Adds the ReturnArg<k>() action (by Tim Hockin); refactors gmock-matchers.h (by Zhanyong Wan).

include/gmock/gmock-generated-actions.h

@@ -2441,6 +2441,13 @@ ACTION_TEMPLATE(InvokeArgument,
       ::std::tr1::get<k>(args), p0, p1, p2, p3, p4, p5, p6, p7, p8, p9);
 }
 
+// Action ReturnArg<k>() returns the k-th argument of the mock function.
+ACTION_TEMPLATE(ReturnArg,
+                HAS_1_TEMPLATE_PARAMS(int, k),
+                AND_0_VALUE_PARAMS()) {
+  return std::tr1::get<k>(args);
+}
+
 // Action SaveArg<k>(pointer) saves the k-th (0-based) argument of the
 // mock function to *pointer.
 ACTION_TEMPLATE(SaveArg,

include/gmock/gmock-generated-actions.h.pump

 $$ -*- mode: c++; -*-
 $$ This is a Pump source file.  Please use Pump to convert it to
-$$ gmock-generated-variadic-actions.h.
+$$ gmock-generated-actions.h.
 $$
 $var n = 10  $$ The maximum arity we support.
 $$}} This meta comment fixes auto-indentation in editors.
@@ -940,6 +940,13 @@ ACTION_TEMPLATE(InvokeArgument,
 
 ]]
 
+// Action ReturnArg<k>() returns the k-th argument of the mock function.
+ACTION_TEMPLATE(ReturnArg,
+                HAS_1_TEMPLATE_PARAMS(int, k),
+                AND_0_VALUE_PARAMS()) {
+  return std::tr1::get<k>(args);
+}
+
 // Action SaveArg<k>(pointer) saves the k-th (0-based) argument of the
 // mock function to *pointer.
 ACTION_TEMPLATE(SaveArg,

include/gmock/gmock-generated-matchers.h

@@ -290,163 +290,7 @@ class ArgsMatcher {
   const InnerMatcher inner_matcher_;
 };
 
-// Implements ElementsAre() and ElementsAreArray().
-template <typename Container>
-class ElementsAreMatcherImpl : public MatcherInterface<Container> {
- public:
-  typedef GMOCK_REMOVE_CONST_(GMOCK_REMOVE_REFERENCE_(Container)) RawContainer;
-  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>
-  ElementsAreMatcherImpl(InputIter first, size_t count) {
-    matchers_.reserve(count);
-    InputIter it = first;
-    for (size_t i = 0; i != count; ++i, ++it) {
-      matchers_.push_back(MatcherCast<const Element&>(*it));
-    }
-  }
-
-  // Returns true iff 'container' matches.
-  virtual bool Matches(Container container) const {
-    StlContainerReference stl_container = View::ConstReference(container);
-    if (stl_container.size() != count())
-      return false;
-
-    typename StlContainer::const_iterator it = stl_container.begin();
-    for (size_t i = 0; i != count();  ++it, ++i) {
-      if (!matchers_[i].Matches(*it))
-        return false;
-    }
-
-    return true;
-  }
-
-  // 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) {
-        *os << "element " << i << " ";
-        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) {
-      *os << "is not empty";
-      return;
-    }
-
-    *os << "does not have " << Elements(count()) << ", or\n";
-    for (size_t i = 0; i != count(); ++i) {
-      *os << "element " << i << " ";
-      matchers_[i].DescribeNegationTo(os);
-      if (i + 1 < count()) {
-        *os << ", or\n";
-      }
-    }
-  }
-
-  // Explains why 'container' matches, or doesn't match, this matcher.
-  virtual void ExplainMatchResultTo(Container container,
-                                    ::std::ostream* os) const {
-    StlContainerReference stl_container = View::ConstReference(container);
-    if (Matches(container)) {
-      // We need to explain why *each* element matches (the obvious
-      // ones can be skipped).
-
-      bool reason_printed = false;
-      typename StlContainer::const_iterator it = stl_container.begin();
-      for (size_t i = 0; i != count(); ++it, ++i) {
-        ::std::stringstream ss;
-        matchers_[i].ExplainMatchResultTo(*it, &ss);
-
-        const string s = ss.str();
-        if (!s.empty()) {
-          if (reason_printed) {
-            *os << ",\n";
-          }
-          *os << "element " << i << " " << s;
-          reason_printed = true;
-        }
-      }
-    } else {
-      // We need to explain why the container doesn't match.
-      const size_t actual_count = stl_container.size();
-      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.
-        if (actual_count != 0) {
-          *os << "has " << Elements(actual_count);
-        }
-        return;
-      }
-
-      // The container has the right size but at least one element
-      // doesn't match expectation.  We need to find this element and
-      // explain why it doesn't match.
-      typename StlContainer::const_iterator it = stl_container.begin();
-      for (size_t i = 0; i != count(); ++it, ++i) {
-        if (matchers_[i].Matches(*it)) {
-          continue;
-        }
-
-        *os << "element " << i << " doesn't match";
-
-        ::std::stringstream ss;
-        matchers_[i].ExplainMatchResultTo(*it, &ss);
-        const string s = ss.str();
-        if (!s.empty()) {
-          *os << " (" << s << ")";
-        }
-        return;
-      }
-    }
-  }
-
- private:
-  static Message Elements(size_t count) {
-    return Message() << count << (count == 1 ? " element" : " elements");
-  }
-
-  size_t count() const { return matchers_.size(); }
-  std::vector<Matcher<const Element&> > matchers_;
-};
-
-// Implements ElementsAre() of 0-10 arguments.
-
-class ElementsAreMatcher0 {
- public:
-  ElementsAreMatcher0() {}
-
-  template <typename Container>
-  operator Matcher<Container>() const {
-    typedef GMOCK_REMOVE_CONST_(GMOCK_REMOVE_REFERENCE_(Container))
-        RawContainer;
-    typedef typename internal::StlContainerView<RawContainer>::type::value_type
-        Element;
-
-    const Matcher<const Element&>* const matchers = NULL;
-    return MakeMatcher(new ElementsAreMatcherImpl<Container>(matchers, 0));
-  }
-};
+// Implements ElementsAre() of 1-10 arguments.
 
 template <typename T1>
 class ElementsAreMatcher1 {
@@ -788,28 +632,6 @@ class ElementsAreMatcher10 {
   const T10& e10_;
 };
 
-// Implements ElementsAreArray().
-template <typename T>
-class ElementsAreArrayMatcher {
- public:
-  ElementsAreArrayMatcher(const T* first, size_t count) :
-      first_(first), count_(count) {}
-
-  template <typename Container>
-  operator Matcher<Container>() const {
-    typedef GMOCK_REMOVE_CONST_(GMOCK_REMOVE_REFERENCE_(Container))
-        RawContainer;
-    typedef typename internal::StlContainerView<RawContainer>::type::value_type
-        Element;
-
-    return MakeMatcher(new ElementsAreMatcherImpl<Container>(first_, count_));
-  }
-
- private:
-  const T* const first_;
-  const size_t count_;
-};
-
 }  // namespace internal
 
 // Args<N1, N2, ..., Nk>(a_matcher) matches a tuple if the selected
@@ -1169,48 +991,6 @@ ElementsAreArray(const T (&array)[N]) {
 // To learn more about using these macros, please search for 'MATCHER'
 // on http://code.google.com/p/googlemock/wiki/CookBook.
 
-namespace testing {
-namespace internal {
-
-// Constants denoting interpolations in a matcher description string.
-const int kTupleInterpolation = -1;    // "%(*)s"
-const int kPercentInterpolation = -2;  // "%%"
-const int kInvalidInterpolation = -3;  // "%" followed by invalid text
-
-// Records the location and content of an interpolation.
-struct Interpolation {
-  Interpolation(const char* start, const char* end, int param)
-      : start_pos(start), end_pos(end), param_index(param) {}
-
-  // Points to the start of the interpolation (the '%' character).
-  const char* start_pos;
-  // Points to the first character after the interpolation.
-  const char* end_pos;
-  // 0-based index of the interpolated matcher parameter;
-  // kTupleInterpolation for "%(*)s"; kPercentInterpolation for "%%".
-  int param_index;
-};
-
-typedef ::std::vector<Interpolation> Interpolations;
-
-// Parses a matcher description string and returns a vector of
-// interpolations that appear in the string; generates non-fatal
-// failures iff 'description' is an invalid matcher description.
-// 'param_names' is a NULL-terminated array of parameter names in the
-// order they appear in the MATCHER_P*() parameter list.
-Interpolations ValidateMatcherDescription(
-    const char* param_names[], const char* description);
-
-// Returns the actual matcher description, given the matcher name,
-// user-supplied description template string, interpolations in the
-// string, and the printed values of the matcher parameters.
-string FormatMatcherDescription(
-    const char* matcher_name, const char* description,
-    const Interpolations& interp, const Strings& param_values);
-
-}  // namespace internal
-}  // namespace testing
-
 #define MATCHER(name, description)\
   class name##Matcher {\
    public:\

include/gmock/gmock-generated-matchers.h.pump

 $$ -*- mode: c++; -*-
 $$ This is a Pump source file.  Please use Pump to convert it to
-$$ gmock-generated-variadic-actions.h.
+$$ gmock-generated-actions.h.
 $$
 $var n = 10  $$ The maximum arity we support.
 $$ }} This line fixes auto-indentation of the following code in Emacs.
@@ -173,163 +173,7 @@ class ArgsMatcher {
   const InnerMatcher inner_matcher_;
 };
 
-// Implements ElementsAre() and ElementsAreArray().
-template <typename Container>
-class ElementsAreMatcherImpl : public MatcherInterface<Container> {
- public:
-  typedef GMOCK_REMOVE_CONST_(GMOCK_REMOVE_REFERENCE_(Container)) RawContainer;
-  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>
-  ElementsAreMatcherImpl(InputIter first, size_t count) {
-    matchers_.reserve(count);
-    InputIter it = first;
-    for (size_t i = 0; i != count; ++i, ++it) {
-      matchers_.push_back(MatcherCast<const Element&>(*it));
-    }
-  }
-
-  // Returns true iff 'container' matches.
-  virtual bool Matches(Container container) const {
-    StlContainerReference stl_container = View::ConstReference(container);
-    if (stl_container.size() != count())
-      return false;
-
-    typename StlContainer::const_iterator it = stl_container.begin();
-    for (size_t i = 0; i != count();  ++it, ++i) {
-      if (!matchers_[i].Matches(*it))
-        return false;
-    }
-
-    return true;
-  }
-
-  // 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) {
-        *os << "element " << i << " ";
-        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) {
-      *os << "is not empty";
-      return;
-    }
-
-    *os << "does not have " << Elements(count()) << ", or\n";
-    for (size_t i = 0; i != count(); ++i) {
-      *os << "element " << i << " ";
-      matchers_[i].DescribeNegationTo(os);
-      if (i + 1 < count()) {
-        *os << ", or\n";
-      }
-    }
-  }
-
-  // Explains why 'container' matches, or doesn't match, this matcher.
-  virtual void ExplainMatchResultTo(Container container,
-                                    ::std::ostream* os) const {
-    StlContainerReference stl_container = View::ConstReference(container);
-    if (Matches(container)) {
-      // We need to explain why *each* element matches (the obvious
-      // ones can be skipped).
-
-      bool reason_printed = false;
-      typename StlContainer::const_iterator it = stl_container.begin();
-      for (size_t i = 0; i != count(); ++it, ++i) {
-        ::std::stringstream ss;
-        matchers_[i].ExplainMatchResultTo(*it, &ss);
-
-        const string s = ss.str();
-        if (!s.empty()) {
-          if (reason_printed) {
-            *os << ",\n";
-          }
-          *os << "element " << i << " " << s;
-          reason_printed = true;
-        }
-      }
-    } else {
-      // We need to explain why the container doesn't match.
-      const size_t actual_count = stl_container.size();
-      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.
-        if (actual_count != 0) {
-          *os << "has " << Elements(actual_count);
-        }
-        return;
-      }
-
-      // The container has the right size but at least one element
-      // doesn't match expectation.  We need to find this element and
-      // explain why it doesn't match.
-      typename StlContainer::const_iterator it = stl_container.begin();
-      for (size_t i = 0; i != count(); ++it, ++i) {
-        if (matchers_[i].Matches(*it)) {
-          continue;
-        }
-
-        *os << "element " << i << " doesn't match";
-
-        ::std::stringstream ss;
-        matchers_[i].ExplainMatchResultTo(*it, &ss);
-        const string s = ss.str();
-        if (!s.empty()) {
-          *os << " (" << s << ")";
-        }
-        return;
-      }
-    }
-  }
-
- private:
-  static Message Elements(size_t count) {
-    return Message() << count << (count == 1 ? " element" : " elements");
-  }
-
-  size_t count() const { return matchers_.size(); }
-  std::vector<Matcher<const Element&> > matchers_;
-};
-
-// Implements ElementsAre() of 0-10 arguments.
-
-class ElementsAreMatcher0 {
- public:
-  ElementsAreMatcher0() {}
-
-  template <typename Container>
-  operator Matcher<Container>() const {
-    typedef GMOCK_REMOVE_CONST_(GMOCK_REMOVE_REFERENCE_(Container))
-        RawContainer;
-    typedef typename internal::StlContainerView<RawContainer>::type::value_type
-        Element;
-
-    const Matcher<const Element&>* const matchers = NULL;
-    return MakeMatcher(new ElementsAreMatcherImpl<Container>(matchers, 0));
-  }
-};
+// Implements ElementsAre() of 1-$n arguments.
 
 
 $range i 1..n
@@ -369,28 +213,6 @@ $for j [[
 
 
 ]]
-// Implements ElementsAreArray().
-template <typename T>
-class ElementsAreArrayMatcher {
- public:
-  ElementsAreArrayMatcher(const T* first, size_t count) :
-      first_(first), count_(count) {}
-
-  template <typename Container>
-  operator Matcher<Container>() const {
-    typedef GMOCK_REMOVE_CONST_(GMOCK_REMOVE_REFERENCE_(Container))
-        RawContainer;
-    typedef typename internal::StlContainerView<RawContainer>::type::value_type
-        Element;
-
-    return MakeMatcher(new ElementsAreMatcherImpl<Container>(first_, count_));
-  }
-
- private:
-  const T* const first_;
-  const size_t count_;
-};
-
 }  // namespace internal
 
 // Args<N1, N2, ..., Nk>(a_matcher) matches a tuple if the selected
@@ -625,48 +447,6 @@ $$   // show up in the generated code.
 // To learn more about using these macros, please search for 'MATCHER'
 // on http://code.google.com/p/googlemock/wiki/CookBook.
 
-namespace testing {
-namespace internal {
-
-// Constants denoting interpolations in a matcher description string.
-const int kTupleInterpolation = -1;    // "%(*)s"
-const int kPercentInterpolation = -2;  // "%%"
-const int kInvalidInterpolation = -3;  // "%" followed by invalid text
-
-// Records the location and content of an interpolation.
-struct Interpolation {
-  Interpolation(const char* start, const char* end, int param)
-      : start_pos(start), end_pos(end), param_index(param) {}
-
-  // Points to the start of the interpolation (the '%' character).
-  const char* start_pos;
-  // Points to the first character after the interpolation.
-  const char* end_pos;
-  // 0-based index of the interpolated matcher parameter;
-  // kTupleInterpolation for "%(*)s"; kPercentInterpolation for "%%".
-  int param_index;
-};
-
-typedef ::std::vector<Interpolation> Interpolations;
-
-// Parses a matcher description string and returns a vector of
-// interpolations that appear in the string; generates non-fatal
-// failures iff 'description' is an invalid matcher description.
-// 'param_names' is a NULL-terminated array of parameter names in the
-// order they appear in the MATCHER_P*() parameter list.
-Interpolations ValidateMatcherDescription(
-    const char* param_names[], const char* description);
-
-// Returns the actual matcher description, given the matcher name,
-// user-supplied description template string, interpolations in the
-// string, and the printed values of the matcher parameters.
-string FormatMatcherDescription(
-    const char* matcher_name, const char* description,
-    const Interpolations& interp, const Strings& param_values);
-
-}  // namespace internal
-}  // namespace testing
-
 $range i 0..n
 $for i
 

include/gmock/gmock-matchers.h

@@ -1925,6 +1925,221 @@ class KeyMatcher {
   const M matcher_for_key_;
 };
 
+// Implements ElementsAre() and ElementsAreArray().
+template <typename Container>
+class ElementsAreMatcherImpl : public MatcherInterface<Container> {
+ public:
+  typedef GMOCK_REMOVE_CONST_(GMOCK_REMOVE_REFERENCE_(Container)) RawContainer;
+  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>
+  ElementsAreMatcherImpl(InputIter first, size_t count) {
+    matchers_.reserve(count);
+    InputIter it = first;
+    for (size_t i = 0; i != count; ++i, ++it) {
+      matchers_.push_back(MatcherCast<const Element&>(*it));
+    }
+  }
+
+  // Returns true iff 'container' matches.
+  virtual bool Matches(Container container) const {
+    StlContainerReference stl_container = View::ConstReference(container);
+    if (stl_container.size() != count())
+      return false;
+
+    typename StlContainer::const_iterator it = stl_container.begin();
+    for (size_t i = 0; i != count();  ++it, ++i) {
+      if (!matchers_[i].Matches(*it))
+        return false;
+    }
+
+    return true;
+  }
+
+  // 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) {
+        *os << "element " << i << " ";
+        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) {
+      *os << "is not empty";
+      return;
+    }
+
+    *os << "does not have " << Elements(count()) << ", or\n";
+    for (size_t i = 0; i != count(); ++i) {
+      *os << "element " << i << " ";
+      matchers_[i].DescribeNegationTo(os);
+      if (i + 1 < count()) {
+        *os << ", or\n";
+      }
+    }
+  }
+
+  // Explains why 'container' matches, or doesn't match, this matcher.
+  virtual void ExplainMatchResultTo(Container container,
+                                    ::std::ostream* os) const {
+    StlContainerReference stl_container = View::ConstReference(container);
+    if (Matches(container)) {
+      // We need to explain why *each* element matches (the obvious
+      // ones can be skipped).
+
+      bool reason_printed = false;
+      typename StlContainer::const_iterator it = stl_container.begin();
+      for (size_t i = 0; i != count(); ++it, ++i) {
+        ::std::stringstream ss;
+        matchers_[i].ExplainMatchResultTo(*it, &ss);
+
+        const string s = ss.str();
+        if (!s.empty()) {
+          if (reason_printed) {
+            *os << ",\n";
+          }
+          *os << "element " << i << " " << s;
+          reason_printed = true;
+        }
+      }
+    } else {
+      // We need to explain why the container doesn't match.
+      const size_t actual_count = stl_container.size();
+      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.
+        if (actual_count != 0) {
+          *os << "has " << Elements(actual_count);
+        }
+        return;
+      }
+
+      // The container has the right size but at least one element
+      // doesn't match expectation.  We need to find this element and
+      // explain why it doesn't match.
+      typename StlContainer::const_iterator it = stl_container.begin();
+      for (size_t i = 0; i != count(); ++it, ++i) {
+        if (matchers_[i].Matches(*it)) {
+          continue;
+        }
+
+        *os << "element " << i << " doesn't match";
+
+        ::std::stringstream ss;
+        matchers_[i].ExplainMatchResultTo(*it, &ss);
+        const string s = ss.str();
+        if (!s.empty()) {
+          *os << " (" << s << ")";
+        }
+        return;
+      }
+    }
+  }
+
+ private:
+  static Message Elements(size_t count) {
+    return Message() << count << (count == 1 ? " element" : " elements");
+  }
+
+  size_t count() const { return matchers_.size(); }
+  std::vector<Matcher<const Element&> > matchers_;
+};
+
+// Implements ElementsAre() of 0 arguments.
+class ElementsAreMatcher0 {
+ public:
+  ElementsAreMatcher0() {}
+
+  template <typename Container>
+  operator Matcher<Container>() const {
+    typedef GMOCK_REMOVE_CONST_(GMOCK_REMOVE_REFERENCE_(Container))
+        RawContainer;
+    typedef typename internal::StlContainerView<RawContainer>::type::value_type
+        Element;
+
+    const Matcher<const Element&>* const matchers = NULL;
+    return MakeMatcher(new ElementsAreMatcherImpl<Container>(matchers, 0));
+  }
+};
+
+// Implements ElementsAreArray().
+template <typename T>
+class ElementsAreArrayMatcher {
+ public:
+  ElementsAreArrayMatcher(const T* first, size_t count) :
+      first_(first), count_(count) {}
+
+  template <typename Container>
+  operator Matcher<Container>() const {
+    typedef GMOCK_REMOVE_CONST_(GMOCK_REMOVE_REFERENCE_(Container))
+        RawContainer;
+    typedef typename internal::StlContainerView<RawContainer>::type::value_type
+        Element;
+
+    return MakeMatcher(new ElementsAreMatcherImpl<Container>(first_, count_));
+  }
+
+ private:
+  const T* const first_;
+  const size_t count_;
+};
+
+// Constants denoting interpolations in a matcher description string.
+const int kTupleInterpolation = -1;    // "%(*)s"
+const int kPercentInterpolation = -2;  // "%%"
+const int kInvalidInterpolation = -3;  // "%" followed by invalid text
+
+// Records the location and content of an interpolation.
+struct Interpolation {
+  Interpolation(const char* start, const char* end, int param)
+      : start_pos(start), end_pos(end), param_index(param) {}
+
+  // Points to the start of the interpolation (the '%' character).
+  const char* start_pos;
+  // Points to the first character after the interpolation.
+  const char* end_pos;
+  // 0-based index of the interpolated matcher parameter;
+  // kTupleInterpolation for "%(*)s"; kPercentInterpolation for "%%".
+  int param_index;
+};
+
+typedef ::std::vector<Interpolation> Interpolations;
+
+// Parses a matcher description string and returns a vector of
+// interpolations that appear in the string; generates non-fatal
+// failures iff 'description' is an invalid matcher description.
+// 'param_names' is a NULL-terminated array of parameter names in the
+// order they appear in the MATCHER_P*() parameter list.
+Interpolations ValidateMatcherDescription(
+    const char* param_names[], const char* description);
+
+// Returns the actual matcher description, given the matcher name,
+// user-supplied description template string, interpolations in the
+// string, and the printed values of the matcher parameters.
+string FormatMatcherDescription(
+    const char* matcher_name, const char* description,
+    const Interpolations& interp, const Strings& param_values);
+
 }  // namespace internal
 
 // Implements MatcherCast().

test/gmock-generated-actions_test.cc

@@ -59,6 +59,7 @@ using testing::DoAll;
 using testing::Invoke;
 using testing::InvokeArgument;
 using testing::Return;
+using testing::ReturnArg;
 using testing::ReturnNew;
 using testing::SaveArg;
 using testing::SetArgReferee;
@@ -1382,6 +1383,21 @@ TEST(ActionPnMacroTest, CanExplicitlyInstantiateWithReferenceTypes) {
   EXPECT_EQ(55, a.Perform(empty));
 }
 
+TEST(ReturnArgActionTest, WorksForOneArgIntArg0) {
+  const Action<int(int)> a = ReturnArg<0>();
+  EXPECT_EQ(5, a.Perform(make_tuple(5)));
+}
+
+TEST(ReturnArgActionTest, WorksForMultiArgBoolArg0) {
+  const Action<bool(bool, bool, bool)> a = ReturnArg<0>();
+  EXPECT_TRUE(a.Perform(make_tuple(true, false, false)));
+}
+
+TEST(ReturnArgActionTest, WorksForMultiArgStringArg2) {
+  const Action<string(int, int, string, int)> a = ReturnArg<2>();
+  EXPECT_EQ("seven", a.Perform(make_tuple(5, 6, string("seven"), 8)));
+}
+
 TEST(SaveArgActionTest, WorksForSameType) {
   int result = 0;
   const Action<void(int n)> a1 = SaveArg<0>(&result);