Merge pull request #1220 from romkatv/property-matcher

Support ref-qualified member functions in Property().

googlemock/include/gmock/gmock-matchers.h

@@ -2232,7 +2232,10 @@ class FieldMatcher {
 
 // Implements the Property() matcher for matching a property
 // (i.e. return value of a getter method) of an object.
-template <typename Class, typename PropertyType>
+//
+// Property is a const-qualified member function of Class returning
+// PropertyType.
+template <typename Class, typename PropertyType, typename Property>
 class PropertyMatcher {
  public:
   // The property may have a reference type, so 'const PropertyType&'
@@ -2241,8 +2244,7 @@ class PropertyMatcher {
   // PropertyType being a reference or not.
   typedef GTEST_REFERENCE_TO_CONST_(PropertyType) RefToConstProperty;
 
-  PropertyMatcher(PropertyType (Class::*property)() const,
+  PropertyMatcher(Property property, const Matcher<RefToConstProperty>& matcher)
-                  const Matcher<RefToConstProperty>& matcher)
       : property_(property), matcher_(matcher) {}
 
   void DescribeTo(::std::ostream* os) const {
@@ -2295,7 +2297,7 @@ class PropertyMatcher {
     return MatchAndExplainImpl(false_type(), *p, listener);
   }
 
-  PropertyType (Class::*property_)() const;
+  Property property_;
   const Matcher<RefToConstProperty> matcher_;
 
   GTEST_DISALLOW_ASSIGN_(PropertyMatcher);
@@ -3908,11 +3910,13 @@ inline PolymorphicMatcher<
 //   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<
+inline PolymorphicMatcher<internal::PropertyMatcher<
-  internal::PropertyMatcher<Class, PropertyType> > Property(
+    Class, PropertyType, PropertyType (Class::*)() const> >
-    PropertyType (Class::*property)() const, const PropertyMatcher& matcher) {
+Property(PropertyType (Class::*property)() const,
+         const PropertyMatcher& matcher) {
   return MakePolymorphicMatcher(
-      internal::PropertyMatcher<Class, PropertyType>(
+      internal::PropertyMatcher<Class, PropertyType,
+                                PropertyType (Class::*)() const>(
           property,
           MatcherCast<GTEST_REFERENCE_TO_CONST_(PropertyType)>(matcher)));
   // The call to MatcherCast() is required for supporting inner
@@ -3921,6 +3925,21 @@ inline PolymorphicMatcher<
   // to compile where bar() returns an int32 and m is a matcher for int64.
 }
 
+#if GTEST_LANG_CXX11
+// The same as above but for reference-qualified member functions.
+template <typename Class, typename PropertyType, typename PropertyMatcher>
+inline PolymorphicMatcher<internal::PropertyMatcher<
+    Class, PropertyType, PropertyType (Class::*)() const &> >
+Property(PropertyType (Class::*property)() const &,
+         const PropertyMatcher& matcher) {
+  return MakePolymorphicMatcher(
+      internal::PropertyMatcher<Class, PropertyType,
+                                PropertyType (Class::*)() const &>(
+          property,
+          MatcherCast<GTEST_REFERENCE_TO_CONST_(PropertyType)>(matcher)));
+}
+#endif
+
 // Creates a matcher that matches an object iff the result of applying
 // a callable to x matches 'matcher'.
 // For example,

googlemock/test/gmock-matchers_test.cc

@@ -3588,10 +3588,15 @@ class AClass {
   // A getter that returns a reference to const.
   const std::string& s() const { return s_; }
 
+#if GTEST_LANG_CXX11
+  const std::string& s_ref() const & { return s_; }
+#endif
+
   void set_s(const std::string& new_s) { s_ = new_s; }
 
   // A getter that returns a reference to non-const.
   double& x() const { return x_; }
+
  private:
   int n_;
   std::string s_;
@@ -3635,6 +3640,21 @@ TEST(PropertyTest, WorksForReferenceToConstProperty) {
   EXPECT_FALSE(m.Matches(a));
 }
 
+#if GTEST_LANG_CXX11
+// Tests that Property(&Foo::property, ...) works when property() is
+// ref-qualified.
+TEST(PropertyTest, WorksForRefQualifiedProperty) {
+  Matcher<const AClass&> m = Property(&AClass::s_ref, StartsWith("hi"));
+
+  AClass a;
+  a.set_s("hill");
+  EXPECT_TRUE(m.Matches(a));
+
+  a.set_s("hole");
+  EXPECT_FALSE(m.Matches(a));
+}
+#endif
+
 // Tests that Property(&Foo::property, ...) works when property()
 // returns a reference to non-const.
 TEST(PropertyTest, WorksForReferenceToNonConstProperty) {