Support std::reference_wapper as a smart pointer type in gmock

PiperOrigin-RevId: 413963503
Change-Id: I33440780bf087698f4e4325399227405885430b3

Author: Abseil Team

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

@@ -76,6 +76,13 @@ template <typename Pointer>
 inline const typename Pointer::element_type* GetRawPointer(const Pointer& p) {
   return p.get();
 }
+// This overload version is for std::reference_wrapper, which does not work with
+// the overload above, as it does not have an `element_type`.
+template <typename Element>
+inline const Element* GetRawPointer(const std::reference_wrapper<Element>& r) {
+  return &r.get();
+}
+
 // This overloaded version is for the raw pointer case.
 template <typename Element>
 inline Element* GetRawPointer(Element* p) { return p; }

googlemock/test/gmock-internal-utils_test.cc

@@ -140,6 +140,12 @@ TEST(GetRawPointerTest, WorksForRawPointers) {
   EXPECT_EQ(&n, GetRawPointer(&n));
 }
 
+TEST(GetRawPointerTest, WorksForStdReferenceWrapper) {
+  int n = 1;
+  EXPECT_EQ(&n, GetRawPointer(std::ref(n)));
+  EXPECT_EQ(&n, GetRawPointer(std::cref(n)));
+}
+
 // Tests KindOf<T>.
 
 class Base {};