restore mistakenly removed iffs in their explicit form

Due to confusion arisen from "iff" standing for "if and only if",
this commit uses the latter.

googlemock/docs/cheat_sheet.md

@@ -731,12 +731,12 @@ you can do it earlier:
 using ::testing::Mock;
 ...
 // Verifies and removes the expectations on mock_obj;
-// returns true if successful.
+// returns true if and only if successful.
 Mock::VerifyAndClearExpectations(&mock_obj);
 ...
 // Verifies and removes the expectations on mock_obj;
 // also removes the default actions set by ON_CALL();
-// returns true if successful.
+// returns true if and only if successful.
 Mock::VerifyAndClear(&mock_obj);
 ```
 

googlemock/docs/cook_book.md

@@ -1270,7 +1270,8 @@ what if you want to make sure the value *pointed to* by the pointer, instead of
 the pointer itself, has a certain property? Well, you can use the `Pointee(m)`
 matcher.
 
-`Pointee(m)` matches a pointer if `m` matches the value the pointer points to.
+`Pointee(m)` matches a pointer if and only if `m` matches the value the pointer
+points to.
 For example:
 
 ```cpp
@@ -3573,7 +3574,7 @@ class MatcherInterface {
  public:
   virtual ~MatcherInterface();
 
-  // Returns true if the matcher matches x; also explains the match
+  // Returns true if and only if the matcher matches x; also explains the match
   // result to 'listener'.
   virtual bool MatchAndExplain(T x, MatchResultListener* listener) const = 0;
 
@@ -3727,10 +3728,11 @@ class CardinalityInterface {
  public:
   virtual ~CardinalityInterface();
 
-  // Returns true if call_count calls will satisfy this cardinality.
+  // Returns true if and only if call_count calls will satisfy this cardinality.
   virtual bool IsSatisfiedByCallCount(int call_count) const = 0;
 
-  // Returns true if call_count calls will saturate this cardinality.
+  // Returns true if and only if call_count calls will saturate this
+  // cardinality.
   virtual bool IsSaturatedByCallCount(int call_count) const = 0;
 
   // Describes self to an ostream.

googlemock/include/gmock/gmock-actions.h

@@ -99,7 +99,8 @@ struct BuiltInDefaultValueGetter<T, false> {
 template <typename T>
 class BuiltInDefaultValue {
  public:
-  // This function returns true if type T has a built-in default value.
+  // This function returns true if and only if type T has a built-in default
+  // value.
   static bool Exists() {
     return ::std::is_default_constructible<T>::value;
   }
@@ -208,7 +209,7 @@ class DefaultValue {
     producer_ = nullptr;
   }
 
-  // Returns true if the user has set the default value for type T.
+  // Returns true if and only if the user has set the default value for type T.
   static bool IsSet() { return producer_ != nullptr; }
 
   // Returns true if T has a default return value set by the user or there
@@ -269,7 +270,7 @@ class DefaultValue<T&> {
   // Unsets the default value for type T&.
   static void Clear() { address_ = nullptr; }
 
-  // Returns true if the user has set the default value for type T&.
+  // Returns true if and only if the user has set the default value for type T&.
   static bool IsSet() { return address_ != nullptr; }
 
   // Returns true if T has a default return value set by the user or there
@@ -375,7 +376,7 @@ class Action {
   template <typename Func>
   explicit Action(const Action<Func>& action) : fun_(action.fun_) {}
 
-  // Returns true if this is the DoDefault() action.
+  // Returns true if and only if this is the DoDefault() action.
   bool IsDoDefault() const { return fun_ == nullptr; }
 
   // Performs the action.  Note that this method is const even though
@@ -395,7 +396,7 @@ class Action {
   template <typename G>
   friend class Action;
 
-  // fun_ is an empty function if this is the DoDefault() action.
+  // fun_ is an empty function if and only if this is the DoDefault() action.
   ::std::function<F> fun_;
 };
 

googlemock/include/gmock/gmock-cardinalities.h

@@ -70,10 +70,12 @@ class CardinalityInterface {
   virtual int ConservativeLowerBound() const { return 0; }
   virtual int ConservativeUpperBound() const { return INT_MAX; }
 
-  // Returns true if call_count calls will satisfy this cardinality.
+  // Returns true if and only if call_count calls will satisfy this
+  // cardinality.
   virtual bool IsSatisfiedByCallCount(int call_count) const = 0;
 
-  // Returns true if call_count calls will saturate this cardinality.
+  // Returns true if and only if call_count calls will saturate this
+  // cardinality.
   virtual bool IsSaturatedByCallCount(int call_count) const = 0;
 
   // Describes self to an ostream.
@@ -98,17 +100,19 @@ class GTEST_API_ Cardinality {
   int ConservativeLowerBound() const { return impl_->ConservativeLowerBound(); }
   int ConservativeUpperBound() const { return impl_->ConservativeUpperBound(); }
 
-  // Returns true if call_count calls will satisfy this cardinality.
+  // Returns true if and only if call_count calls will satisfy this
+  // cardinality.
   bool IsSatisfiedByCallCount(int call_count) const {
     return impl_->IsSatisfiedByCallCount(call_count);
   }
 
-  // Returns true if call_count calls will saturate this cardinality.
+  // Returns true if and only if call_count calls will saturate this
+  // cardinality.
   bool IsSaturatedByCallCount(int call_count) const {
     return impl_->IsSaturatedByCallCount(call_count);
   }
 
-  // Returns true if call_count calls will over-saturate this
+  // Returns true if and only if call_count calls will over-saturate this
   // cardinality, i.e. exceed the maximum number of allowed calls.
   bool IsOverSaturatedByCallCount(int call_count) const {
     return impl_->IsSaturatedByCallCount(call_count) &&

googlemock/include/gmock/gmock-matchers.h

@@ -361,8 +361,8 @@ template <size_t N>
 class TuplePrefix {
  public:
   // TuplePrefix<N>::Matches(matcher_tuple, value_tuple) returns true
-  // if the first N fields of matcher_tuple matches the first N
-  // fields of value_tuple, respectively.
+  // if and only if 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) {
@@ -420,8 +420,8 @@ class TuplePrefix<0> {
                                      ::std::ostream* /* os */) {}
 };
 
-// TupleMatches(matcher_tuple, value_tuple) returns true if all
-// matchers in matcher_tuple match the corresponding fields in
+// TupleMatches(matcher_tuple, value_tuple) returns true if and only if
+// 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.
@@ -2534,7 +2534,8 @@ class KeyMatcherImpl : public MatcherInterface<PairType> {
           testing::SafeMatcherCast<const KeyType&>(inner_matcher)) {
   }
 
-  // Returns true if 'key_value.first' (the key) matches the inner matcher.
+  // Returns true if and only if 'key_value.first' (the key) matches the inner
+  // matcher.
   bool MatchAndExplain(PairType key_value,
                        MatchResultListener* listener) const override {
     StringMatchResultListener inner_listener;
@@ -2616,8 +2617,8 @@ class PairMatcherImpl : public MatcherInterface<PairType> {
     second_matcher_.DescribeNegationTo(os);
   }
 
-  // Returns true if 'a_pair.first' matches first_matcher and 'a_pair.second'
-  // matches second_matcher.
+  // Returns true if and only if 'a_pair.first' matches first_matcher and
+  // 'a_pair.second' matches second_matcher.
   bool MatchAndExplain(PairType a_pair,
                        MatchResultListener* listener) const override {
     if (!listener->IsInterested()) {
@@ -3152,8 +3153,8 @@ class ElementsAreArrayMatcher {
 
 // Given a 2-tuple matcher tm of type Tuple2Matcher and a value second
 // of type Second, BoundSecondMatcher<Tuple2Matcher, Second>(tm,
-// second) is a polymorphic matcher that matches a value x if tm
-// matches tuple (x, second).  Useful for implementing
+// second) is a polymorphic matcher that matches a value x if and only if
+// tm matches tuple (x, second).  Useful for implementing
 // UnorderedPointwise() in terms of UnorderedElementsAreArray().
 //
 // BoundSecondMatcher is copyable and assignable, as we need to put
@@ -3217,8 +3218,8 @@ class BoundSecondMatcher {
 
 // Given a 2-tuple matcher tm and a value second,
 // MatcherBindSecond(tm, second) returns a matcher that matches a
-// value x if tm matches tuple (x, second).  Useful for implementing
-// UnorderedPointwise() in terms of UnorderedElementsAreArray().
+// value x if and only if tm matches tuple (x, second).  Useful for
+// implementing UnorderedPointwise() in terms of UnorderedElementsAreArray().
 template <typename Tuple2Matcher, typename Second>
 BoundSecondMatcher<Tuple2Matcher, Second> MatcherBindSecond(
     const Tuple2Matcher& tm, const Second& second) {
@@ -3710,7 +3711,7 @@ WhenDynamicCastTo(const Matcher<To>& 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 if x.number >= 5.
+// matches a Foo object x if and only if x.number >= 5.
 template <typename Class, typename FieldType, typename FieldMatcher>
 inline PolymorphicMatcher<
   internal::FieldMatcher<Class, FieldType> > Field(
@@ -3737,7 +3738,7 @@ inline PolymorphicMatcher<internal::FieldMatcher<Class, FieldType> > Field(
 // Creates a matcher that matches an object whose given property
 // matches 'matcher'.  For example,
 //   Property(&Foo::str, StartsWith("hi"))
-// matches a Foo object x if x.str() starts with "hi".
+// matches a Foo object x if and only if x.str() starts with "hi".
 template <typename Class, typename PropertyType, typename PropertyMatcher>
 inline PolymorphicMatcher<internal::PropertyMatcher<
     Class, PropertyType, PropertyType (Class::*)() const> >
@@ -3792,11 +3793,10 @@ Property(const std::string& property_name,
           property_name, property, MatcherCast<const PropertyType&>(matcher)));
 }
 
-// Creates a matcher that matches an object if the result of applying
-// a callable to x matches 'matcher'.
-// For example,
+// Creates a matcher that matches an object if and only if the result of
+// applying a callable to x matches 'matcher'. For example,
 //   ResultOf(f, StartsWith("hi"))
-// matches a Foo object x if f(x) starts with "hi".
+// matches a Foo object x if and only if f(x) starts with "hi".
 // `callable` parameter can be a function, function pointer, or a functor. 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
@@ -4345,7 +4345,7 @@ inline internal::MatcherAsPredicate<M> Matches(M matcher) {
   return internal::MatcherAsPredicate<M>(matcher);
 }
 
-// Returns true if the value matches the matcher.
+// Returns true if and only if the value matches the matcher.
 template <typename T, typename M>
 inline bool Value(const T& value, M matcher) {
   return testing::Matches(matcher)(value);
@@ -4551,8 +4551,8 @@ PolymorphicMatcher<internal::variant_matcher::VariantMatcher<T> > VariantWith(
 
 // These macros allow using matchers to check values in Google Test
 // tests.  ASSERT_THAT(value, matcher) and EXPECT_THAT(value, matcher)
-// succeed if the value matches the matcher.  If the assertion fails,
-// the value and the description of the matcher will be printed.
+// succeed if and only if 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(\

googlemock/include/gmock/gmock-spec-builders.h

@@ -332,7 +332,7 @@ class OnCallSpec : public UntypedOnCallSpecBase {
     return *this;
   }
 
-  // Returns true if the given arguments match the matchers.
+  // Returns true if and only if the given arguments match the matchers.
   bool Matches(const ArgumentTuple& args) const {
     return TupleMatches(matchers_, args) && extra_matcher_.Matches(args);
   }
@@ -390,7 +390,7 @@ class GTEST_API_ Mock {
       GTEST_LOCK_EXCLUDED_(internal::g_gmock_mutex);
 
   // Verifies all expectations on the given mock object and clears its
-  // default actions and expectations.  Returns true if the
+  // default actions and expectations.  Returns true if and only if the
   // verification was successful.
   static bool VerifyAndClear(void* mock_obj)
       GTEST_LOCK_EXCLUDED_(internal::g_gmock_mutex);
@@ -516,7 +516,8 @@ class GTEST_API_ Expectation {
   // The compiler-generated copy ctor and operator= work exactly as
   // intended, so we don't need to define our own.
 
-  // Returns true if rhs references the same expectation as this object does.
+  // Returns true if and only if rhs references the same expectation as this
+  // object does.
   bool operator==(const Expectation& rhs) const {
     return expectation_base_ == rhs.expectation_base_;
   }
@@ -598,8 +599,8 @@ class ExpectationSet {
   // The compiler-generator ctor and operator= works exactly as
   // intended, so we don't need to define our own.
 
-  // Returns true if rhs contains the same set of Expectation objects
-  // as this does.
+  // Returns true if and only if rhs contains the same set of Expectation
+  // objects as this does.
   bool operator==(const ExpectationSet& rhs) const {
     return expectations_ == rhs.expectations_;
   }
@@ -760,8 +761,8 @@ class GTEST_API_ ExpectationBase {
   // by the subclasses to implement the .Times() clause.
   void SpecifyCardinality(const Cardinality& cardinality);
 
-  // Returns true if the user specified the cardinality explicitly
-  // using a .Times().
+  // Returns true if and only if the user specified the cardinality
+  // explicitly using a .Times().
   bool cardinality_specified() const { return cardinality_specified_; }
 
   // Sets the cardinality of this expectation spec.
@@ -777,7 +778,7 @@ class GTEST_API_ ExpectationBase {
   void RetireAllPreRequisites()
       GTEST_EXCLUSIVE_LOCK_REQUIRED_(g_gmock_mutex);
 
-  // Returns true if this expectation is retired.
+  // Returns true if and only if this expectation is retired.
   bool is_retired() const
       GTEST_EXCLUSIVE_LOCK_REQUIRED_(g_gmock_mutex) {
     g_gmock_mutex.AssertHeld();
@@ -791,28 +792,29 @@ class GTEST_API_ ExpectationBase {
     retired_ = true;
   }
 
-  // Returns true if this expectation is satisfied.
+  // Returns true if and only if this expectation is satisfied.
   bool IsSatisfied() const
       GTEST_EXCLUSIVE_LOCK_REQUIRED_(g_gmock_mutex) {
     g_gmock_mutex.AssertHeld();
     return cardinality().IsSatisfiedByCallCount(call_count_);
   }
 
-  // Returns true if this expectation is saturated.
+  // Returns true if and only if this expectation is saturated.
   bool IsSaturated() const
       GTEST_EXCLUSIVE_LOCK_REQUIRED_(g_gmock_mutex) {
     g_gmock_mutex.AssertHeld();
     return cardinality().IsSaturatedByCallCount(call_count_);
   }
 
-  // Returns true if this expectation is over-saturated.
+  // Returns true if and only if this expectation is over-saturated.
   bool IsOverSaturated() const
       GTEST_EXCLUSIVE_LOCK_REQUIRED_(g_gmock_mutex) {
     g_gmock_mutex.AssertHeld();
     return cardinality().IsOverSaturatedByCallCount(call_count_);
   }
 
-  // Returns true if all pre-requisites of this expectation are satisfied.
+  // Returns true if and only if all pre-requisites of this expectation are
+  // satisfied.
   bool AllPrerequisitesAreSatisfied() const
       GTEST_EXCLUSIVE_LOCK_REQUIRED_(g_gmock_mutex);
 
@@ -855,7 +857,7 @@ class GTEST_API_ ExpectationBase {
   const char* file_;          // The file that contains the expectation.
   int line_;                  // The line number of the expectation.
   const std::string source_text_;  // The EXPECT_CALL(...) source text.
-  // True if the cardinality is specified explicitly.
+  // True if and only if the cardinality is specified explicitly.
   bool cardinality_specified_;
   Cardinality cardinality_;            // The cardinality of the expectation.
   // The immediate pre-requisites (i.e. expectations that must be
@@ -869,7 +871,7 @@ class GTEST_API_ ExpectationBase {
   // This group of fields are the current state of the expectation,
   // and can change as the mock function is called.
   int call_count_;  // How many times this expectation has been invoked.
-  bool retired_;    // True if this expectation has retired.
+  bool retired_;    // True if and only if this expectation has retired.
   UntypedActions untyped_actions_;
   bool extra_matcher_specified_;
   bool repeated_action_specified_;  // True if a WillRepeatedly() was specified.
@@ -1087,14 +1089,15 @@ class TypedExpectation : public ExpectationBase {
   // statement finishes and when the current thread holds
   // g_gmock_mutex.
 
-  // Returns true if this expectation matches the given arguments.
+  // Returns true if and only if this expectation matches the given arguments.
   bool Matches(const ArgumentTuple& args) const
       GTEST_EXCLUSIVE_LOCK_REQUIRED_(g_gmock_mutex) {
     g_gmock_mutex.AssertHeld();
     return TupleMatches(matchers_, args) && extra_matcher_.Matches(args);
   }
 
-  // Returns true if this expectation should handle the given arguments.
+  // Returns true if and only if this expectation should handle the given
+  // arguments.
   bool ShouldHandleArguments(const ArgumentTuple& args) const
       GTEST_EXCLUSIVE_LOCK_REQUIRED_(g_gmock_mutex) {
     g_gmock_mutex.AssertHeld();

googlemock/include/gmock/internal/gmock-internal-utils.h

@@ -157,11 +157,11 @@ GMOCK_DECLARE_KIND_(long double, kFloatingPoint);
   static_cast< ::testing::internal::TypeKind>( \
       ::testing::internal::KindOf<type>::value)
 
-// Evaluates to true if integer type T is signed.
+// Evaluates to true if and only if integer type T is signed.
 #define GMOCK_IS_SIGNED_(T) (static_cast<T>(-1) < 0)
 
 // LosslessArithmeticConvertibleImpl<kFromKind, From, kToKind, To>::value
-// is true if arithmetic type From can be losslessly converted to
+// is true if and only if arithmetic type From can be losslessly converted to
 // arithmetic type To.
 //
 // It's the user's responsibility to ensure that both From and To are
@@ -192,8 +192,8 @@ template <typename From>
 struct LosslessArithmeticConvertibleImpl<kInteger, From, kBool, bool>
     : public false_type {};  // NOLINT
 
-// Converting an integer to another non-bool integer is lossless if
-// the target type's range encloses the source type's range.
+// Converting an integer to another non-bool integer is lossless
+// if and only if the target type's range encloses the source type's range.
 template <typename From, typename To>
 struct LosslessArithmeticConvertibleImpl<kInteger, From, kInteger, To>
     : public bool_constant<
@@ -224,14 +224,14 @@ struct LosslessArithmeticConvertibleImpl<kFloatingPoint, From, kInteger, To>
     : public false_type {};  // NOLINT
 
 // Converting a floating-point to another floating-point is lossless
-// if the target type is at least as big as the source type.
+// if and only if the target type is at least as big as the source type.
 template <typename From, typename To>
 struct LosslessArithmeticConvertibleImpl<
   kFloatingPoint, From, kFloatingPoint, To>
     : public bool_constant<sizeof(From) <= sizeof(To)> {};  // NOLINT
 
-// LosslessArithmeticConvertible<From, To>::value is true if arithmetic
-// type From can be losslessly converted to arithmetic type To.
+// LosslessArithmeticConvertible<From, To>::value is true if and only if
+// arithmetic type From can be losslessly converted to arithmetic type To.
 //
 // It's the user's responsibility to ensure that both From and To are
 // raw (i.e. has no CV modifier, is not a pointer, and is not a
@@ -305,11 +305,11 @@ const char kWarningVerbosity[] = "warning";
 // No logs are printed.
 const char kErrorVerbosity[] = "error";
 
-// Returns true if a log with the given severity is visible according
-// to the --gmock_verbose flag.
+// Returns true if and only if a log with the given severity is visible
+// according to the --gmock_verbose flag.
 GTEST_API_ bool LogIsVisible(LogSeverity severity);
 
-// Prints the given message to stdout if 'severity' >= the level
+// Prints the given message to stdout if and only if 'severity' >= the level
 // specified by the --gmock_verbose flag.  If stack_frames_to_skip >=
 // 0, also prints the stack trace excluding the top
 // stack_frames_to_skip frames.  In opt mode, any positive

googlemock/src/gmock-internal-utils.cc

@@ -123,8 +123,8 @@ GTEST_API_ FailureReporterInterface* GetFailureReporter() {
 // Protects global resources (stdout in particular) used by Log().
 static GTEST_DEFINE_STATIC_MUTEX_(g_log_mutex);
 
-// Returns true if a log with the given severity is visible according
-// to the --gmock_verbose flag.
+// Returns true if and only if a log with the given severity is visible
+// according to the --gmock_verbose flag.
 GTEST_API_ bool LogIsVisible(LogSeverity severity) {
   if (GMOCK_FLAG(verbose) == kInfoVerbosity) {
     // Always show the log if --gmock_verbose=info.
@@ -139,7 +139,7 @@ GTEST_API_ bool LogIsVisible(LogSeverity severity) {
   }
 }
 
-// Prints the given message to stdout if 'severity' >= the level
+// Prints the given message to stdout if and only if 'severity' >= the level
 // specified by the --gmock_verbose flag.  If stack_frames_to_skip >=
 // 0, also prints the stack trace excluding the top
 // stack_frames_to_skip frames.  In opt mode, any positive

googlemock/src/gmock-spec-builders.cc

@@ -126,8 +126,8 @@ void ExpectationBase::RetireAllPreRequisites()
   }
 }
 
-// Returns true if all pre-requisites of this expectation have been
-// satisfied.
+// Returns true if and only if all pre-requisites of this expectation
+// have been satisfied.
 bool ExpectationBase::AllPrerequisitesAreSatisfied() const
     GTEST_EXCLUSIVE_LOCK_REQUIRED_(g_gmock_mutex) {
   g_gmock_mutex.AssertHeld();
@@ -384,7 +384,7 @@ UntypedActionResultHolderBase* UntypedFunctionMockerBase::UntypedInvokeWith(
     const CallReaction reaction =
         Mock::GetReactionOnUninterestingCalls(MockObject());
 
-    // True if we need to print this call's arguments and return
+    // True if and only if we need to print this call's arguments and return
     // value.  This definition must be kept in sync with
     // the behavior of ReportUninterestingCall().
     const bool need_to_report_uninteresting_call =
@@ -435,7 +435,8 @@ UntypedActionResultHolderBase* UntypedFunctionMockerBase::UntypedInvokeWith(
           &ss, &why);
   const bool found = untyped_expectation != nullptr;
 
-  // True if we need to print the call's arguments and return value.
+  // True if and only if we need to print the call's arguments
+  // and return value.
   // This definition must be kept in sync with the uses of Expect()
   // and Log() in this function.
   const bool need_to_report_call =
@@ -574,7 +575,7 @@ struct MockObjectState {
   int first_used_line;
   ::std::string first_used_test_suite;
   ::std::string first_used_test;
-  bool leakable;  // true if it's OK to leak the object.
+  bool leakable;  // true if and only if it's OK to leak the object.
   FunctionMockers function_mockers;  // All registered methods of the object.
 };
 
@@ -718,7 +719,7 @@ bool Mock::VerifyAndClearExpectations(void* mock_obj)
 }
 
 // Verifies all expectations on the given mock object and clears its
-// default actions and expectations.  Returns true if the
+// default actions and expectations.  Returns true if and only if the
 // verification was successful.
 bool Mock::VerifyAndClear(void* mock_obj)
     GTEST_LOCK_EXCLUDED_(internal::g_gmock_mutex) {

googlemock/src/gmock.cc

@@ -34,8 +34,8 @@
 namespace testing {
 
 GMOCK_DEFINE_bool_(catch_leaked_mocks, true,
-                   "true if Google Mock should report leaked mock objects "
-                   "as failures.");
+                   "true if and only if Google Mock should report leaked "
+                   "mock objects as failures.");
 
 GMOCK_DEFINE_string_(verbose, internal::kWarningVerbosity,
                      "Controls how verbose Google Mock's output is."

googlemock/test/gmock-cardinalities_test.cc

@@ -395,12 +395,14 @@ TEST(ExactlyTest, HasCorrectBounds) {
 
 class EvenCardinality : public CardinalityInterface {
  public:
-  // Returns true if call_count calls will satisfy this cardinality.
+  // Returns true if and only if call_count calls will satisfy this
+  // cardinality.
   bool IsSatisfiedByCallCount(int call_count) const override {
     return (call_count % 2 == 0);
   }
 
-  // Returns true if call_count calls will saturate this cardinality.
+  // Returns true if and only if call_count calls will saturate this
+  // cardinality.
   bool IsSaturatedByCallCount(int /* call_count */) const override {
     return false;
   }

googlemock/test/gmock-matchers_test.cc

@@ -956,10 +956,9 @@ TEST(TypedEqTest, CanDescribeSelf) {
 
 // Tests that TypedEq<T>(v) has type Matcher<T>.
 
-// Type<T>::IsTypeOf(v) compiles if the type of value v is T, where T
-// is a "bare" type (i.e. not in the form of const U or U&).  If v's
-// type is not T, the compiler will generate a message about
-// "undefined reference".
+// Type<T>::IsTypeOf(v) compiles if and only if the type of value v is T, where
+// T is a "bare" type (i.e. not in the form of const U or U&).  If v's type is
+// not T, the compiler will generate a message about "undefined reference".
 template <typename T>
 struct Type {
   static bool IsTypeOf(const T& /* v */) { return true; }
@@ -2640,8 +2639,8 @@ class IsGreaterThan {
 // For testing Truly().
 const int foo = 0;
 
-// This predicate returns true if the argument references foo and has
-// a zero value.
+// This predicate returns true if and only if the argument references foo and
+// has a zero value.
 bool ReferencesFooAndIsZero(const int& n) {
   return (&n == &foo) && (n == 0);
 }
@@ -3594,7 +3593,7 @@ class Uncopyable {
   GTEST_DISALLOW_COPY_AND_ASSIGN_(Uncopyable);
 };
 
-// Returns true if x.value() is positive.
+// Returns true if and only if x.value() is positive.
 bool ValueIsPositive(const Uncopyable& x) { return x.value() > 0; }
 
 MATCHER_P(UncopyableIs, inner_matcher, "") {

googlemock/test/gmock-spec-builders_test.cc

@@ -1952,12 +1952,14 @@ TEST(DeletingMockEarlyTest, Failure2) {
 
 class EvenNumberCardinality : public CardinalityInterface {
  public:
-  // Returns true if call_count calls will satisfy this cardinality.
+  // Returns true if and only if call_count calls will satisfy this
+  // cardinality.
   bool IsSatisfiedByCallCount(int call_count) const override {
     return call_count % 2 == 0;
   }
 
-  // Returns true if call_count calls will saturate this cardinality.
+  // Returns true if and only if call_count calls will saturate this
+  // cardinality.
   bool IsSaturatedByCallCount(int /* call_count */) const override {
     return false;
   }

googletest/include/gtest/gtest-death-test.h

@@ -276,20 +276,20 @@ class GTEST_API_ KilledBySignal {
 // This macro is used for implementing macros such as
 // EXPECT_DEATH_IF_SUPPORTED and ASSERT_DEATH_IF_SUPPORTED on systems where
 // death tests are not supported. Those macros must compile on such systems
-// if EXPECT_DEATH and ASSERT_DEATH compile with the same parameters on
-// systems that support death tests. This allows one to write such a macro
-// on a system that does not support death tests and be sure that it will
-// compile on a death-test supporting system. It is exposed publicly so that
-// systems that have death-tests with stricter requirements than
-// GTEST_HAS_DEATH_TEST can write their own equivalent of
-// EXPECT_DEATH_IF_SUPPORTED and ASSERT_DEATH_IF_SUPPORTED.
+// if and only if EXPECT_DEATH and ASSERT_DEATH compile with the same parameters
+// on systems that support death tests. This allows one to write such a macro on
+// a system that does not support death tests and be sure that it will compile
+// on a death-test supporting system. It is exposed publicly so that systems
+// that have death-tests with stricter requirements than GTEST_HAS_DEATH_TEST
+// can write their own equivalent of EXPECT_DEATH_IF_SUPPORTED and
+// ASSERT_DEATH_IF_SUPPORTED.
 //
 // Parameters:
 //   statement -  A statement that a macro such as EXPECT_DEATH would test
 //                for program termination. This macro has to make sure this
 //                statement is compiled but not executed, to ensure that
 //                EXPECT_DEATH_IF_SUPPORTED compiles with a certain
-//                parameter if EXPECT_DEATH compiles with it.
+//                parameter if and only if EXPECT_DEATH compiles with it.
 //   regex     -  A regex that a macro such as EXPECT_DEATH would use to test
 //                the output of statement.  This parameter has to be
 //                compiled but not evaluated by this macro, to ensure that

googletest/include/gtest/gtest-matchers.h

@@ -96,8 +96,8 @@ class MatchResultListener {
   // Returns the underlying ostream.
   ::std::ostream* stream() { return stream_; }
 
-  // Returns true if the listener is interested in an explanation of
-  // the match result.  A matcher's MatchAndExplain() method can use
+  // Returns true if and only if 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_ != nullptr; }
@@ -141,8 +141,8 @@ class MatcherDescriberInterface {
 template <typename T>
 class MatcherInterface : public MatcherDescriberInterface {
  public:
-  // Returns true if the matcher matches x; also explains the match
-  // result to 'listener' if necessary (see the next paragraph), in
+  // Returns true if and only if the matcher matches x; also explains the
+  // match 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
@@ -258,13 +258,13 @@ class StreamMatchResultListener : public MatchResultListener {
 template <typename T>
 class MatcherBase {
  public:
-  // Returns true if the matcher matches x; also explains the match
-  // result to 'listener'.
+  // Returns true if and only if the matcher matches x; also explains the
+  // match result to 'listener'.
   bool MatchAndExplain(const T& x, MatchResultListener* listener) const {
     return impl_->MatchAndExplain(x, listener);
   }
 
-  // Returns true if this matcher matches x.
+  // Returns true if and only if this matcher matches x.
   bool Matches(const T& x) const {
     DummyMatchResultListener dummy;
     return MatchAndExplain(x, &dummy);

googletest/include/gtest/gtest-test-part.h

@@ -87,19 +87,19 @@ class GTEST_API_ TestPartResult {
   // Gets the message associated with the test part.
   const char* message() const { return message_.c_str(); }
 
-  // Returns true if the test part was skipped.
+  // Returns true if and only if the test part was skipped.
   bool skipped() const { return type_ == kSkip; }
 
-  // Returns true if the test part passed.
+  // Returns true if and only if the test part passed.
   bool passed() const { return type_ == kSuccess; }
 
-  // Returns true if the test part non-fatally failed.
+  // Returns true if and only if the test part non-fatally failed.
   bool nonfatally_failed() const { return type_ == kNonFatalFailure; }
 
-  // Returns true if the test part fatally failed.
+  // Returns true if and only if the test part fatally failed.
   bool fatally_failed() const { return type_ == kFatalFailure; }
 
-  // Returns true if the test part failed.
+  // Returns true if and only if the test part failed.
   bool failed() const { return fatally_failed() || nonfatally_failed(); }
 
  private:

googletest/include/gtest/gtest.h

@@ -308,7 +308,7 @@ class GTEST_API_ AssertionResult {
     return *this;
   }
 
-  // Returns true if the assertion succeeded.
+  // Returns true if and only if the assertion succeeded.
   operator bool() const { return success_; }  // NOLINT
 
   // Returns the assertion's negation. Used with EXPECT/ASSERT_FALSE.
@@ -432,16 +432,16 @@ class GTEST_API_ Test {
   static void SetUpTestCase() {}
 #endif  // GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 
-  // Returns true if the current test has a fatal failure.
+  // Returns true if and only if the current test has a fatal failure.
   static bool HasFatalFailure();
 
-  // Returns true if the current test has a non-fatal failure.
+  // Returns true if and only if the current test has a non-fatal failure.
   static bool HasNonfatalFailure();
 
-  // Returns true if the current test was skipped.
+  // Returns true if and only if the current test was skipped.
   static bool IsSkipped();
 
-  // Returns true if the current test has a (either fatal or
+  // Returns true if and only if the current test has a (either fatal or
   // non-fatal) failure.
   static bool HasFailure() { return HasFatalFailure() || HasNonfatalFailure(); }
 
@@ -472,8 +472,8 @@ class GTEST_API_ Test {
   virtual void TearDown();
 
  private:
-  // Returns true if the current test has the same fixture class as
-  // the first test in the current test suite.
+  // Returns true if and only if the current test has the same fixture class
+  // as the first test in the current test suite.
   static bool HasSameFixtureClass();
 
   // Runs the test after the test fixture has been set up.
@@ -574,19 +574,19 @@ class GTEST_API_ TestResult {
   // Returns the number of the test properties.
   int test_property_count() const;
 
-  // Returns true if the test passed (i.e. no test part failed).
+  // Returns true if and only if the test passed (i.e. no test part failed).
   bool Passed() const { return !Skipped() && !Failed(); }
 
-  // Returns true if the test was skipped.
+  // Returns true if and only if the test was skipped.
   bool Skipped() const;
 
-  // Returns true if the test failed.
+  // Returns true if and only if the test failed.
   bool Failed() const;
 
-  // Returns true if the test fatally failed.
+  // Returns true if and only if the test fatally failed.
   bool HasFatalFailure() const;
 
-  // Returns true if the test has a non-fatal failure.
+  // Returns true if and only if the test has a non-fatal failure.
   bool HasNonfatalFailure() const;
 
   // Returns the elapsed time, in milliseconds.
@@ -750,7 +750,7 @@ class GTEST_API_ TestInfo {
   // contains the character 'A' or starts with "Foo.".
   bool should_run() const { return should_run_; }
 
-  // Returns true if this test will appear in the XML report.
+  // Returns true if and only if this test will appear in the XML report.
   bool is_reportable() const {
     // The XML report includes tests matching the filter, excluding those
     // run in other shards.
@@ -808,12 +808,12 @@ class GTEST_API_ TestInfo {
   // value-parameterized test.
   const std::unique_ptr<const ::std::string> value_param_;
   internal::CodeLocation location_;
-  const internal::TypeId fixture_class_id_;   // ID of the test fixture class
-  bool should_run_;                 // True if this test should run
-  bool is_disabled_;                // True if this test is disabled
-  bool matches_filter_;             // True if this test matches the
-                                    // user-specified filter.
-  bool is_in_another_shard_;        // Will be run in another shard.
+  const internal::TypeId fixture_class_id_;  // ID of the test fixture class
+  bool should_run_;           // True if and only if this test should run
+  bool is_disabled_;          // True if and only if this test is disabled
+  bool matches_filter_;       // True if this test matches the
+                              // user-specified filter.
+  bool is_in_another_shard_;  // Will be run in another shard.
   internal::TestFactoryBase* const factory_;  // The factory that creates
                                               // the test object
 
@@ -885,10 +885,10 @@ class GTEST_API_ TestSuite {
   // Gets the number of all tests in this test suite.
   int total_test_count() const;
 
-  // Returns true if the test suite passed.
+  // Returns true if and only if the test suite passed.
   bool Passed() const { return !Failed(); }
 
-  // Returns true if the test suite failed.
+  // Returns true if and only if the test suite failed.
   bool Failed() const { return failed_test_count() > 0; }
 
   // Returns the elapsed time, in milliseconds.
@@ -956,33 +956,33 @@ class GTEST_API_ TestSuite {
     }
   }
 
-  // Returns true if test passed.
+  // Returns true if and only if test passed.
   static bool TestPassed(const TestInfo* test_info) {
     return test_info->should_run() && test_info->result()->Passed();
   }
 
-  // Returns true if test skipped.
+  // Returns true if and only if test skipped.
   static bool TestSkipped(const TestInfo* test_info) {
     return test_info->should_run() && test_info->result()->Skipped();
   }
 
-  // Returns true if test failed.
+  // Returns true if and only if test failed.
   static bool TestFailed(const TestInfo* test_info) {
     return test_info->should_run() && test_info->result()->Failed();
   }
 
-  // Returns true if the test is disabled and will be reported in the XML
-  // report.
+  // Returns true if and only if the test is disabled and will be reported in
+  // the XML report.
   static bool TestReportableDisabled(const TestInfo* test_info) {
     return test_info->is_reportable() && test_info->is_disabled_;
   }
 
-  // Returns true if test is disabled.
+  // Returns true if and only if test is disabled.
   static bool TestDisabled(const TestInfo* test_info) {
     return test_info->is_disabled_;
   }
 
-  // Returns true if this test will appear in the XML report.
+  // Returns true if and only if this test will appear in the XML report.
   static bool TestReportable(const TestInfo* test_info) {
     return test_info->is_reportable();
   }
@@ -1014,7 +1014,7 @@ class GTEST_API_ TestSuite {
   internal::SetUpTestSuiteFunc set_up_tc_;
   // Pointer to the function that tears down the test suite.
   internal::TearDownTestSuiteFunc tear_down_tc_;
-  // True if any test in this test suite should run.
+  // True if and only if any test in this test suite should run.
   bool should_run_;
   // The start time, in milliseconds since UNIX Epoch.
   TimeInMillis start_timestamp_;
@@ -1349,11 +1349,12 @@ class GTEST_API_ UnitTest {
   // Gets the elapsed time, in milliseconds.
   TimeInMillis elapsed_time() const;
 
-  // Returns true if the unit test passed (i.e. all test suites passed).
+  // Returns true if and only if the unit test passed (i.e. all test suites
+  // passed).
   bool Passed() const;
 
-  // Returns true if the unit test failed (i.e. some test suite failed
-  // or something outside of all tests failed).
+  // Returns true if and only if the unit test failed (i.e. some test suite
+  // failed or something outside of all tests failed).
   bool Failed() const;
 
   // Gets the i-th test suite among all the test suites. i can range from 0 to
@@ -2267,8 +2268,8 @@ class GTEST_API_ ScopedTrace {
 
 
 // Compile-time assertion for type equality.
-// StaticAssertTypeEq<type1, type2>() compiles if type1 and type2 are
-// the same type.  The value it returns is not interesting.
+// StaticAssertTypeEq<type1, type2>() compiles if and only if type1 and type2
+// are the same type.  The value it returns is not interesting.
 //
 // Instead of making StaticAssertTypeEq a class template, we make it a
 // function template that invokes a helper class template.  This

googletest/include/gtest/internal/gtest-filepath.h

@@ -110,7 +110,7 @@ class GTEST_API_ FilePath {
                                          const FilePath& base_name,
                                          const char* extension);
 
-  // Returns true if the path is "".
+  // Returns true if and only if the path is "".
   bool IsEmpty() const { return pathname_.empty(); }
 
   // If input name has a trailing separator character, removes it and returns

googletest/include/gtest/internal/gtest-internal.h

@@ -189,7 +189,7 @@ GTEST_API_ std::string DiffStrings(const std::string& left,
 //   expected_value:      "5"
 //   actual_value:        "6"
 //
-// The ignoring_case parameter is true if the assertion is a
+// The ignoring_case parameter is true if and only if the assertion is a
 // *_STRCASEEQ*.  When it's true, the string " (ignoring case)" will
 // be inserted into the message.
 GTEST_API_ AssertionResult EqFailure(const char* expected_expression,
@@ -318,15 +318,15 @@ class FloatingPoint {
   // Returns the sign bit of this number.
   Bits sign_bit() const { return kSignBitMask & u_.bits_; }
 
-  // Returns true if this is NAN (not a number).
+  // Returns true if and only if this is NAN (not a number).
   bool is_nan() const {
     // It's a NAN if the exponent bits are all ones and the fraction
     // bits are not entirely zeros.
     return (exponent_bits() == kExponentBitMask) && (fraction_bits() != 0);
   }
 
-  // Returns true if this number is at most kMaxUlps ULP's away from
-  // rhs.  In particular, this function:
+  // Returns true if and only if this number is at most kMaxUlps ULP's away
+  // from rhs.  In particular, this function:
   //
   //   - returns false if either number is (or both are) NAN.
   //   - treats really large numbers as almost equal to infinity.
@@ -848,7 +848,7 @@ class GTEST_API_ Random {
 };
 
 // Defining a variable of type CompileAssertTypesEqual<T1, T2> will cause a
-// compiler error if T1 and T2 are different types.
+// compiler error if and only if T1 and T2 are different types.
 template <typename T1, typename T2>
 struct CompileAssertTypesEqual;
 
@@ -895,7 +895,7 @@ struct RemoveConst<const T[N]> {
     GTEST_REMOVE_CONST_(GTEST_REMOVE_REFERENCE_(T))
 
 // IsAProtocolMessage<T>::value is a compile-time bool constant that's
-// true if T is type proto2::Message or a subclass of it.
+// true if and only if T is type proto2::Message or a subclass of it.
 template <typename T>
 struct IsAProtocolMessage
     : public bool_constant<

googletest/include/gtest/internal/gtest-port.h

@@ -362,7 +362,8 @@ typedef struct _RTL_CRITICAL_SECTION GTEST_CRITICAL_SECTION;
 #  include <android/api-level.h>  // NOLINT
 #endif
 
-// Defines this to true if Google Test can use POSIX regular expressions.
+// Defines this to true if and only if Google Test can use POSIX regular
+// expressions.
 #ifndef GTEST_HAS_POSIX_RE
 # if GTEST_OS_LINUX_ANDROID
 // On Android, <regex.h> is only available starting with Gingerbread.
@@ -403,7 +404,7 @@ typedef struct _RTL_CRITICAL_SECTION GTEST_CRITICAL_SECTION;
 // The user didn't tell us whether exceptions are enabled, so we need
 // to figure it out.
 # if defined(_MSC_VER) && defined(_CPPUNWIND)
-// MSVC defines _CPPUNWIND to 1 if exceptions are enabled.
+// MSVC defines _CPPUNWIND to 1 if and only if exceptions are enabled.
 #  define GTEST_HAS_EXCEPTIONS 1
 # elif defined(__BORLANDC__)
 // C++Builder's implementation of the STL uses the _HAS_EXCEPTIONS
@@ -414,16 +415,17 @@ typedef struct _RTL_CRITICAL_SECTION GTEST_CRITICAL_SECTION;
 #  endif  // _HAS_EXCEPTIONS
 #  define GTEST_HAS_EXCEPTIONS _HAS_EXCEPTIONS
 # elif defined(__clang__)
-// clang defines __EXCEPTIONS if exceptions are enabled before clang 220714,
-// but if cleanups are enabled after that. In Obj-C++ files, there can be
-// cleanups for ObjC exceptions which also need cleanups, even if C++ exceptions
-// are disabled. clang has __has_feature(cxx_exceptions) which checks for C++
-// exceptions starting at clang r206352, but which checked for cleanups prior to
-// that. To reliably check for C++ exception availability with clang, check for
+// clang defines __EXCEPTIONS if and only if exceptions are enabled before clang
+// 220714, but if and only if cleanups are enabled after that. In Obj-C++ files,
+// there can be cleanups for ObjC exceptions which also need cleanups, even if
+// C++ exceptions are disabled. clang has __has_feature(cxx_exceptions) which
+// checks for C++ exceptions starting at clang r206352, but which checked for
+// cleanups prior to that. To reliably check for C++ exception availability with
+// clang, check for
 // __EXCEPTIONS && __has_feature(cxx_exceptions).
 #  define GTEST_HAS_EXCEPTIONS (__EXCEPTIONS && __has_feature(cxx_exceptions))
 # elif defined(__GNUC__) && __EXCEPTIONS
-// gcc defines __EXCEPTIONS to 1 if exceptions are enabled.
+// gcc defines __EXCEPTIONS to 1 if and only if exceptions are enabled.
 #  define GTEST_HAS_EXCEPTIONS 1
 # elif defined(__SUNPRO_CC)
 // Sun Pro CC supports exceptions.  However, there is no compile-time way of
@@ -431,7 +433,7 @@ typedef struct _RTL_CRITICAL_SECTION GTEST_CRITICAL_SECTION;
 // they are enabled unless the user tells us otherwise.
 #  define GTEST_HAS_EXCEPTIONS 1
 # elif defined(__IBMCPP__) && __EXCEPTIONS
-// xlC defines __EXCEPTIONS to 1 if exceptions are enabled.
+// xlC defines __EXCEPTIONS to 1 if and only if exceptions are enabled.
 #  define GTEST_HAS_EXCEPTIONS 1
 # elif defined(__HP_aCC)
 // Exception handling is in effect by default in HP aCC compiler. It has to
@@ -472,13 +474,14 @@ typedef struct _RTL_CRITICAL_SECTION GTEST_CRITICAL_SECTION;
 
 # ifdef _MSC_VER
 
-#  ifdef _CPPRTTI  // MSVC defines this macro if RTTI is enabled.
+#  ifdef _CPPRTTI  // MSVC defines this macro if and only if RTTI is enabled.
 #   define GTEST_HAS_RTTI 1
 #  else
 #   define GTEST_HAS_RTTI 0
 #  endif
 
-// Starting with version 4.3.2, gcc defines __GXX_RTTI if RTTI is enabled.
+// Starting with version 4.3.2, gcc defines __GXX_RTTI if and only if RTTI is
+// enabled.
 # elif defined(__GNUC__)
 
 #  ifdef __GXX_RTTI
@@ -899,9 +902,9 @@ class GTEST_API_ RE {
   // Returns the string representation of the regex.
   const char* pattern() const { return pattern_; }
 
-  // FullMatch(str, re) returns true if regular expression re matches
-  // the entire str.
-  // PartialMatch(str, re) returns true if regular expression re
+  // FullMatch(str, re) returns true if and only if regular expression re
+  // matches the entire str.
+  // PartialMatch(str, re) returns true if and only if regular expression re
   // matches a substring of str (including str itself).
   static bool FullMatch(const ::std::string& str, const RE& re) {
     return FullMatch(str.c_str(), re);
@@ -1256,7 +1259,8 @@ class GTEST_API_ AutoHandle {
   void Reset(Handle handle);
 
  private:
-  // Returns true if the handle is a valid handle object that can be closed.
+  // Returns true if and only if the handle is a valid handle object that can be
+  // closed.
   bool IsCloseable() const;
 
   Handle handle_;
@@ -1358,7 +1362,8 @@ class ThreadWithParam : public ThreadWithParamBase {
   // When non-NULL, used to block execution until the controller thread
   // notifies.
   Notification* const thread_can_start_;
-  bool finished_;  // true if we know that the thread function has finished.
+  bool finished_;  // true if and only if we know that the thread function has
+                   // finished.
   pthread_t thread_;  // The native thread object.
 
   GTEST_DISALLOW_COPY_AND_ASSIGN_(ThreadWithParam);