305
  template <typename LhsContainer>
2306
2307
  bool MatchAndExplain(const LhsContainer& lhs,
                       MatchResultListener* listener) const {
2308
    // GTEST_REMOVE_CONST_() is needed to work around an MSVC 8.0 bug
2309
    // that causes LhsContainer to be a const type sometimes.
2310
    typedef internal::StlContainerView<GTEST_REMOVE_CONST_(LhsContainer)>
2311
2312
2313
        LhsView;
    typedef typename LhsView::type LhsStlContainer;
    StlContainerReference lhs_stl_container = LhsView::ConstReference(lhs);
2314
2315
    if (lhs_stl_container == rhs_)
      return true;
2316

2317
2318
    ::std::ostream* const os = listener->stream();
    if (os != NULL) {
2319
      // Something is different. Check for extra values first.
2320
2321
2322
2323
2324
2325
2326
2327
2328
      bool printed_header = false;
      for (typename LhsStlContainer::const_iterator it =
               lhs_stl_container.begin();
           it != lhs_stl_container.end(); ++it) {
        if (internal::ArrayAwareFind(rhs_.begin(), rhs_.end(), *it) ==
            rhs_.end()) {
          if (printed_header) {
            *os << ", ";
          } else {
2329
            *os << "which has these unexpected elements: ";
2330
2331
            printed_header = true;
          }
vladlosev's avatar
vladlosev committed
2332
          UniversalPrint(*it, os);
zhanyong.wan's avatar
zhanyong.wan committed
2333
2334
2335
        }
      }

2336
      // Now check for missing values.
2337
2338
2339
2340
2341
2342
2343
2344
2345
      bool printed_header2 = false;
      for (typename StlContainer::const_iterator it = rhs_.begin();
           it != rhs_.end(); ++it) {
        if (internal::ArrayAwareFind(
                lhs_stl_container.begin(), lhs_stl_container.end(), *it) ==
            lhs_stl_container.end()) {
          if (printed_header2) {
            *os << ", ";
          } else {
2346
2347
            *os << (printed_header ? ",\nand" : "which")
                << " doesn't have these expected elements: ";
2348
2349
            printed_header2 = true;
          }
vladlosev's avatar
vladlosev committed
2350
          UniversalPrint(*it, os);
zhanyong.wan's avatar
zhanyong.wan committed
2351
2352
2353
        }
      }
    }
2354
2355

    return false;
zhanyong.wan's avatar
zhanyong.wan committed
2356
  }
2357

zhanyong.wan's avatar
zhanyong.wan committed
2358
 private:
2359
  const StlContainer rhs_;
2360
2361

  GTEST_DISALLOW_ASSIGN_(ContainerEqMatcher);
zhanyong.wan's avatar
zhanyong.wan committed
2362
2363
};

2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
// A comparator functor that uses the < operator to compare two values.
struct LessComparator {
  template <typename T, typename U>
  bool operator()(const T& lhs, const U& rhs) const { return lhs < rhs; }
};

// Implements WhenSortedBy(comparator, container_matcher).
template <typename Comparator, typename ContainerMatcher>
class WhenSortedByMatcher {
 public:
  WhenSortedByMatcher(const Comparator& comparator,
                      const ContainerMatcher& matcher)
      : comparator_(comparator), matcher_(matcher) {}

  template <typename LhsContainer>
  operator Matcher<LhsContainer>() const {
    return MakeMatcher(new Impl<LhsContainer>(comparator_, matcher_));
  }

  template <typename LhsContainer>
  class Impl : public MatcherInterface<LhsContainer> {
   public:
    typedef internal::StlContainerView<
         GTEST_REMOVE_REFERENCE_AND_CONST_(LhsContainer)> LhsView;
    typedef typename LhsView::type LhsStlContainer;
    typedef typename LhsView::const_reference LhsStlContainerReference;
2390
2391
2392
2393
    // Transforms std::pair<const Key, Value> into std::pair<Key, Value>
    // so that we can match associative containers.
    typedef typename RemoveConstFromKey<
        typename LhsStlContainer::value_type>::type LhsValue;
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410

    Impl(const Comparator& comparator, const ContainerMatcher& matcher)
        : comparator_(comparator), matcher_(matcher) {}

    virtual void DescribeTo(::std::ostream* os) const {
      *os << "(when sorted) ";
      matcher_.DescribeTo(os);
    }

    virtual void DescribeNegationTo(::std::ostream* os) const {
      *os << "(when sorted) ";
      matcher_.DescribeNegationTo(os);
    }

    virtual bool MatchAndExplain(LhsContainer lhs,
                                 MatchResultListener* listener) const {
      LhsStlContainerReference lhs_stl_container = LhsView::ConstReference(lhs);
2411
2412
2413
2414
      ::std::vector<LhsValue> sorted_container(lhs_stl_container.begin(),
                                               lhs_stl_container.end());
      ::std::sort(
           sorted_container.begin(), sorted_container.end(), comparator_);
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434

      if (!listener->IsInterested()) {
        // If the listener is not interested, we do not need to
        // construct the inner explanation.
        return matcher_.Matches(sorted_container);
      }

      *listener << "which is ";
      UniversalPrint(sorted_container, listener->stream());
      *listener << " when sorted";

      StringMatchResultListener inner_listener;
      const bool match = matcher_.MatchAndExplain(sorted_container,
                                                  &inner_listener);
      PrintIfNotEmpty(inner_listener.str(), listener->stream());
      return match;
    }

   private:
    const Comparator comparator_;
2435
    const Matcher<const ::std::vector<LhsValue>&> matcher_;
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446

    GTEST_DISALLOW_COPY_AND_ASSIGN_(Impl);
  };

 private:
  const Comparator comparator_;
  const ContainerMatcher matcher_;

  GTEST_DISALLOW_ASSIGN_(WhenSortedByMatcher);
};

zhanyong.wan's avatar
zhanyong.wan committed
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
// Implements Pointwise(tuple_matcher, rhs_container).  tuple_matcher
// must be able to be safely cast to Matcher<tuple<const T1&, const
// T2&> >, where T1 and T2 are the types of elements in the LHS
// container and the RHS container respectively.
template <typename TupleMatcher, typename RhsContainer>
class PointwiseMatcher {
 public:
  typedef internal::StlContainerView<RhsContainer> RhsView;
  typedef typename RhsView::type RhsStlContainer;
  typedef typename RhsStlContainer::value_type RhsValue;

  // Like ContainerEq, we make a copy of rhs in case the elements in
  // it are modified after this matcher is created.
  PointwiseMatcher(const TupleMatcher& tuple_matcher, const RhsContainer& rhs)
      : tuple_matcher_(tuple_matcher), rhs_(RhsView::Copy(rhs)) {
    // Makes sure the user doesn't instantiate this class template
    // with a const or reference type.
    (void)testing::StaticAssertTypeEq<RhsContainer,
        GTEST_REMOVE_REFERENCE_AND_CONST_(RhsContainer)>();
  }

  template <typename LhsContainer>
  operator Matcher<LhsContainer>() const {
    return MakeMatcher(new Impl<LhsContainer>(tuple_matcher_, rhs_));
  }

  template <typename LhsContainer>
  class Impl : public MatcherInterface<LhsContainer> {
   public:
    typedef internal::StlContainerView<
         GTEST_REMOVE_REFERENCE_AND_CONST_(LhsContainer)> LhsView;
    typedef typename LhsView::type LhsStlContainer;
    typedef typename LhsView::const_reference LhsStlContainerReference;
    typedef typename LhsStlContainer::value_type LhsValue;
    // We pass the LHS value and the RHS value to the inner matcher by
    // reference, as they may be expensive to copy.  We must use tuple
    // instead of pair here, as a pair cannot hold references (C++ 98,
    // 20.2.2 [lib.pairs]).
2485
    typedef ::std::tr1::tuple<const LhsValue&, const RhsValue&> InnerMatcherArg;
zhanyong.wan's avatar
zhanyong.wan committed
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556

    Impl(const TupleMatcher& tuple_matcher, const RhsStlContainer& rhs)
        // mono_tuple_matcher_ holds a monomorphic version of the tuple matcher.
        : mono_tuple_matcher_(SafeMatcherCast<InnerMatcherArg>(tuple_matcher)),
          rhs_(rhs) {}

    virtual void DescribeTo(::std::ostream* os) const {
      *os << "contains " << rhs_.size()
          << " values, where each value and its corresponding value in ";
      UniversalPrinter<RhsStlContainer>::Print(rhs_, os);
      *os << " ";
      mono_tuple_matcher_.DescribeTo(os);
    }
    virtual void DescribeNegationTo(::std::ostream* os) const {
      *os << "doesn't contain exactly " << rhs_.size()
          << " values, or contains a value x at some index i"
          << " where x and the i-th value of ";
      UniversalPrint(rhs_, os);
      *os << " ";
      mono_tuple_matcher_.DescribeNegationTo(os);
    }

    virtual bool MatchAndExplain(LhsContainer lhs,
                                 MatchResultListener* listener) const {
      LhsStlContainerReference lhs_stl_container = LhsView::ConstReference(lhs);
      const size_t actual_size = lhs_stl_container.size();
      if (actual_size != rhs_.size()) {
        *listener << "which contains " << actual_size << " values";
        return false;
      }

      typename LhsStlContainer::const_iterator left = lhs_stl_container.begin();
      typename RhsStlContainer::const_iterator right = rhs_.begin();
      for (size_t i = 0; i != actual_size; ++i, ++left, ++right) {
        const InnerMatcherArg value_pair(*left, *right);

        if (listener->IsInterested()) {
          StringMatchResultListener inner_listener;
          if (!mono_tuple_matcher_.MatchAndExplain(
                  value_pair, &inner_listener)) {
            *listener << "where the value pair (";
            UniversalPrint(*left, listener->stream());
            *listener << ", ";
            UniversalPrint(*right, listener->stream());
            *listener << ") at index #" << i << " don't match";
            PrintIfNotEmpty(inner_listener.str(), listener->stream());
            return false;
          }
        } else {
          if (!mono_tuple_matcher_.Matches(value_pair))
            return false;
        }
      }

      return true;
    }

   private:
    const Matcher<InnerMatcherArg> mono_tuple_matcher_;
    const RhsStlContainer rhs_;

    GTEST_DISALLOW_ASSIGN_(Impl);
  };

 private:
  const TupleMatcher tuple_matcher_;
  const RhsStlContainer rhs_;

  GTEST_DISALLOW_ASSIGN_(PointwiseMatcher);
};

2557
// Holds the logic common to ContainsMatcherImpl and EachMatcherImpl.
2558
template <typename Container>
2559
class QuantifierMatcherImpl : public MatcherInterface<Container> {
2560
 public:
zhanyong.wan's avatar
zhanyong.wan committed
2561
  typedef GTEST_REMOVE_REFERENCE_AND_CONST_(Container) RawContainer;
2562
2563
2564
2565
2566
2567
  typedef StlContainerView<RawContainer> View;
  typedef typename View::type StlContainer;
  typedef typename View::const_reference StlContainerReference;
  typedef typename StlContainer::value_type Element;

  template <typename InnerMatcher>
2568
  explicit QuantifierMatcherImpl(InnerMatcher inner_matcher)
2569
      : inner_matcher_(
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
           testing::SafeMatcherCast<const Element&>(inner_matcher)) {}

  // Checks whether:
  // * All elements in the container match, if all_elements_should_match.
  // * Any element in the container matches, if !all_elements_should_match.
  bool MatchAndExplainImpl(bool all_elements_should_match,
                           Container container,
                           MatchResultListener* listener) const {
    StlContainerReference stl_container = View::ConstReference(container);
    size_t i = 0;
    for (typename StlContainer::const_iterator it = stl_container.begin();
         it != stl_container.end(); ++it, ++i) {
      StringMatchResultListener inner_listener;
      const bool matches = inner_matcher_.MatchAndExplain(*it, &inner_listener);

      if (matches != all_elements_should_match) {
        *listener << "whose element #" << i
                  << (matches ? " matches" : " doesn't match");
        PrintIfNotEmpty(inner_listener.str(), listener->stream());
        return !all_elements_should_match;
      }
    }
    return all_elements_should_match;
  }

 protected:
  const Matcher<const Element&> inner_matcher_;

  GTEST_DISALLOW_ASSIGN_(QuantifierMatcherImpl);
};

// Implements Contains(element_matcher) for the given argument type Container.
// Symmetric to EachMatcherImpl.
template <typename Container>
class ContainsMatcherImpl : public QuantifierMatcherImpl<Container> {
 public:
  template <typename InnerMatcher>
  explicit ContainsMatcherImpl(InnerMatcher inner_matcher)
      : QuantifierMatcherImpl<Container>(inner_matcher) {}
2609
2610
2611
2612

  // Describes what this matcher does.
  virtual void DescribeTo(::std::ostream* os) const {
    *os << "contains at least one element that ";
2613
    this->inner_matcher_.DescribeTo(os);
2614
2615
2616
2617
  }

  virtual void DescribeNegationTo(::std::ostream* os) const {
    *os << "doesn't contain any element that ";
2618
    this->inner_matcher_.DescribeTo(os);
2619
2620
  }

zhanyong.wan's avatar
zhanyong.wan committed
2621
2622
  virtual bool MatchAndExplain(Container container,
                               MatchResultListener* listener) const {
2623
    return this->MatchAndExplainImpl(false, container, listener);
2624
2625
2626
  }

 private:
2627
  GTEST_DISALLOW_ASSIGN_(ContainsMatcherImpl);
2628
2629
};

2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
// Implements Each(element_matcher) for the given argument type Container.
// Symmetric to ContainsMatcherImpl.
template <typename Container>
class EachMatcherImpl : public QuantifierMatcherImpl<Container> {
 public:
  template <typename InnerMatcher>
  explicit EachMatcherImpl(InnerMatcher inner_matcher)
      : QuantifierMatcherImpl<Container>(inner_matcher) {}

  // Describes what this matcher does.
  virtual void DescribeTo(::std::ostream* os) const {
    *os << "only contains elements that ";
    this->inner_matcher_.DescribeTo(os);
  }

  virtual void DescribeNegationTo(::std::ostream* os) const {
    *os << "contains some element that ";
    this->inner_matcher_.DescribeNegationTo(os);
  }

  virtual bool MatchAndExplain(Container container,
                               MatchResultListener* listener) const {
    return this->MatchAndExplainImpl(true, container, listener);
  }

 private:
  GTEST_DISALLOW_ASSIGN_(EachMatcherImpl);
};

2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
// Implements polymorphic Contains(element_matcher).
template <typename M>
class ContainsMatcher {
 public:
  explicit ContainsMatcher(M m) : inner_matcher_(m) {}

  template <typename Container>
  operator Matcher<Container>() const {
    return MakeMatcher(new ContainsMatcherImpl<Container>(inner_matcher_));
  }

 private:
  const M inner_matcher_;
2672
2673

  GTEST_DISALLOW_ASSIGN_(ContainsMatcher);
2674
2675
};

2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
// Implements polymorphic Each(element_matcher).
template <typename M>
class EachMatcher {
 public:
  explicit EachMatcher(M m) : inner_matcher_(m) {}

  template <typename Container>
  operator Matcher<Container>() const {
    return MakeMatcher(new EachMatcherImpl<Container>(inner_matcher_));
  }

 private:
  const M inner_matcher_;

  GTEST_DISALLOW_ASSIGN_(EachMatcher);
};

2693
2694
2695
2696
2697
2698
2699
// Implements Key(inner_matcher) for the given argument pair type.
// Key(inner_matcher) matches an std::pair whose 'first' field matches
// inner_matcher.  For example, Contains(Key(Ge(5))) can be used to match an
// std::map that contains at least one element whose key is >= 5.
template <typename PairType>
class KeyMatcherImpl : public MatcherInterface<PairType> {
 public:
zhanyong.wan's avatar
zhanyong.wan committed
2700
  typedef GTEST_REMOVE_REFERENCE_AND_CONST_(PairType) RawPairType;
2701
2702
2703
2704
2705
2706
2707
2708
2709
  typedef typename RawPairType::first_type KeyType;

  template <typename InnerMatcher>
  explicit KeyMatcherImpl(InnerMatcher inner_matcher)
      : inner_matcher_(
          testing::SafeMatcherCast<const KeyType&>(inner_matcher)) {
  }

  // Returns true iff 'key_value.first' (the key) matches the inner matcher.
zhanyong.wan's avatar
zhanyong.wan committed
2710
2711
  virtual bool MatchAndExplain(PairType key_value,
                               MatchResultListener* listener) const {
2712
2713
2714
2715
2716
2717
2718
2719
    StringMatchResultListener inner_listener;
    const bool match = inner_matcher_.MatchAndExplain(key_value.first,
                                                      &inner_listener);
    const internal::string explanation = inner_listener.str();
    if (explanation != "") {
      *listener << "whose first field is a value " << explanation;
    }
    return match;
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
  }

  // Describes what this matcher does.
  virtual void DescribeTo(::std::ostream* os) const {
    *os << "has a key that ";
    inner_matcher_.DescribeTo(os);
  }

  // Describes what the negation of this matcher does.
  virtual void DescribeNegationTo(::std::ostream* os) const {
    *os << "doesn't have a key that ";
    inner_matcher_.DescribeTo(os);
  }

 private:
  const Matcher<const KeyType&> inner_matcher_;
2736
2737

  GTEST_DISALLOW_ASSIGN_(KeyMatcherImpl);
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
};

// Implements polymorphic Key(matcher_for_key).
template <typename M>
class KeyMatcher {
 public:
  explicit KeyMatcher(M m) : matcher_for_key_(m) {}

  template <typename PairType>
  operator Matcher<PairType>() const {
    return MakeMatcher(new KeyMatcherImpl<PairType>(matcher_for_key_));
  }

 private:
  const M matcher_for_key_;
2753
2754

  GTEST_DISALLOW_ASSIGN_(KeyMatcher);
2755
2756
};

2757
2758
2759
2760
2761
// Implements Pair(first_matcher, second_matcher) for the given argument pair
// type with its two matchers. See Pair() function below.
template <typename PairType>
class PairMatcherImpl : public MatcherInterface<PairType> {
 public:
zhanyong.wan's avatar
zhanyong.wan committed
2762
  typedef GTEST_REMOVE_REFERENCE_AND_CONST_(PairType) RawPairType;
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
  typedef typename RawPairType::first_type FirstType;
  typedef typename RawPairType::second_type SecondType;

  template <typename FirstMatcher, typename SecondMatcher>
  PairMatcherImpl(FirstMatcher first_matcher, SecondMatcher second_matcher)
      : first_matcher_(
            testing::SafeMatcherCast<const FirstType&>(first_matcher)),
        second_matcher_(
            testing::SafeMatcherCast<const SecondType&>(second_matcher)) {
  }

  // Describes what this matcher does.
  virtual void DescribeTo(::std::ostream* os) const {
    *os << "has a first field that ";
    first_matcher_.DescribeTo(os);
    *os << ", and has a second field that ";
    second_matcher_.DescribeTo(os);
  }

  // Describes what the negation of this matcher does.
  virtual void DescribeNegationTo(::std::ostream* os) const {
    *os << "has a first field that ";
    first_matcher_.DescribeNegationTo(os);
    *os << ", or has a second field that ";
    second_matcher_.DescribeNegationTo(os);
  }

zhanyong.wan's avatar
zhanyong.wan committed
2790
2791
2792
2793
  // Returns true iff 'a_pair.first' matches first_matcher and 'a_pair.second'
  // matches second_matcher.
  virtual bool MatchAndExplain(PairType a_pair,
                               MatchResultListener* listener) const {
2794
2795
2796
2797
2798
    if (!listener->IsInterested()) {
      // If the listener is not interested, we don't need to construct the
      // explanation.
      return first_matcher_.Matches(a_pair.first) &&
             second_matcher_.Matches(a_pair.second);
zhanyong.wan's avatar
zhanyong.wan committed
2799
    }
2800
2801
2802
2803
    StringMatchResultListener first_inner_listener;
    if (!first_matcher_.MatchAndExplain(a_pair.first,
                                        &first_inner_listener)) {
      *listener << "whose first field does not match";
2804
      PrintIfNotEmpty(first_inner_listener.str(), listener->stream());
zhanyong.wan's avatar
zhanyong.wan committed
2805
      return false;
2806
    }
2807
2808
2809
2810
    StringMatchResultListener second_inner_listener;
    if (!second_matcher_.MatchAndExplain(a_pair.second,
                                         &second_inner_listener)) {
      *listener << "whose second field does not match";
2811
      PrintIfNotEmpty(second_inner_listener.str(), listener->stream());
zhanyong.wan's avatar
zhanyong.wan committed
2812
      return false;
2813
    }
2814
2815
    ExplainSuccess(first_inner_listener.str(), second_inner_listener.str(),
                   listener);
zhanyong.wan's avatar
zhanyong.wan committed
2816
    return true;
2817
2818
2819
  }

 private:
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
  void ExplainSuccess(const internal::string& first_explanation,
                      const internal::string& second_explanation,
                      MatchResultListener* listener) const {
    *listener << "whose both fields match";
    if (first_explanation != "") {
      *listener << ", where the first field is a value " << first_explanation;
    }
    if (second_explanation != "") {
      *listener << ", ";
      if (first_explanation != "") {
        *listener << "and ";
      } else {
        *listener << "where ";
      }
      *listener << "the second field is a value " << second_explanation;
    }
  }

2838
2839
  const Matcher<const FirstType&> first_matcher_;
  const Matcher<const SecondType&> second_matcher_;
2840
2841

  GTEST_DISALLOW_ASSIGN_(PairMatcherImpl);
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
};

// Implements polymorphic Pair(first_matcher, second_matcher).
template <typename FirstMatcher, typename SecondMatcher>
class PairMatcher {
 public:
  PairMatcher(FirstMatcher first_matcher, SecondMatcher second_matcher)
      : first_matcher_(first_matcher), second_matcher_(second_matcher) {}

  template <typename PairType>
  operator Matcher<PairType> () const {
    return MakeMatcher(
        new PairMatcherImpl<PairType>(
            first_matcher_, second_matcher_));
  }

 private:
  const FirstMatcher first_matcher_;
  const SecondMatcher second_matcher_;
2861
2862

  GTEST_DISALLOW_ASSIGN_(PairMatcher);
2863
2864
};

2865
2866
2867
2868
// Implements ElementsAre() and ElementsAreArray().
template <typename Container>
class ElementsAreMatcherImpl : public MatcherInterface<Container> {
 public:
zhanyong.wan's avatar
zhanyong.wan committed
2869
  typedef GTEST_REMOVE_REFERENCE_AND_CONST_(Container) RawContainer;
2870
2871
2872
2873
2874
2875
2876
2877
  typedef internal::StlContainerView<RawContainer> View;
  typedef typename View::type StlContainer;
  typedef typename View::const_reference StlContainerReference;
  typedef typename StlContainer::value_type Element;

  // Constructs the matcher from a sequence of element values or
  // element matchers.
  template <typename InputIter>
2878
2879
2880
  ElementsAreMatcherImpl(InputIter first, InputIter last) {
    while (first != last) {
      matchers_.push_back(MatcherCast<const Element&>(*first++));
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
    }
  }

  // Describes what this matcher does.
  virtual void DescribeTo(::std::ostream* os) const {
    if (count() == 0) {
      *os << "is empty";
    } else if (count() == 1) {
      *os << "has 1 element that ";
      matchers_[0].DescribeTo(os);
    } else {
      *os << "has " << Elements(count()) << " where\n";
      for (size_t i = 0; i != count(); ++i) {
2894
        *os << "element #" << i << " ";
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
        matchers_[i].DescribeTo(os);
        if (i + 1 < count()) {
          *os << ",\n";
        }
      }
    }
  }

  // Describes what the negation of this matcher does.
  virtual void DescribeNegationTo(::std::ostream* os) const {
    if (count() == 0) {
2906
      *os << "isn't empty";
2907
2908
2909
      return;
    }

2910
    *os << "doesn't have " << Elements(count()) << ", or\n";
2911
    for (size_t i = 0; i != count(); ++i) {
2912
      *os << "element #" << i << " ";
2913
2914
2915
2916
2917
2918
2919
      matchers_[i].DescribeNegationTo(os);
      if (i + 1 < count()) {
        *os << ", or\n";
      }
    }
  }

zhanyong.wan's avatar
zhanyong.wan committed
2920
2921
  virtual bool MatchAndExplain(Container container,
                               MatchResultListener* listener) const {
2922
2923
2924
2925
2926
2927
2928
    // To work with stream-like "containers", we must only walk
    // through the elements in one pass.

    const bool listener_interested = listener->IsInterested();

    // explanations[i] is the explanation of the element at index i.
    ::std::vector<internal::string> explanations(count());
2929
    StlContainerReference stl_container = View::ConstReference(container);
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
    typename StlContainer::const_iterator it = stl_container.begin();
    size_t exam_pos = 0;
    bool mismatch_found = false;  // Have we found a mismatched element yet?

    // Go through the elements and matchers in pairs, until we reach
    // the end of either the elements or the matchers, or until we find a
    // mismatch.
    for (; it != stl_container.end() && exam_pos != count(); ++it, ++exam_pos) {
      bool match;  // Does the current element match the current matcher?
      if (listener_interested) {
        StringMatchResultListener s;
        match = matchers_[exam_pos].MatchAndExplain(*it, &s);
        explanations[exam_pos] = s.str();
      } else {
        match = matchers_[exam_pos].Matches(*it);
      }

      if (!match) {
        mismatch_found = true;
        break;
      }
    }
    // If mismatch_found is true, 'exam_pos' is the index of the mismatch.

    // Find how many elements the actual container has.  We avoid
    // calling size() s.t. this code works for stream-like "containers"
    // that don't define size().
    size_t actual_count = exam_pos;
    for (; it != stl_container.end(); ++it) {
      ++actual_count;
    }

zhanyong.wan's avatar
zhanyong.wan committed
2962
2963
2964
2965
2966
    if (actual_count != count()) {
      // The element count doesn't match.  If the container is empty,
      // there's no need to explain anything as Google Mock already
      // prints the empty container.  Otherwise we just need to show
      // how many elements there actually are.
2967
      if (listener_interested && (actual_count != 0)) {
2968
        *listener << "which has " << Elements(actual_count);
2969
      }
zhanyong.wan's avatar
zhanyong.wan committed
2970
2971
      return false;
    }
2972

2973
2974
2975
2976
2977
    if (mismatch_found) {
      // The element count matches, but the exam_pos-th element doesn't match.
      if (listener_interested) {
        *listener << "whose element #" << exam_pos << " doesn't match";
        PrintIfNotEmpty(explanations[exam_pos], listener->stream());
zhanyong.wan's avatar
zhanyong.wan committed
2978
      }
2979
      return false;
zhanyong.wan's avatar
zhanyong.wan committed
2980
    }
2981

zhanyong.wan's avatar
zhanyong.wan committed
2982
2983
    // Every element matches its expectation.  We need to explain why
    // (the obvious ones can be skipped).
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
    if (listener_interested) {
      bool reason_printed = false;
      for (size_t i = 0; i != count(); ++i) {
        const internal::string& s = explanations[i];
        if (!s.empty()) {
          if (reason_printed) {
            *listener << ",\nand ";
          }
          *listener << "whose element #" << i << " matches, " << s;
          reason_printed = true;
2994
2995
2996
        }
      }
    }
zhanyong.wan's avatar
zhanyong.wan committed
2997
    return true;
2998
2999
3000
3001
3002
3003
3004
3005
  }

 private:
  static Message Elements(size_t count) {
    return Message() << count << (count == 1 ? " element" : " elements");
  }

  size_t count() const { return matchers_.size(); }
3006
3007

  ::std::vector<Matcher<const Element&> > matchers_;
3008
3009

  GTEST_DISALLOW_ASSIGN_(ElementsAreMatcherImpl);
3010
3011
};

3012
3013
3014
3015
3016
// Connectivity matrix of (elements X matchers), in element-major order.
// Initially, there are no edges.
// Use NextGraph() to iterate over all possible edge configurations.
// Use Randomize() to generate a random edge configuration.
class GTEST_API_ MatchMatrix {
3017
 public:
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
  MatchMatrix(size_t num_elements, size_t num_matchers)
      : num_elements_(num_elements),
        num_matchers_(num_matchers),
        matched_(num_elements_* num_matchers_, 0) {
  }

  size_t LhsSize() const { return num_elements_; }
  size_t RhsSize() const { return num_matchers_; }
  bool HasEdge(size_t ilhs, size_t irhs) const {
    return matched_[SpaceIndex(ilhs, irhs)] == 1;
  }
  void SetEdge(size_t ilhs, size_t irhs, bool b) {
    matched_[SpaceIndex(ilhs, irhs)] = b ? 1 : 0;
  }

  // Treating the connectivity matrix as a (LhsSize()*RhsSize())-bit number,
  // adds 1 to that number; returns false if incrementing the graph left it
  // empty.
  bool NextGraph();

  void Randomize();

  string DebugString() const;

 private:
  size_t SpaceIndex(size_t ilhs, size_t irhs) const {
    return ilhs * num_matchers_ + irhs;
  }

  size_t num_elements_;
  size_t num_matchers_;

  // Each element is a char interpreted as bool. They are stored as a
  // flattened array in lhs-major order, use 'SpaceIndex()' to translate
  // a (ilhs, irhs) matrix coordinate into an offset.
  ::std::vector<char> matched_;
};

typedef ::std::pair<size_t, size_t> ElementMatcherPair;
typedef ::std::vector<ElementMatcherPair> ElementMatcherPairs;

// Returns a maximum bipartite matching for the specified graph 'g'.
// The matching is represented as a vector of {element, matcher} pairs.
GTEST_API_ ElementMatcherPairs
FindMaxBipartiteMatching(const MatchMatrix& g);

GTEST_API_ bool FindPairing(const MatchMatrix& matrix,
                            MatchResultListener* listener);

// Untyped base class for implementing UnorderedElementsAre.  By
// putting logic that's not specific to the element type here, we
// reduce binary bloat and increase compilation speed.
class GTEST_API_ UnorderedElementsAreMatcherImplBase {
 protected:
  // A vector of matcher describers, one for each element matcher.
  // Does not own the describers (and thus can be used only when the
  // element matchers are alive).
  typedef ::std::vector<const MatcherDescriberInterface*> MatcherDescriberVec;

  // Describes this UnorderedElementsAre matcher.
  void DescribeToImpl(::std::ostream* os) const;

  // Describes the negation of this UnorderedElementsAre matcher.
  void DescribeNegationToImpl(::std::ostream* os) const;

  bool VerifyAllElementsAndMatchersAreMatched(
      const ::std::vector<string>& element_printouts,
      const MatchMatrix& matrix,
      MatchResultListener* listener) const;

  MatcherDescriberVec& matcher_describers() {
    return matcher_describers_;
  }

  static Message Elements(size_t n) {
    return Message() << n << " element" << (n == 1 ? "" : "s");
  }

 private:
  MatcherDescriberVec matcher_describers_;

  GTEST_DISALLOW_ASSIGN_(UnorderedElementsAreMatcherImplBase);
};

// Implements unordered ElementsAre and unordered ElementsAreArray.
template <typename Container>
class UnorderedElementsAreMatcherImpl
    : public MatcherInterface<Container>,
      public UnorderedElementsAreMatcherImplBase {
 public:
  typedef GTEST_REMOVE_REFERENCE_AND_CONST_(Container) RawContainer;
  typedef internal::StlContainerView<RawContainer> View;
  typedef typename View::type StlContainer;
  typedef typename View::const_reference StlContainerReference;
  typedef typename StlContainer::const_iterator StlContainerConstIterator;
  typedef typename StlContainer::value_type Element;

  // Constructs the matcher from a sequence of element values or
  // element matchers.
  template <typename InputIter>
  UnorderedElementsAreMatcherImpl(InputIter first, InputIter last) {
    for (; first != last; ++first) {
      matchers_.push_back(MatcherCast<const Element&>(*first));
      matcher_describers().push_back(matchers_.back().GetDescriber());
    }
  }

  // Describes what this matcher does.
  virtual void DescribeTo(::std::ostream* os) const {
    return UnorderedElementsAreMatcherImplBase::DescribeToImpl(os);
  }

  // Describes what the negation of this matcher does.
  virtual void DescribeNegationTo(::std::ostream* os) const {
    return UnorderedElementsAreMatcherImplBase::DescribeNegationToImpl(os);
  }

  virtual bool MatchAndExplain(Container container,
                               MatchResultListener* listener) const {
    StlContainerReference stl_container = View::ConstReference(container);
3138
3139
3140
3141
3142
    ::std::vector<string> element_printouts;
    MatchMatrix matrix = AnalyzeElements(stl_container.begin(),
                                         stl_container.end(),
                                         &element_printouts,
                                         listener);
3143

3144
    const size_t actual_count = matrix.LhsSize();
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
    if (actual_count == 0 && matchers_.empty()) {
      return true;
    }
    if (actual_count != matchers_.size()) {
      // The element count doesn't match.  If the container is empty,
      // there's no need to explain anything as Google Mock already
      // prints the empty container. Otherwise we just need to show
      // how many elements there actually are.
      if (actual_count != 0 && listener->IsInterested()) {
        *listener << "which has " << Elements(actual_count);
      }
      return false;
    }

    return VerifyAllElementsAndMatchersAreMatched(element_printouts,
                                                  matrix, listener) &&
           FindPairing(matrix, listener);
  }

 private:
  typedef ::std::vector<Matcher<const Element&> > MatcherVec;

  template <typename ElementIter>
  MatchMatrix AnalyzeElements(ElementIter elem_first, ElementIter elem_last,
                              ::std::vector<string>* element_printouts,
                              MatchResultListener* listener) const {
3171
    element_printouts->clear();
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
    ::std::vector<char> did_match;
    size_t num_elements = 0;
    for (; elem_first != elem_last; ++num_elements, ++elem_first) {
      if (listener->IsInterested()) {
        element_printouts->push_back(PrintToString(*elem_first));
      }
      for (size_t irhs = 0; irhs != matchers_.size(); ++irhs) {
        did_match.push_back(Matches(matchers_[irhs])(*elem_first));
      }
    }

    MatchMatrix matrix(num_elements, matchers_.size());
    ::std::vector<char>::const_iterator did_match_iter = did_match.begin();
    for (size_t ilhs = 0; ilhs != num_elements; ++ilhs) {
      for (size_t irhs = 0; irhs != matchers_.size(); ++irhs) {
        matrix.SetEdge(ilhs, irhs, *did_match_iter++ != 0);
      }
    }
    return matrix;
  }

  MatcherVec matchers_;

  GTEST_DISALLOW_ASSIGN_(UnorderedElementsAreMatcherImpl);
};

// Functor for use in TransformTuple.
// Performs MatcherCast<Target> on an input argument of any type.
template <typename Target>
struct CastAndAppendTransform {
  template <typename Arg>
  Matcher<Target> operator()(const Arg& a) const {
    return MatcherCast<Target>(a);
  }
};

// Implements UnorderedElementsAre.
template <typename MatcherTuple>
class UnorderedElementsAreMatcher {
 public:
  explicit UnorderedElementsAreMatcher(const MatcherTuple& args)
      : matchers_(args) {}

  template <typename Container>
  operator Matcher<Container>() const {
    typedef GTEST_REMOVE_REFERENCE_AND_CONST_(Container) RawContainer;
    typedef typename internal::StlContainerView<RawContainer>::type View;
    typedef typename View::value_type Element;
    typedef ::std::vector<Matcher<const Element&> > MatcherVec;
    MatcherVec matchers;
    matchers.reserve(::std::tr1::tuple_size<MatcherTuple>::value);
    TransformTupleValues(CastAndAppendTransform<const Element&>(), matchers_,
                         ::std::back_inserter(matchers));
    return MakeMatcher(new UnorderedElementsAreMatcherImpl<Container>(
                           matchers.begin(), matchers.end()));
  }

 private:
  const MatcherTuple matchers_;
  GTEST_DISALLOW_ASSIGN_(UnorderedElementsAreMatcher);
};

// Implements ElementsAre.
template <typename MatcherTuple>
class ElementsAreMatcher {
 public:
  explicit ElementsAreMatcher(const MatcherTuple& args) : matchers_(args) {}
3239
3240
3241

  template <typename Container>
  operator Matcher<Container>() const {
zhanyong.wan's avatar
zhanyong.wan committed
3242
    typedef GTEST_REMOVE_REFERENCE_AND_CONST_(Container) RawContainer;
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
    typedef typename internal::StlContainerView<RawContainer>::type View;
    typedef typename View::value_type Element;
    typedef ::std::vector<Matcher<const Element&> > MatcherVec;
    MatcherVec matchers;
    matchers.reserve(::std::tr1::tuple_size<MatcherTuple>::value);
    TransformTupleValues(CastAndAppendTransform<const Element&>(), matchers_,
                         ::std::back_inserter(matchers));
    return MakeMatcher(new ElementsAreMatcherImpl<Container>(
                           matchers.begin(), matchers.end()));
  }

 private:
  const MatcherTuple matchers_;
  GTEST_DISALLOW_ASSIGN_(ElementsAreMatcher);
};
3258

3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
// Implements UnorderedElementsAreArray().
template <typename T>
class UnorderedElementsAreArrayMatcher {
 public:
  UnorderedElementsAreArrayMatcher() {}

  template <typename Iter>
  UnorderedElementsAreArrayMatcher(Iter first, Iter last)
      : matchers_(first, last) {}

  template <typename Container>
  operator Matcher<Container>() const {
    return MakeMatcher(
        new UnorderedElementsAreMatcherImpl<Container>(matchers_.begin(),
                                                       matchers_.end()));
3274
  }
3275
3276
3277
3278
3279

 private:
  ::std::vector<T> matchers_;

  GTEST_DISALLOW_ASSIGN_(UnorderedElementsAreArrayMatcher);
3280
3281
3282
3283
3284
3285
};

// Implements ElementsAreArray().
template <typename T>
class ElementsAreArrayMatcher {
 public:
3286
3287
  template <typename Iter>
  ElementsAreArrayMatcher(Iter first, Iter last) : matchers_(first, last) {}
3288
3289
3290

  template <typename Container>
  operator Matcher<Container>() const {
3291
3292
    return MakeMatcher(new ElementsAreMatcherImpl<Container>(
        matchers_.begin(), matchers_.end()));
3293
3294
3295
  }

 private:
3296
  const ::std::vector<T> matchers_;
3297
3298

  GTEST_DISALLOW_ASSIGN_(ElementsAreArrayMatcher);
3299
3300
};

3301
3302
3303
3304
3305
// Returns the description for a matcher defined using the MATCHER*()
// macro where the user-supplied description string is "", if
// 'negation' is false; otherwise returns the description of the
// negation of the matcher.  'param_values' contains a list of strings
// that are the print-out of the matcher's parameters.
3306
3307
3308
GTEST_API_ string FormatMatcherDescription(bool negation,
                                           const char* matcher_name,
                                           const Strings& param_values);
3309

3310
3311
}  // namespace internal

3312
3313
3314
3315
// ElementsAreArray(first, last)
// ElementsAreArray(pointer, count)
// ElementsAreArray(array)
// ElementsAreArray(vector)
3316
// ElementsAreArray({ e1, e2, ..., en })
3317
//
3318
3319
3320
3321
3322
3323
// The ElementsAreArray() functions are like ElementsAre(...), except
// that they are given a homogeneous sequence rather than taking each
// element as a function argument. The sequence can be specified as an
// array, a pointer and count, a vector, an initializer list, or an
// STL iterator range. In each of these cases, the underlying sequence
// can be either a sequence of values or a sequence of matchers.
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
//
// All forms of ElementsAreArray() make a copy of the input matcher sequence.

template <typename Iter>
inline internal::ElementsAreArrayMatcher<
    typename ::std::iterator_traits<Iter>::value_type>
ElementsAreArray(Iter first, Iter last) {
  typedef typename ::std::iterator_traits<Iter>::value_type T;
  return internal::ElementsAreArrayMatcher<T>(first, last);
}

template <typename T>
inline internal::ElementsAreArrayMatcher<T> ElementsAreArray(
    const T* pointer, size_t count) {
  return ElementsAreArray(pointer, pointer + count);
}

template <typename T, size_t N>
inline internal::ElementsAreArrayMatcher<T> ElementsAreArray(
    const T (&array)[N]) {
  return ElementsAreArray(array, N);
}

template <typename T, typename A>
inline internal::ElementsAreArrayMatcher<T> ElementsAreArray(
    const ::std::vector<T, A>& vec) {
  return ElementsAreArray(vec.begin(), vec.end());
}

3353
3354
3355
3356
3357
3358
3359
3360
#if GTEST_LANG_CXX11
template <typename T>
inline internal::ElementsAreArrayMatcher<T>
ElementsAreArray(::std::initializer_list<T> xs) {
  return ElementsAreArray(xs.begin(), xs.end());
}
#endif

3361
3362
3363
3364
// UnorderedElementsAreArray(first, last)
// UnorderedElementsAreArray(pointer, count)
// UnorderedElementsAreArray(array)
// UnorderedElementsAreArray(vector)
3365
// UnorderedElementsAreArray({ e1, e2, ..., en })
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
//
// The UnorderedElementsAreArray() functions are like
// ElementsAreArray(...), but allow matching the elements in any order.
template <typename Iter>
inline internal::UnorderedElementsAreArrayMatcher<
    typename ::std::iterator_traits<Iter>::value_type>
UnorderedElementsAreArray(Iter first, Iter last) {
  typedef typename ::std::iterator_traits<Iter>::value_type T;
  return internal::UnorderedElementsAreArrayMatcher<T>(first, last);
}

template <typename T>
inline internal::UnorderedElementsAreArrayMatcher<T>
UnorderedElementsAreArray(const T* pointer, size_t count) {
  return UnorderedElementsAreArray(pointer, pointer + count);
}

template <typename T, size_t N>
inline internal::UnorderedElementsAreArrayMatcher<T>
UnorderedElementsAreArray(const T (&array)[N]) {
  return UnorderedElementsAreArray(array, N);
}

template <typename T, typename A>
inline internal::UnorderedElementsAreArrayMatcher<T>
UnorderedElementsAreArray(const ::std::vector<T, A>& vec) {
  return UnorderedElementsAreArray(vec.begin(), vec.end());
}

3395
3396
3397
3398
3399
3400
3401
#if GTEST_LANG_CXX11
template <typename T>
inline internal::UnorderedElementsAreArrayMatcher<T>
UnorderedElementsAreArray(::std::initializer_list<T> xs) {
  return UnorderedElementsAreArray(xs.begin(), xs.end());
}
#endif
3402

3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
// _ is a matcher that matches anything of any type.
//
// This definition is fine as:
//
//   1. The C++ standard permits using the name _ in a namespace that
//      is not the global namespace or ::std.
//   2. The AnythingMatcher class has no data member or constructor,
//      so it's OK to create global variables of this type.
//   3. c-style has approved of using _ in this case.
const internal::AnythingMatcher _ = {};
// Creates a matcher that matches any value of the given type T.
template <typename T>
inline Matcher<T> A() { return MakeMatcher(new internal::AnyMatcherImpl<T>()); }

// Creates a matcher that matches any value of the given type T.
template <typename T>
inline Matcher<T> An() { return A<T>(); }

// Creates a polymorphic matcher that matches anything equal to x.
// Note: if the parameter of Eq() were declared as const T&, Eq("foo")
// wouldn't compile.
template <typename T>
inline internal::EqMatcher<T> Eq(T x) { return internal::EqMatcher<T>(x); }

// Constructs a Matcher<T> from a 'value' of type T.  The constructed
// matcher matches any value that's equal to 'value'.
template <typename T>
Matcher<T>::Matcher(T value) { *this = Eq(value); }

// Creates a monomorphic matcher that matches anything with type Lhs
// and equal to rhs.  A user may need to use this instead of Eq(...)
// in order to resolve an overloading ambiguity.
//
// TypedEq<T>(x) is just a convenient short-hand for Matcher<T>(Eq(x))
// or Matcher<T>(x), but more readable than the latter.
//
// We could define similar monomorphic matchers for other comparison
// operations (e.g. TypedLt, TypedGe, and etc), but decided not to do
// it yet as those are used much less than Eq() in practice.  A user
// can always write Matcher<T>(Lt(5)) to be explicit about the type,
// for example.
template <typename Lhs, typename Rhs>
inline Matcher<Lhs> TypedEq(const Rhs& rhs) { return Eq(rhs); }

// Creates a polymorphic matcher that matches anything >= x.
template <typename Rhs>
inline internal::GeMatcher<Rhs> Ge(Rhs x) {
  return internal::GeMatcher<Rhs>(x);
}

// Creates a polymorphic matcher that matches anything > x.
template <typename Rhs>
inline internal::GtMatcher<Rhs> Gt(Rhs x) {
  return internal::GtMatcher<Rhs>(x);
}

// Creates a polymorphic matcher that matches anything <= x.
template <typename Rhs>
inline internal::LeMatcher<Rhs> Le(Rhs x) {
  return internal::LeMatcher<Rhs>(x);
}

// Creates a polymorphic matcher that matches anything < x.
template <typename Rhs>
inline internal::LtMatcher<Rhs> Lt(Rhs x) {
  return internal::LtMatcher<Rhs>(x);
}

// Creates a polymorphic matcher that matches anything != x.
template <typename Rhs>
inline internal::NeMatcher<Rhs> Ne(Rhs x) {
  return internal::NeMatcher<Rhs>(x);
}

zhanyong.wan's avatar
zhanyong.wan committed
3477
3478
3479
3480
3481
// Creates a polymorphic matcher that matches any NULL pointer.
inline PolymorphicMatcher<internal::IsNullMatcher > IsNull() {
  return MakePolymorphicMatcher(internal::IsNullMatcher());
}

3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
// Creates a polymorphic matcher that matches any non-NULL pointer.
// This is convenient as Not(NULL) doesn't compile (the compiler
// thinks that that expression is comparing a pointer with an integer).
inline PolymorphicMatcher<internal::NotNullMatcher > NotNull() {
  return MakePolymorphicMatcher(internal::NotNullMatcher());
}

// Creates a polymorphic matcher that matches any argument that
// references variable x.
template <typename T>
inline internal::RefMatcher<T&> Ref(T& x) {  // NOLINT
  return internal::RefMatcher<T&>(x);
}

// Creates a matcher that matches any double argument approximately
// equal to rhs, where two NANs are considered unequal.
inline internal::FloatingEqMatcher<double> DoubleEq(double rhs) {
  return internal::FloatingEqMatcher<double>(rhs, false);
}

// Creates a matcher that matches any double argument approximately
// equal to rhs, including NaN values when rhs is NaN.
inline internal::FloatingEqMatcher<double> NanSensitiveDoubleEq(double rhs) {
  return internal::FloatingEqMatcher<double>(rhs, true);
}

3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
// Creates a matcher that matches any double argument approximately equal to
// rhs, up to the specified max absolute error bound, where two NANs are
// considered unequal.  The max absolute error bound must be non-negative.
inline internal::FloatingEqMatcher<double> DoubleNear(
    double rhs, double max_abs_error) {
  return internal::FloatingEqMatcher<double>(rhs, false, max_abs_error);
}

// Creates a matcher that matches any double argument approximately equal to
// rhs, up to the specified max absolute error bound, including NaN values when
// rhs is NaN.  The max absolute error bound must be non-negative.
inline internal::FloatingEqMatcher<double> NanSensitiveDoubleNear(
    double rhs, double max_abs_error) {
  return internal::FloatingEqMatcher<double>(rhs, true, max_abs_error);
}

3524
3525
3526
3527
3528
3529
// Creates a matcher that matches any float argument approximately
// equal to rhs, where two NANs are considered unequal.
inline internal::FloatingEqMatcher<float> FloatEq(float rhs) {
  return internal::FloatingEqMatcher<float>(rhs, false);
}

3530
// Creates a matcher that matches any float argument approximately
3531
3532
3533
3534
3535
// equal to rhs, including NaN values when rhs is NaN.
inline internal::FloatingEqMatcher<float> NanSensitiveFloatEq(float rhs) {
  return internal::FloatingEqMatcher<float>(rhs, true);
}

3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
// Creates a matcher that matches any float argument approximately equal to
// rhs, up to the specified max absolute error bound, where two NANs are
// considered unequal.  The max absolute error bound must be non-negative.
inline internal::FloatingEqMatcher<float> FloatNear(
    float rhs, float max_abs_error) {
  return internal::FloatingEqMatcher<float>(rhs, false, max_abs_error);
}

// Creates a matcher that matches any float argument approximately equal to
// rhs, up to the specified max absolute error bound, including NaN values when
// rhs is NaN.  The max absolute error bound must be non-negative.
inline internal::FloatingEqMatcher<float> NanSensitiveFloatNear(
    float rhs, float max_abs_error) {
  return internal::FloatingEqMatcher<float>(rhs, true, max_abs_error);
}

3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
// Creates a matcher that matches a pointer (raw or smart) that points
// to a value that matches inner_matcher.
template <typename InnerMatcher>
inline internal::PointeeMatcher<InnerMatcher> Pointee(
    const InnerMatcher& inner_matcher) {
  return internal::PointeeMatcher<InnerMatcher>(inner_matcher);
}

// Creates a matcher that matches an object whose given field matches
// 'matcher'.  For example,
//   Field(&Foo::number, Ge(5))
// matches a Foo object x iff x.number >= 5.
template <typename Class, typename FieldType, typename FieldMatcher>
inline PolymorphicMatcher<
  internal::FieldMatcher<Class, FieldType> > Field(
    FieldType Class::*field, const FieldMatcher& matcher) {
  return MakePolymorphicMatcher(
      internal::FieldMatcher<Class, FieldType>(
          field, MatcherCast<const FieldType&>(matcher)));
  // The call to MatcherCast() is required for supporting inner
  // matchers of compatible types.  For example, it allows
  //   Field(&Foo::bar, m)
  // to compile where bar is an int32 and m is a matcher for int64.
}

// Creates a matcher that matches an object whose given property
// matches 'matcher'.  For example,
//   Property(&Foo::str, StartsWith("hi"))
// matches a Foo object x iff x.str() starts with "hi".
template <typename Class, typename PropertyType, typename PropertyMatcher>
inline PolymorphicMatcher<
  internal::PropertyMatcher<Class, PropertyType> > Property(
    PropertyType (Class::*property)() const, const PropertyMatcher& matcher) {
  return MakePolymorphicMatcher(
      internal::PropertyMatcher<Class, PropertyType>(
          property,
3588
          MatcherCast<GTEST_REFERENCE_TO_CONST_(PropertyType)>(matcher)));
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
  // The call to MatcherCast() is required for supporting inner
  // matchers of compatible types.  For example, it allows
  //   Property(&Foo::bar, m)
  // to compile where bar() returns an int32 and m is a matcher for int64.
}

// Creates a matcher that matches an object iff the result of applying
// a callable to x matches 'matcher'.
// For example,
//   ResultOf(f, StartsWith("hi"))
// matches a Foo object x iff f(x) starts with "hi".
// callable parameter can be a function, function pointer, or a functor.
// Callable has to satisfy the following conditions:
//   * It is required to keep no state affecting the results of
//     the calls on it and make no assumptions about how many calls
//     will be made. Any state it keeps must be protected from the
//     concurrent access.
//   * If it is a function object, it has to define type result_type.
//     We recommend deriving your functor classes from std::unary_function.
template <typename Callable, typename ResultOfMatcher>
internal::ResultOfMatcher<Callable> ResultOf(
    Callable callable, const ResultOfMatcher& matcher) {
  return internal::ResultOfMatcher<Callable>(
          callable,
          MatcherCast<typename internal::CallableTraits<Callable>::ResultType>(
              matcher));
  // The call to MatcherCast() is required for supporting inner
  // matchers of compatible types.  For example, it allows
  //   ResultOf(Function, m)
  // to compile where Function() returns an int32 and m is a matcher for int64.
}

// String matchers.

// Matches a string equal to str.
inline PolymorphicMatcher<internal::StrEqualityMatcher<internal::string> >
    StrEq(const internal::string& str) {
  return MakePolymorphicMatcher(internal::StrEqualityMatcher<internal::string>(
      str, true, true));
}

// Matches a string not equal to str.
inline PolymorphicMatcher<internal::StrEqualityMatcher<internal::string> >
    StrNe(const internal::string& str) {
  return MakePolymorphicMatcher(internal::StrEqualityMatcher<internal::string>(
      str, false, true));
}

// Matches a string equal to str, ignoring case.
inline PolymorphicMatcher<internal::StrEqualityMatcher<internal::string> >
    StrCaseEq(const internal::string& str) {
  return MakePolymorphicMatcher(internal::StrEqualityMatcher<internal::string>(
      str, true, false));
}

// Matches a string not equal to str, ignoring case.
inline PolymorphicMatcher<internal::StrEqualityMatcher<internal::string> >
    StrCaseNe(const internal::string& str) {
  return MakePolymorphicMatcher(internal::StrEqualityMatcher<internal::string>(
      str, false, false));
}

// Creates a matcher that matches any string, std::string, or C string
// that contains the given substring.
inline PolymorphicMatcher<internal::HasSubstrMatcher<internal::string> >
    HasSubstr(const internal::string& substring) {
  return MakePolymorphicMatcher(internal::HasSubstrMatcher<internal::string>(
      substring));
}

// Matches a string that starts with 'prefix' (case-sensitive).
inline PolymorphicMatcher<internal::StartsWithMatcher<internal::string> >
    StartsWith(const internal::string& prefix) {
  return MakePolymorphicMatcher(internal::StartsWithMatcher<internal::string>(
      prefix));
}

// Matches a string that ends with 'suffix' (case-sensitive).
inline PolymorphicMatcher<internal::EndsWithMatcher<internal::string> >
    EndsWith(const internal::string& suffix) {
  return MakePolymorphicMatcher(internal::EndsWithMatcher<internal::string>(
      suffix));
}

// Matches a string that fully matches regular expression 'regex'.
// The matcher takes ownership of 'regex'.
inline PolymorphicMatcher<internal::MatchesRegexMatcher> MatchesRegex(
    const internal::RE* regex) {
  return MakePolymorphicMatcher(internal::MatchesRegexMatcher(regex, true));
}
inline PolymorphicMatcher<internal::MatchesRegexMatcher> MatchesRegex(
    const internal::string& regex) {
  return MatchesRegex(new internal::RE(regex));
}

// Matches a string that contains regular expression 'regex'.
// The matcher takes ownership of 'regex'.
inline PolymorphicMatcher<internal::MatchesRegexMatcher> ContainsRegex(
    const internal::RE* regex) {
  return MakePolymorphicMatcher(internal::MatchesRegexMatcher(regex, false));
}
inline PolymorphicMatcher<internal::MatchesRegexMatcher> ContainsRegex(
    const internal::string& regex) {
  return ContainsRegex(new internal::RE(regex));
}

#if GTEST_HAS_GLOBAL_WSTRING || GTEST_HAS_STD_WSTRING
// Wide string matchers.

// Matches a string equal to str.
inline PolymorphicMatcher<internal::StrEqualityMatcher<internal::wstring> >
    StrEq(const internal::wstring& str) {
  return MakePolymorphicMatcher(internal::StrEqualityMatcher<internal::wstring>(
      str, true, true));
}

// Matches a string not equal to str.
inline PolymorphicMatcher<internal::StrEqualityMatcher<internal::wstring> >
    StrNe(const internal::wstring& str) {
  return MakePolymorphicMatcher(internal::StrEqualityMatcher<internal::wstring>(
      str, false, true));
}

// Matches a string equal to str, ignoring case.
inline PolymorphicMatcher<internal::StrEqualityMatcher<internal::wstring> >
    StrCaseEq(const internal::wstring& str) {
  return MakePolymorphicMatcher(internal::StrEqualityMatcher<internal::wstring>(
      str, true, false));
}

// Matches a string not equal to str, ignoring case.
inline PolymorphicMatcher<internal::StrEqualityMatcher<internal::wstring> >
    StrCaseNe(const internal::wstring& str) {
  return MakePolymorphicMatcher(internal::StrEqualityMatcher<internal::wstring>(
      str, false, false));
}

// Creates a matcher that matches any wstring, std::wstring, or C wide string
// that contains the given substring.
inline PolymorphicMatcher<internal::HasSubstrMatcher<internal::wstring> >
    HasSubstr(const internal::wstring& substring) {
  return MakePolymorphicMatcher(internal::HasSubstrMatcher<internal::wstring>(
      substring));
}

// Matches a string that starts with 'prefix' (case-sensitive).
inline PolymorphicMatcher<internal::StartsWithMatcher<internal::wstring> >
    StartsWith(const internal::wstring& prefix) {
  return MakePolymorphicMatcher(internal::StartsWithMatcher<internal::wstring>(
      prefix));
}

// Matches a string that ends with 'suffix' (case-sensitive).
inline PolymorphicMatcher<internal::EndsWithMatcher<internal::wstring> >
    EndsWith(const internal::wstring& suffix) {
  return MakePolymorphicMatcher(internal::EndsWithMatcher<internal::wstring>(
      suffix));
}

#endif  // GTEST_HAS_GLOBAL_WSTRING || GTEST_HAS_STD_WSTRING

// Creates a polymorphic matcher that matches a 2-tuple where the
// first field == the second field.
inline internal::Eq2Matcher Eq() { return internal::Eq2Matcher(); }

// Creates a polymorphic matcher that matches a 2-tuple where the
// first field >= the second field.
inline internal::Ge2Matcher Ge() { return internal::Ge2Matcher(); }

// Creates a polymorphic matcher that matches a 2-tuple where the
// first field > the second field.
inline internal::Gt2Matcher Gt() { return internal::Gt2Matcher(); }

// Creates a polymorphic matcher that matches a 2-tuple where the
// first field <= the second field.
inline internal::Le2Matcher Le() { return internal::Le2Matcher(); }

// Creates a polymorphic matcher that matches a 2-tuple where the
// first field < the second field.
inline internal::Lt2Matcher Lt() { return internal::Lt2Matcher(); }

// Creates a polymorphic matcher that matches a 2-tuple where the
// first field != the second field.
inline internal::Ne2Matcher Ne() { return internal::Ne2Matcher(); }

// Creates a matcher that matches any value of type T that m doesn't
// match.
template <typename InnerMatcher>
inline internal::NotMatcher<InnerMatcher> Not(InnerMatcher m) {
  return internal::NotMatcher<InnerMatcher>(m);
}

// Returns a matcher that matches anything that satisfies the given
// predicate.  The predicate can be any unary function or functor
// whose return type can be implicitly converted to bool.
template <typename Predicate>
inline PolymorphicMatcher<internal::TrulyMatcher<Predicate> >
Truly(Predicate pred) {
  return MakePolymorphicMatcher(internal::TrulyMatcher<Predicate>(pred));
}

zhanyong.wan's avatar
zhanyong.wan committed
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
// Returns a matcher that matches the container size. The container must
// support both size() and size_type which all STL-like containers provide.
// Note that the parameter 'size' can be a value of type size_type as well as
// matcher. For instance:
//   EXPECT_THAT(container, SizeIs(2));     // Checks container has 2 elements.
//   EXPECT_THAT(container, SizeIs(Le(2));  // Checks container has at most 2.
template <typename SizeMatcher>
inline internal::SizeIsMatcher<SizeMatcher>
SizeIs(const SizeMatcher& size_matcher) {
  return internal::SizeIsMatcher<SizeMatcher>(size_matcher);
}

zhanyong.wan's avatar
zhanyong.wan committed
3802
3803
3804
3805
3806
// Returns a matcher that matches an equal container.
// This matcher behaves like Eq(), but in the event of mismatch lists the
// values that are included in one container but not the other. (Duplicate
// values and order differences are not explained.)
template <typename Container>
zhanyong.wan's avatar
zhanyong.wan committed
3807
inline PolymorphicMatcher<internal::ContainerEqMatcher<  // NOLINT
3808
                            GTEST_REMOVE_CONST_(Container)> >
zhanyong.wan's avatar
zhanyong.wan committed
3809
    ContainerEq(const Container& rhs) {
3810
3811
  // This following line is for working around a bug in MSVC 8.0,
  // which causes Container to be a const type sometimes.
3812
  typedef GTEST_REMOVE_CONST_(Container) RawContainer;
zhanyong.wan's avatar
zhanyong.wan committed
3813
3814
  return MakePolymorphicMatcher(
      internal::ContainerEqMatcher<RawContainer>(rhs));
3815
3816
}

3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
// Returns a matcher that matches a container that, when sorted using
// the given comparator, matches container_matcher.
template <typename Comparator, typename ContainerMatcher>
inline internal::WhenSortedByMatcher<Comparator, ContainerMatcher>
WhenSortedBy(const Comparator& comparator,
             const ContainerMatcher& container_matcher) {
  return internal::WhenSortedByMatcher<Comparator, ContainerMatcher>(
      comparator, container_matcher);
}

// Returns a matcher that matches a container that, when sorted using
// the < operator, matches container_matcher.
template <typename ContainerMatcher>
inline internal::WhenSortedByMatcher<internal::LessComparator, ContainerMatcher>
WhenSorted(const ContainerMatcher& container_matcher) {
  return
      internal::WhenSortedByMatcher<internal::LessComparator, ContainerMatcher>(
          internal::LessComparator(), container_matcher);
}

zhanyong.wan's avatar
zhanyong.wan committed
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
// Matches an STL-style container or a native array that contains the
// same number of elements as in rhs, where its i-th element and rhs's
// i-th element (as a pair) satisfy the given pair matcher, for all i.
// TupleMatcher must be able to be safely cast to Matcher<tuple<const
// T1&, const T2&> >, where T1 and T2 are the types of elements in the
// LHS container and the RHS container respectively.
template <typename TupleMatcher, typename Container>
inline internal::PointwiseMatcher<TupleMatcher,
                                  GTEST_REMOVE_CONST_(Container)>
Pointwise(const TupleMatcher& tuple_matcher, const Container& rhs) {
  // This following line is for working around a bug in MSVC 8.0,
  // which causes Container to be a const type sometimes.
  typedef GTEST_REMOVE_CONST_(Container) RawContainer;
  return internal::PointwiseMatcher<TupleMatcher, RawContainer>(
      tuple_matcher, rhs);
}

3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
// Matches an STL-style container or a native array that contains at
// least one element matching the given value or matcher.
//
// Examples:
//   ::std::set<int> page_ids;
//   page_ids.insert(3);
//   page_ids.insert(1);
//   EXPECT_THAT(page_ids, Contains(1));
//   EXPECT_THAT(page_ids, Contains(Gt(2)));
//   EXPECT_THAT(page_ids, Not(Contains(4)));
//
//   ::std::map<int, size_t> page_lengths;
//   page_lengths[1] = 100;
zhanyong.wan's avatar
zhanyong.wan committed
3867
3868
//   EXPECT_THAT(page_lengths,
//               Contains(::std::pair<const int, size_t>(1, 100)));
3869
3870
3871
3872
3873
3874
//
//   const char* user_ids[] = { "joe", "mike", "tom" };
//   EXPECT_THAT(user_ids, Contains(Eq(::std::string("tom"))));
template <typename M>
inline internal::ContainsMatcher<M> Contains(M matcher) {
  return internal::ContainsMatcher<M>(matcher);
zhanyong.wan's avatar
zhanyong.wan committed
3875
3876
}

3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
// Matches an STL-style container or a native array that contains only
// elements matching the given value or matcher.
//
// Each(m) is semantically equivalent to Not(Contains(Not(m))). Only
// the messages are different.
//
// Examples:
//   ::std::set<int> page_ids;
//   // Each(m) matches an empty container, regardless of what m is.
//   EXPECT_THAT(page_ids, Each(Eq(1)));
//   EXPECT_THAT(page_ids, Each(Eq(77)));
//
//   page_ids.insert(3);
//   EXPECT_THAT(page_ids, Each(Gt(0)));
//   EXPECT_THAT(page_ids, Not(Each(Gt(4))));
//   page_ids.insert(1);
//   EXPECT_THAT(page_ids, Not(Each(Lt(2))));
//
//   ::std::map<int, size_t> page_lengths;
//   page_lengths[1] = 100;
//   page_lengths[2] = 200;
//   page_lengths[3] = 300;
//   EXPECT_THAT(page_lengths, Not(Each(Pair(1, 100))));
//   EXPECT_THAT(page_lengths, Each(Key(Le(3))));
//
//   const char* user_ids[] = { "joe", "mike", "tom" };
//   EXPECT_THAT(user_ids, Not(Each(Eq(::std::string("tom")))));
template <typename M>
inline internal::EachMatcher<M> Each(M matcher) {
  return internal::EachMatcher<M>(matcher);
}

3909
3910
3911
3912
3913
3914
3915
3916
// Key(inner_matcher) matches an std::pair whose 'first' field matches
// inner_matcher.  For example, Contains(Key(Ge(5))) can be used to match an
// std::map that contains at least one element whose key is >= 5.
template <typename M>
inline internal::KeyMatcher<M> Key(M inner_matcher) {
  return internal::KeyMatcher<M>(inner_matcher);
}

3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
// Pair(first_matcher, second_matcher) matches a std::pair whose 'first' field
// matches first_matcher and whose 'second' field matches second_matcher.  For
// example, EXPECT_THAT(map_type, ElementsAre(Pair(Ge(5), "foo"))) can be used
// to match a std::map<int, string> that contains exactly one element whose key
// is >= 5 and whose value equals "foo".
template <typename FirstMatcher, typename SecondMatcher>
inline internal::PairMatcher<FirstMatcher, SecondMatcher>
Pair(FirstMatcher first_matcher, SecondMatcher second_matcher) {
  return internal::PairMatcher<FirstMatcher, SecondMatcher>(
      first_matcher, second_matcher);
}

3929
3930
3931
3932
3933
3934
3935
// Returns a predicate that is satisfied by anything that matches the
// given matcher.
template <typename M>
inline internal::MatcherAsPredicate<M> Matches(M matcher) {
  return internal::MatcherAsPredicate<M>(matcher);
}

3936
3937
3938
3939
3940
3941
// Returns true iff the value matches the matcher.
template <typename T, typename M>
inline bool Value(const T& value, M matcher) {
  return testing::Matches(matcher)(value);
}

3942
3943
3944
// Matches the value against the given matcher and explains the match
// result to listener.
template <typename T, typename M>
3945
inline bool ExplainMatchResult(
3946
3947
3948
3949
    M matcher, const T& value, MatchResultListener* listener) {
  return SafeMatcherCast<const T&>(matcher).MatchAndExplain(value, listener);
}

3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
#if GTEST_LANG_CXX11
// Define variadic matcher versions. They are overloaded in
// gmock-generated-matchers.h for the cases supported by pre C++11 compilers.
template <typename... Args>
inline internal::AllOfMatcher<Args...> AllOf(const Args&... matchers) {
  return internal::AllOfMatcher<Args...>(matchers...);
}

template <typename... Args>
inline internal::AnyOfMatcher<Args...> AnyOf(const Args&... matchers) {
  return internal::AnyOfMatcher<Args...>(matchers...);
}

#endif  // GTEST_LANG_CXX11

3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
// AllArgs(m) is a synonym of m.  This is useful in
//
//   EXPECT_CALL(foo, Bar(_, _)).With(AllArgs(Eq()));
//
// which is easier to read than
//
//   EXPECT_CALL(foo, Bar(_, _)).With(Eq());
template <typename InnerMatcher>
inline InnerMatcher AllArgs(const InnerMatcher& matcher) { return matcher; }

3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
// These macros allow using matchers to check values in Google Test
// tests.  ASSERT_THAT(value, matcher) and EXPECT_THAT(value, matcher)
// succeed iff the value matches the matcher.  If the assertion fails,
// the value and the description of the matcher will be printed.
#define ASSERT_THAT(value, matcher) ASSERT_PRED_FORMAT1(\
    ::testing::internal::MakePredicateFormatterFromMatcher(matcher), value)
#define EXPECT_THAT(value, matcher) EXPECT_PRED_FORMAT1(\
    ::testing::internal::MakePredicateFormatterFromMatcher(matcher), value)

}  // namespace testing

#endif  // GMOCK_INCLUDE_GMOCK_GMOCK_MATCHERS_H_