Googletest export

Deduce SizeType for SizeIs() from the return value of the size() member function

PiperOrigin-RevId: 223835674

2 files changed, 12 insertions, 3 deletions

diff --git a/googlemock/include/gmock/gmock-matchers.h b/googlemock/include/gmock/gmock-matchers.h
index 801c8df..b859f1a 100644
--- a/googlemock/include/gmock/gmock-matchers.h
+++ b/googlemock/include/gmock/gmock-matchers.h
@@ -1955,9 +1955,7 @@ class SizeIsMatcher {
   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;
+    using SizeType = decltype(std::declval<Container>().size());
     explicit Impl(const SizeMatcher& size_matcher)
         : size_matcher_(MatcherCast<SizeType>(size_matcher)) {}
 
diff --git a/googlemock/test/gmock-matchers_test.cc b/googlemock/test/gmock-matchers_test.cc
index 5dc09f3..dd4931b 100644
--- a/googlemock/test/gmock-matchers_test.cc
+++ b/googlemock/test/gmock-matchers_test.cc
@@ -4821,6 +4821,17 @@ TEST(SizeIsTest, WorksWithReferences) {
   EXPECT_THAT(container, m);
 }
 
+// SizeIs should work for any type that provides a size() member function.
+// For example, a size_type member type should not need to be provided.
+struct MinimalistCustomType {
+  int size() const { return 1; }
+};
+TEST(SizeIsTest, WorksWithMinimalistCustomType) {
+  MinimalistCustomType container;
+  EXPECT_THAT(container, SizeIs(1));
+  EXPECT_THAT(container, Not(SizeIs(0)));
+}
+
 TEST(SizeIsTest, CanDescribeSelf) {
   Matcher<vector<int> > m = SizeIs(2);
   EXPECT_EQ("size is equal to 2", Describe(m));