Googletest export

Add gmock Matcher<std::string_view> specialization.

PiperOrigin-RevId: 294443240

7 files changed, 197 insertions, 164 deletions

diff --git a/googlemock/include/gmock/gmock-matchers.h b/googlemock/include/gmock/gmock-matchers.h
index 15cad1f1..4b6ac563 100644
--- a/googlemock/include/gmock/gmock-matchers.h
+++ b/googlemock/include/gmock/gmock-matchers.h
@@ -906,15 +906,15 @@ class StrEqualityMatcher {
                      bool case_sensitive)
       : string_(str), expect_eq_(expect_eq), case_sensitive_(case_sensitive) {}
 
-#if GTEST_HAS_ABSL
-  bool MatchAndExplain(const absl::string_view& s,
+#if GTEST_INTERNAL_HAS_STRING_VIEW
+  bool MatchAndExplain(const internal::StringView& s,
                        MatchResultListener* listener) const {
-    // This should fail to compile if absl::string_view is used with wide
+    // This should fail to compile if StringView is used with wide
     // strings.
     const StringType& str = std::string(s);
     return MatchAndExplain(str, listener);
   }
-#endif  // GTEST_HAS_ABSL
+#endif  // GTEST_INTERNAL_HAS_STRING_VIEW
 
   // Accepts pointer types, particularly:
   //   const char*
@@ -932,7 +932,7 @@ class StrEqualityMatcher {
   // Matches anything that can convert to StringType.
   //
   // This is a template, not just a plain function with const StringType&,
-  // because absl::string_view has some interfering non-explicit constructors.
+  // because StringView has some interfering non-explicit constructors.
   template <typename MatcheeStringType>
   bool MatchAndExplain(const MatcheeStringType& s,
                        MatchResultListener* /* listener */) const {
@@ -976,15 +976,15 @@ class HasSubstrMatcher {
   explicit HasSubstrMatcher(const StringType& substring)
       : substring_(substring) {}
 
-#if GTEST_HAS_ABSL
-  bool MatchAndExplain(const absl::string_view& s,
+#if GTEST_INTERNAL_HAS_STRING_VIEW
+  bool MatchAndExplain(const internal::StringView& s,
                        MatchResultListener* listener) const {
-    // This should fail to compile if absl::string_view is used with wide
+    // This should fail to compile if StringView is used with wide
     // strings.
     const StringType& str = std::string(s);
     return MatchAndExplain(str, listener);
   }
-#endif  // GTEST_HAS_ABSL
+#endif  // GTEST_INTERNAL_HAS_STRING_VIEW
 
   // Accepts pointer types, particularly:
   //   const char*
@@ -999,7 +999,7 @@ class HasSubstrMatcher {
   // Matches anything that can convert to StringType.
   //
   // This is a template, not just a plain function with const StringType&,
-  // because absl::string_view has some interfering non-explicit constructors.
+  // because StringView has some interfering non-explicit constructors.
   template <typename MatcheeStringType>
   bool MatchAndExplain(const MatcheeStringType& s,
                        MatchResultListener* /* listener */) const {
@@ -1032,15 +1032,15 @@ class StartsWithMatcher {
   explicit StartsWithMatcher(const StringType& prefix) : prefix_(prefix) {
   }
 
-#if GTEST_HAS_ABSL
-  bool MatchAndExplain(const absl::string_view& s,
+#if GTEST_INTERNAL_HAS_STRING_VIEW
+  bool MatchAndExplain(const internal::StringView& s,
                        MatchResultListener* listener) const {
-    // This should fail to compile if absl::string_view is used with wide
+    // This should fail to compile if StringView is used with wide
     // strings.
     const StringType& str = std::string(s);
     return MatchAndExplain(str, listener);
   }
-#endif  // GTEST_HAS_ABSL
+#endif  // GTEST_INTERNAL_HAS_STRING_VIEW
 
   // Accepts pointer types, particularly:
   //   const char*
@@ -1055,7 +1055,7 @@ class StartsWithMatcher {
   // Matches anything that can convert to StringType.
   //
   // This is a template, not just a plain function with const StringType&,
-  // because absl::string_view has some interfering non-explicit constructors.
+  // because StringView has some interfering non-explicit constructors.
   template <typename MatcheeStringType>
   bool MatchAndExplain(const MatcheeStringType& s,
                        MatchResultListener* /* listener */) const {
@@ -1088,15 +1088,15 @@ class EndsWithMatcher {
  public:
   explicit EndsWithMatcher(const StringType& suffix) : suffix_(suffix) {}
 
-#if GTEST_HAS_ABSL
-  bool MatchAndExplain(const absl::string_view& s,
+#if GTEST_INTERNAL_HAS_STRING_VIEW
+  bool MatchAndExplain(const internal::StringView& s,
                        MatchResultListener* listener) const {
-    // This should fail to compile if absl::string_view is used with wide
+    // This should fail to compile if StringView is used with wide
     // strings.
     const StringType& str = std::string(s);
     return MatchAndExplain(str, listener);
   }
-#endif  // GTEST_HAS_ABSL
+#endif  // GTEST_INTERNAL_HAS_STRING_VIEW
 
   // Accepts pointer types, particularly:
   //   const char*
@@ -1111,7 +1111,7 @@ class EndsWithMatcher {
   // Matches anything that can convert to StringType.
   //
   // This is a template, not just a plain function with const StringType&,
-  // because absl::string_view has some interfering non-explicit constructors.
+  // because StringView has some interfering non-explicit constructors.
   template <typename MatcheeStringType>
   bool MatchAndExplain(const MatcheeStringType& s,
                        MatchResultListener* /* listener */) const {
diff --git a/googlemock/test/gmock-matchers_test.cc b/googlemock/test/gmock-matchers_test.cc
index 2bcbe5cf..c1949e63 100644
--- a/googlemock/test/gmock-matchers_test.cc
+++ b/googlemock/test/gmock-matchers_test.cc
@@ -351,43 +351,43 @@ TEST(StringMatcherTest, CanBeImplicitlyConstructedFromString) {
   EXPECT_FALSE(m2.Matches("hello"));
 }
 
-#if GTEST_HAS_ABSL
+#if GTEST_INTERNAL_HAS_STRING_VIEW
 // Tests that a C-string literal can be implicitly converted to a
-// Matcher<absl::string_view> or Matcher<const absl::string_view&>.
+// Matcher<StringView> or Matcher<const StringView&>.
 TEST(StringViewMatcherTest, CanBeImplicitlyConstructedFromCStringLiteral) {
-  Matcher<absl::string_view> m1 = "cats";
+  Matcher<internal::StringView> m1 = "cats";
   EXPECT_TRUE(m1.Matches("cats"));
   EXPECT_FALSE(m1.Matches("dogs"));
 
-  Matcher<const absl::string_view&> m2 = "cats";
+  Matcher<const internal::StringView&> m2 = "cats";
   EXPECT_TRUE(m2.Matches("cats"));
   EXPECT_FALSE(m2.Matches("dogs"));
 }
 
 // Tests that a std::string object can be implicitly converted to a
-// Matcher<absl::string_view> or Matcher<const absl::string_view&>.
+// Matcher<StringView> or Matcher<const StringView&>.
 TEST(StringViewMatcherTest, CanBeImplicitlyConstructedFromString) {
-  Matcher<absl::string_view> m1 = std::string("cats");
+  Matcher<internal::StringView> m1 = std::string("cats");
   EXPECT_TRUE(m1.Matches("cats"));
   EXPECT_FALSE(m1.Matches("dogs"));
 
-  Matcher<const absl::string_view&> m2 = std::string("cats");
+  Matcher<const internal::StringView&> m2 = std::string("cats");
   EXPECT_TRUE(m2.Matches("cats"));
   EXPECT_FALSE(m2.Matches("dogs"));
 }
 
-// Tests that a absl::string_view object can be implicitly converted to a
-// Matcher<absl::string_view> or Matcher<const absl::string_view&>.
+// Tests that a StringView object can be implicitly converted to a
+// Matcher<StringView> or Matcher<const StringView&>.
 TEST(StringViewMatcherTest, CanBeImplicitlyConstructedFromStringView) {
-  Matcher<absl::string_view> m1 = absl::string_view("cats");
+  Matcher<internal::StringView> m1 = internal::StringView("cats");
   EXPECT_TRUE(m1.Matches("cats"));
   EXPECT_FALSE(m1.Matches("dogs"));
 
-  Matcher<const absl::string_view&> m2 = absl::string_view("cats");
+  Matcher<const internal::StringView&> m2 = internal::StringView("cats");
   EXPECT_TRUE(m2.Matches("cats"));
   EXPECT_FALSE(m2.Matches("dogs"));
 }
-#endif  // GTEST_HAS_ABSL
+#endif  // GTEST_INTERNAL_HAS_STRING_VIEW
 
 // Tests that a std::reference_wrapper<std::string> object can be implicitly
 // converted to a Matcher<std::string> or Matcher<const std::string&> via Eq().
@@ -1235,17 +1235,17 @@ TEST(StrEqTest, MatchesEqualString) {
   EXPECT_TRUE(m2.Matches("Hello"));
   EXPECT_FALSE(m2.Matches("Hi"));
 
-#if GTEST_HAS_ABSL
-  Matcher<const absl::string_view&> m3 = StrEq("Hello");
-  EXPECT_TRUE(m3.Matches(absl::string_view("Hello")));
-  EXPECT_FALSE(m3.Matches(absl::string_view("hello")));
-  EXPECT_FALSE(m3.Matches(absl::string_view()));
+#if GTEST_INTERNAL_HAS_STRING_VIEW
+  Matcher<const internal::StringView&> m3 = StrEq("Hello");
+  EXPECT_TRUE(m3.Matches(internal::StringView("Hello")));
+  EXPECT_FALSE(m3.Matches(internal::StringView("hello")));
+  EXPECT_FALSE(m3.Matches(internal::StringView()));
 
-  Matcher<const absl::string_view&> m_empty = StrEq("");
-  EXPECT_TRUE(m_empty.Matches(absl::string_view("")));
-  EXPECT_TRUE(m_empty.Matches(absl::string_view()));
-  EXPECT_FALSE(m_empty.Matches(absl::string_view("hello")));
-#endif  // GTEST_HAS_ABSL
+  Matcher<const internal::StringView&> m_empty = StrEq("");
+  EXPECT_TRUE(m_empty.Matches(internal::StringView("")));
+  EXPECT_TRUE(m_empty.Matches(internal::StringView()));
+  EXPECT_FALSE(m_empty.Matches(internal::StringView("hello")));
+#endif  // GTEST_INTERNAL_HAS_STRING_VIEW
 }
 
 TEST(StrEqTest, CanDescribeSelf) {
@@ -1272,12 +1272,12 @@ TEST(StrNeTest, MatchesUnequalString) {
   EXPECT_TRUE(m2.Matches("hello"));
   EXPECT_FALSE(m2.Matches("Hello"));
 
-#if GTEST_HAS_ABSL
-  Matcher<const absl::string_view> m3 = StrNe("Hello");
-  EXPECT_TRUE(m3.Matches(absl::string_view("")));
-  EXPECT_TRUE(m3.Matches(absl::string_view()));
-  EXPECT_FALSE(m3.Matches(absl::string_view("Hello")));
-#endif  // GTEST_HAS_ABSL
+#if GTEST_INTERNAL_HAS_STRING_VIEW
+  Matcher<const internal::StringView> m3 = StrNe("Hello");
+  EXPECT_TRUE(m3.Matches(internal::StringView("")));
+  EXPECT_TRUE(m3.Matches(internal::StringView()));
+  EXPECT_FALSE(m3.Matches(internal::StringView("Hello")));
+#endif  // GTEST_INTERNAL_HAS_STRING_VIEW
 }
 
 TEST(StrNeTest, CanDescribeSelf) {
@@ -1296,13 +1296,13 @@ TEST(StrCaseEqTest, MatchesEqualStringIgnoringCase) {
   EXPECT_TRUE(m2.Matches("hello"));
   EXPECT_FALSE(m2.Matches("Hi"));
 
-#if GTEST_HAS_ABSL
-  Matcher<const absl::string_view&> m3 = StrCaseEq(std::string("Hello"));
-  EXPECT_TRUE(m3.Matches(absl::string_view("Hello")));
-  EXPECT_TRUE(m3.Matches(absl::string_view("hello")));
-  EXPECT_FALSE(m3.Matches(absl::string_view("Hi")));
-  EXPECT_FALSE(m3.Matches(absl::string_view()));
-#endif  // GTEST_HAS_ABSL
+#if GTEST_INTERNAL_HAS_STRING_VIEW
+  Matcher<const internal::StringView&> m3 = StrCaseEq(std::string("Hello"));
+  EXPECT_TRUE(m3.Matches(internal::StringView("Hello")));
+  EXPECT_TRUE(m3.Matches(internal::StringView("hello")));
+  EXPECT_FALSE(m3.Matches(internal::StringView("Hi")));
+  EXPECT_FALSE(m3.Matches(internal::StringView()));
+#endif  // GTEST_INTERNAL_HAS_STRING_VIEW
 }
 
 TEST(StrCaseEqTest, MatchesEqualStringWith0IgnoringCase) {
@@ -1346,13 +1346,13 @@ TEST(StrCaseNeTest, MatchesUnequalStringIgnoringCase) {
   EXPECT_TRUE(m2.Matches(""));
   EXPECT_FALSE(m2.Matches("Hello"));
 
-#if GTEST_HAS_ABSL
-  Matcher<const absl::string_view> m3 = StrCaseNe("Hello");
-  EXPECT_TRUE(m3.Matches(absl::string_view("Hi")));
-  EXPECT_TRUE(m3.Matches(absl::string_view()));
-  EXPECT_FALSE(m3.Matches(absl::string_view("Hello")));
-  EXPECT_FALSE(m3.Matches(absl::string_view("hello")));
-#endif  // GTEST_HAS_ABSL
+#if GTEST_INTERNAL_HAS_STRING_VIEW
+  Matcher<const internal::StringView> m3 = StrCaseNe("Hello");
+  EXPECT_TRUE(m3.Matches(internal::StringView("Hi")));
+  EXPECT_TRUE(m3.Matches(internal::StringView()));
+  EXPECT_FALSE(m3.Matches(internal::StringView("Hello")));
+  EXPECT_FALSE(m3.Matches(internal::StringView("hello")));
+#endif  // GTEST_INTERNAL_HAS_STRING_VIEW
 }
 
 TEST(StrCaseNeTest, CanDescribeSelf) {
@@ -1393,25 +1393,25 @@ TEST(HasSubstrTest, WorksForCStrings) {
   EXPECT_FALSE(m_empty.Matches(nullptr));
 }
 
-#if GTEST_HAS_ABSL
-// Tests that HasSubstr() works for matching absl::string_view-typed values.
+#if GTEST_INTERNAL_HAS_STRING_VIEW
+// Tests that HasSubstr() works for matching StringView-typed values.
 TEST(HasSubstrTest, WorksForStringViewClasses) {
-  const Matcher<absl::string_view> m1 = HasSubstr("foo");
-  EXPECT_TRUE(m1.Matches(absl::string_view("I love food.")));
-  EXPECT_FALSE(m1.Matches(absl::string_view("tofo")));
-  EXPECT_FALSE(m1.Matches(absl::string_view()));
+  const Matcher<internal::StringView> m1 = HasSubstr("foo");
+  EXPECT_TRUE(m1.Matches(internal::StringView("I love food.")));
+  EXPECT_FALSE(m1.Matches(internal::StringView("tofo")));
+  EXPECT_FALSE(m1.Matches(internal::StringView()));
 
-  const Matcher<const absl::string_view&> m2 = HasSubstr("foo");
-  EXPECT_TRUE(m2.Matches(absl::string_view("I love food.")));
-  EXPECT_FALSE(m2.Matches(absl::string_view("tofo")));
-  EXPECT_FALSE(m2.Matches(absl::string_view()));
+  const Matcher<const internal::StringView&> m2 = HasSubstr("foo");
+  EXPECT_TRUE(m2.Matches(internal::StringView("I love food.")));
+  EXPECT_FALSE(m2.Matches(internal::StringView("tofo")));
+  EXPECT_FALSE(m2.Matches(internal::StringView()));
 
-  const Matcher<const absl::string_view&> m3 = HasSubstr("");
-  EXPECT_TRUE(m3.Matches(absl::string_view("foo")));
-  EXPECT_TRUE(m3.Matches(absl::string_view("")));
-  EXPECT_TRUE(m3.Matches(absl::string_view()));
+  const Matcher<const internal::StringView&> m3 = HasSubstr("");
+  EXPECT_TRUE(m3.Matches(internal::StringView("foo")));
+  EXPECT_TRUE(m3.Matches(internal::StringView("")));
+  EXPECT_TRUE(m3.Matches(internal::StringView()));
 }
-#endif  // GTEST_HAS_ABSL
+#endif  // GTEST_INTERNAL_HAS_STRING_VIEW
 
 // Tests that HasSubstr(s) describes itself properly.
 TEST(HasSubstrTest, CanDescribeSelf) {
@@ -1648,12 +1648,12 @@ TEST(StartsWithTest, MatchesStringWithGivenPrefix) {
   EXPECT_FALSE(m2.Matches("H"));
   EXPECT_FALSE(m2.Matches(" Hi"));
 
-#if GTEST_HAS_ABSL
-  const Matcher<absl::string_view> m_empty = StartsWith("");
-  EXPECT_TRUE(m_empty.Matches(absl::string_view()));
-  EXPECT_TRUE(m_empty.Matches(absl::string_view("")));
-  EXPECT_TRUE(m_empty.Matches(absl::string_view("not empty")));
-#endif  // GTEST_HAS_ABSL
+#if GTEST_INTERNAL_HAS_STRING_VIEW
+  const Matcher<internal::StringView> m_empty = StartsWith("");
+  EXPECT_TRUE(m_empty.Matches(internal::StringView()));
+  EXPECT_TRUE(m_empty.Matches(internal::StringView("")));
+  EXPECT_TRUE(m_empty.Matches(internal::StringView("not empty")));
+#endif  // GTEST_INTERNAL_HAS_STRING_VIEW
 }
 
 TEST(StartsWithTest, CanDescribeSelf) {
@@ -1676,13 +1676,13 @@ TEST(EndsWithTest, MatchesStringWithGivenSuffix) {
   EXPECT_FALSE(m2.Matches("i"));
   EXPECT_FALSE(m2.Matches("Hi "));
 
-#if GTEST_HAS_ABSL
-  const Matcher<const absl::string_view&> m4 = EndsWith("");
+#if GTEST_INTERNAL_HAS_STRING_VIEW
+  const Matcher<const internal::StringView&> m4 = EndsWith("");
   EXPECT_TRUE(m4.Matches("Hi"));
   EXPECT_TRUE(m4.Matches(""));
-  EXPECT_TRUE(m4.Matches(absl::string_view()));
-  EXPECT_TRUE(m4.Matches(absl::string_view("")));
-#endif  // GTEST_HAS_ABSL
+  EXPECT_TRUE(m4.Matches(internal::StringView()));
+  EXPECT_TRUE(m4.Matches(internal::StringView("")));
+#endif  // GTEST_INTERNAL_HAS_STRING_VIEW
 }
 
 TEST(EndsWithTest, CanDescribeSelf) {
@@ -1703,16 +1703,16 @@ TEST(MatchesRegexTest, MatchesStringMatchingGivenRegex) {
   EXPECT_FALSE(m2.Matches("az1"));
   EXPECT_FALSE(m2.Matches("1az"));
 
-#if GTEST_HAS_ABSL
-  const Matcher<const absl::string_view&> m3 = MatchesRegex("a.*z");
-  EXPECT_TRUE(m3.Matches(absl::string_view("az")));
-  EXPECT_TRUE(m3.Matches(absl::string_view("abcz")));
-  EXPECT_FALSE(m3.Matches(absl::string_view("1az")));
-  EXPECT_FALSE(m3.Matches(absl::string_view()));
-  const Matcher<const absl::string_view&> m4 = MatchesRegex("");
-  EXPECT_TRUE(m4.Matches(absl::string_view("")));
-  EXPECT_TRUE(m4.Matches(absl::string_view()));
-#endif  // GTEST_HAS_ABSL
+#if GTEST_INTERNAL_HAS_STRING_VIEW
+  const Matcher<const internal::StringView&> m3 = MatchesRegex("a.*z");
+  EXPECT_TRUE(m3.Matches(internal::StringView("az")));
+  EXPECT_TRUE(m3.Matches(internal::StringView("abcz")));
+  EXPECT_FALSE(m3.Matches(internal::StringView("1az")));
+  EXPECT_FALSE(m3.Matches(internal::StringView()));
+  const Matcher<const internal::StringView&> m4 = MatchesRegex("");
+  EXPECT_TRUE(m4.Matches(internal::StringView("")));
+  EXPECT_TRUE(m4.Matches(internal::StringView()));
+#endif  // GTEST_INTERNAL_HAS_STRING_VIEW
 }
 
 TEST(MatchesRegexTest, CanDescribeSelf) {
@@ -1722,10 +1722,10 @@ TEST(MatchesRegexTest, CanDescribeSelf) {
   Matcher<const char*> m2 = MatchesRegex(new RE("a.*"));
   EXPECT_EQ("matches regular expression \"a.*\"", Describe(m2));
 
-#if GTEST_HAS_ABSL
-  Matcher<const absl::string_view> m3 = MatchesRegex(new RE("0.*"));
+#if GTEST_INTERNAL_HAS_STRING_VIEW
+  Matcher<const internal::StringView> m3 = MatchesRegex(new RE("0.*"));
   EXPECT_EQ("matches regular expression \"0.*\"", Describe(m3));
-#endif  // GTEST_HAS_ABSL
+#endif  // GTEST_INTERNAL_HAS_STRING_VIEW
 }
 
 // Tests ContainsRegex().
@@ -1741,16 +1741,17 @@ TEST(ContainsRegexTest, MatchesStringContainingGivenRegex) {
   EXPECT_TRUE(m2.Matches("az1"));
   EXPECT_FALSE(m2.Matches("1a"));
 
-#if GTEST_HAS_ABSL
-  const Matcher<const absl::string_view&> m3 = ContainsRegex(new RE("a.*z"));
-  EXPECT_TRUE(m3.Matches(absl::string_view("azbz")));
-  EXPECT_TRUE(m3.Matches(absl::string_view("az1")));
-  EXPECT_FALSE(m3.Matches(absl::string_view("1a")));
-  EXPECT_FALSE(m3.Matches(absl::string_view()));
-  const Matcher<const absl::string_view&> m4 = ContainsRegex("");
-  EXPECT_TRUE(m4.Matches(absl::string_view("")));
-  EXPECT_TRUE(m4.Matches(absl::string_view()));
-#endif  // GTEST_HAS_ABSL
+#if GTEST_INTERNAL_HAS_STRING_VIEW
+  const Matcher<const internal::StringView&> m3 =
+      ContainsRegex(new RE("a.*z"));
+  EXPECT_TRUE(m3.Matches(internal::StringView("azbz")));
+  EXPECT_TRUE(m3.Matches(internal::StringView("az1")));
+  EXPECT_FALSE(m3.Matches(internal::StringView("1a")));
+  EXPECT_FALSE(m3.Matches(internal::StringView()));
+  const Matcher<const internal::StringView&> m4 = ContainsRegex("");
+  EXPECT_TRUE(m4.Matches(internal::StringView("")));
+  EXPECT_TRUE(m4.Matches(internal::StringView()));
+#endif  // GTEST_INTERNAL_HAS_STRING_VIEW
 }
 
 TEST(ContainsRegexTest, CanDescribeSelf) {
@@ -1760,10 +1761,10 @@ TEST(ContainsRegexTest, CanDescribeSelf) {
   Matcher<const char*> m2 = ContainsRegex(new RE("a.*"));
   EXPECT_EQ("contains regular expression \"a.*\"", Describe(m2));
 
-#if GTEST_HAS_ABSL
-  Matcher<const absl::string_view> m3 = ContainsRegex(new RE("0.*"));
+#if GTEST_INTERNAL_HAS_STRING_VIEW
+  Matcher<const internal::StringView> m3 = ContainsRegex(new RE("0.*"));
   EXPECT_EQ("contains regular expression \"0.*\"", Describe(m3));
-#endif  // GTEST_HAS_ABSL
+#endif  // GTEST_INTERNAL_HAS_STRING_VIEW
 }
 
 // Tests for wide strings.
diff --git a/googletest/include/gtest/gtest-matchers.h b/googletest/include/gtest/gtest-matchers.h
index d9b28e08..a61cef40 100644
--- a/googletest/include/gtest/gtest-matchers.h
+++ b/googletest/include/gtest/gtest-matchers.h
@@ -384,18 +384,18 @@ class GTEST_API_ Matcher<std::string>
   Matcher(const char* s);  // NOLINT
 };
 
-#if GTEST_HAS_ABSL
+#if GTEST_INTERNAL_HAS_STRING_VIEW
 // The following two specializations allow the user to write str
 // instead of Eq(str) and "foo" instead of Eq("foo") when a absl::string_view
 // matcher is expected.
 template <>
-class GTEST_API_ Matcher<const absl::string_view&>
-    : public internal::MatcherBase<const absl::string_view&> {
+class GTEST_API_ Matcher<const internal::StringView&>
+    : public internal::MatcherBase<const internal::StringView&> {
  public:
   Matcher() {}
 
-  explicit Matcher(const MatcherInterface<const absl::string_view&>* impl)
-      : internal::MatcherBase<const absl::string_view&>(impl) {}
+  explicit Matcher(const MatcherInterface<const internal::StringView&>* impl)
+      : internal::MatcherBase<const internal::StringView&>(impl) {}
 
   // Allows the user to write str instead of Eq(str) sometimes, where
   // str is a std::string object.
@@ -404,20 +404,20 @@ class GTEST_API_ Matcher<const absl::string_view&>
   // Allows the user to write "foo" instead of Eq("foo") sometimes.
   Matcher(const char* s);  // NOLINT
 
-  // Allows the user to pass absl::string_views directly.
-  Matcher(absl::string_view s);  // NOLINT
+  // Allows the user to pass absl::string_views or std::string_views directly.
+  Matcher(internal::StringView s);  // NOLINT
 };
 
 template <>
-class GTEST_API_ Matcher<absl::string_view>
-    : public internal::MatcherBase<absl::string_view> {
+class GTEST_API_ Matcher<internal::StringView>
+    : public internal::MatcherBase<internal::StringView> {
  public:
   Matcher() {}
 
-  explicit Matcher(const MatcherInterface<const absl::string_view&>* impl)
-      : internal::MatcherBase<absl::string_view>(impl) {}
-  explicit Matcher(const MatcherInterface<absl::string_view>* impl)
-      : internal::MatcherBase<absl::string_view>(impl) {}
+  explicit Matcher(const MatcherInterface<const internal::StringView&>* impl)
+      : internal::MatcherBase<internal::StringView>(impl) {}
+  explicit Matcher(const MatcherInterface<internal::StringView>* impl)
+      : internal::MatcherBase<internal::StringView>(impl) {}
 
   // Allows the user to write str instead of Eq(str) sometimes, where
   // str is a std::string object.
@@ -426,10 +426,10 @@ class GTEST_API_ Matcher<absl::string_view>
   // Allows the user to write "foo" instead of Eq("foo") sometimes.
   Matcher(const char* s);  // NOLINT
 
-  // Allows the user to pass absl::string_views directly.
-  Matcher(absl::string_view s);  // NOLINT
+  // Allows the user to pass absl::string_views or std::string_views directly.
+  Matcher(internal::StringView s);  // NOLINT
 };
-#endif  // GTEST_HAS_ABSL
+#endif  // GTEST_INTERNAL_HAS_STRING_VIEW
 
 // Prints a matcher in a human-readable format.
 template <typename T>
@@ -620,12 +620,12 @@ class MatchesRegexMatcher {
   MatchesRegexMatcher(const RE* regex, bool full_match)
       : regex_(regex), full_match_(full_match) {}
 
-#if GTEST_HAS_ABSL
-  bool MatchAndExplain(const absl::string_view& s,
+#if GTEST_INTERNAL_HAS_STRING_VIEW
+  bool MatchAndExplain(const internal::StringView& s,
                        MatchResultListener* listener) const {
     return MatchAndExplain(std::string(s), listener);
   }
-#endif  // GTEST_HAS_ABSL
+#endif  // GTEST_INTERNAL_HAS_STRING_VIEW
 
   // Accepts pointer types, particularly:
   //   const char*
diff --git a/googletest/include/gtest/gtest-printers.h b/googletest/include/gtest/gtest-printers.h
index c443625f..407d1f18 100644
--- a/googletest/include/gtest/gtest-printers.h
+++ b/googletest/include/gtest/gtest-printers.h
@@ -135,9 +135,9 @@ enum TypeKind {
   kProtobuf,              // a protobuf type
   kConvertibleToInteger,  // a type implicitly convertible to BiggestInt
                           // (e.g. a named or unnamed enum type)
-#if GTEST_HAS_ABSL
+#if GTEST_INTERNAL_HAS_STRING_VIEW
   kConvertibleToStringView,  // a type implicitly convertible to
-                             // absl::string_view
+                             // absl::string_view or std::string_view
 #endif
   kOtherType  // anything else
 };
@@ -191,12 +191,13 @@ class TypeWithoutFormatter<T, kConvertibleToInteger> {
   }
 };
 
-#if GTEST_HAS_ABSL
+#if GTEST_INTERNAL_HAS_STRING_VIEW
 template <typename T>
 class TypeWithoutFormatter<T, kConvertibleToStringView> {
  public:
   // Since T has neither operator<< nor PrintTo() but can be implicitly
-  // converted to absl::string_view, we print it as a absl::string_view.
+  // converted to absl::string_view, we print it as a absl::string_view
+  // (or std::string_view).
   //
   // Note: the implementation is further below, as it depends on
   // internal::PrintTo symbol which is defined later in the file.
@@ -237,9 +238,9 @@ template <typename Char, typename CharTraits, typename T>
                                      const T&, internal::BiggestInt>::value
                                      ? kConvertibleToInteger
                                      :
-#if GTEST_HAS_ABSL
+#if GTEST_INTERNAL_HAS_STRING_VIEW
                                      std::is_convertible<
-                                         const T&, absl::string_view>::value
+                                         const T&, internal::StringView>::value
                                          ? kConvertibleToStringView
                                          :
 #endif
@@ -601,12 +602,12 @@ inline void PrintTo(const ::std::wstring& s, ::std::ostream* os) {
 }
 #endif  // GTEST_HAS_STD_WSTRING
 
-#if GTEST_HAS_ABSL
-// Overload for absl::string_view.
-inline void PrintTo(absl::string_view sp, ::std::ostream* os) {
+#if GTEST_INTERNAL_HAS_STRING_VIEW
+// Overload for internal::StringView.
+inline void PrintTo(internal::StringView sp, ::std::ostream* os) {
   PrintTo(::std::string(sp), os);
 }
-#endif  // GTEST_HAS_ABSL
+#endif  // GTEST_INTERNAL_HAS_STRING_VIEW
 
 inline void PrintTo(std::nullptr_t, ::std::ostream* os) { *os << "(nullptr)"; }
 
@@ -899,12 +900,12 @@ Strings UniversalTersePrintTupleFieldsToStrings(const Tuple& value) {
 
 }  // namespace internal
 
-#if GTEST_HAS_ABSL
+#if GTEST_INTERNAL_HAS_STRING_VIEW
 namespace internal2 {
 template <typename T>
 void TypeWithoutFormatter<T, kConvertibleToStringView>::PrintValue(
     const T& value, ::std::ostream* os) {
-  internal::PrintTo(absl::string_view(value), os);
+  internal::PrintTo(internal::StringView(value), os);
 }
 }  // namespace internal2
 #endif
diff --git a/googletest/include/gtest/internal/gtest-port.h b/googletest/include/gtest/internal/gtest-port.h
index 0543da54..60ff4716 100644
--- a/googletest/include/gtest/internal/gtest-port.h
+++ b/googletest/include/gtest/internal/gtest-port.h
@@ -199,6 +199,9 @@
 //                                        suppressed (constant conditional).
 //   GTEST_INTENTIONAL_CONST_COND_POP_  - finish code section where MSVC C4127
 //                                        is suppressed.
+//   GTEST_INTERNAL_HAS_STRING_VIEW - for enabling Matcher<std::string_view> or
+//                                    Matcher<absl::string_view>
+//                                    specializations.
 //
 // Synchronization:
 //   Mutex, MutexLock, ThreadLocal, GetThreadCount()
@@ -2220,4 +2223,32 @@ const char* StringFromGTestEnv(const char* flag, const char* default_val);
 
 #endif  // !defined(GTEST_INTERNAL_DEPRECATED)
 
+#if GTEST_HAS_ABSL
+// Always use absl::string_view for Matcher<> specializations if googletest
+// is built with absl support.
+# define GTEST_INTERNAL_HAS_STRING_VIEW 1
+#include "absl/strings/string_view.h"
+namespace testing {
+namespace internal {
+using StringView = ::absl::string_view;
+}  // namespace internal
+}  // namespace testing
+#else
+# ifdef __has_include
+#   if __has_include(<string_view>) && __cplusplus >= 201703L
+// Otherwise for C++17 and higher use std::string_view for Matcher<>
+// specializations.
+#   define GTEST_INTERNAL_HAS_STRING_VIEW 1
+#include <string_view>
+namespace testing {
+namespace internal {
+using StringView = ::std::string_view;
+}  // namespace internal
+}  // namespace testing
+// The case where absl is configured NOT to alias std::string_view is not
+// supported.
+#  endif  // __has_include(<string_view>) && __cplusplus >= 201703L
+# endif  // __has_include
+#endif  // GTEST_HAS_ABSL
+
 #endif  // GTEST_INCLUDE_GTEST_INTERNAL_GTEST_PORT_H_
diff --git a/googletest/src/gtest-matchers.cc b/googletest/src/gtest-matchers.cc
index 7d2fb685..65104eba 100644
--- a/googletest/src/gtest-matchers.cc
+++ b/googletest/src/gtest-matchers.cc
@@ -58,40 +58,40 @@ Matcher<std::string>::Matcher(const std::string& s) { *this = Eq(s); }
 // s.
 Matcher<std::string>::Matcher(const char* s) { *this = Eq(std::string(s)); }
 
-#if GTEST_HAS_ABSL
-// Constructs a matcher that matches a const absl::string_view& whose value is
+#if GTEST_INTERNAL_HAS_STRING_VIEW
+// Constructs a matcher that matches a const StringView& whose value is
 // equal to s.
-Matcher<const absl::string_view&>::Matcher(const std::string& s) {
+Matcher<const internal::StringView&>::Matcher(const std::string& s) {
   *this = Eq(s);
 }
 
-// Constructs a matcher that matches a const absl::string_view& whose value is
+// Constructs a matcher that matches a const StringView& whose value is
 // equal to s.
-Matcher<const absl::string_view&>::Matcher(const char* s) {
+Matcher<const internal::StringView&>::Matcher(const char* s) {
   *this = Eq(std::string(s));
 }
 
-// Constructs a matcher that matches a const absl::string_view& whose value is
+// Constructs a matcher that matches a const StringView& whose value is
 // equal to s.
-Matcher<const absl::string_view&>::Matcher(absl::string_view s) {
+Matcher<const internal::StringView&>::Matcher(internal::StringView s) {
   *this = Eq(std::string(s));
 }
 
-// Constructs a matcher that matches a absl::string_view whose value is equal to
+// Constructs a matcher that matches a StringView whose value is equal to
 // s.
-Matcher<absl::string_view>::Matcher(const std::string& s) { *this = Eq(s); }
+Matcher<internal::StringView>::Matcher(const std::string& s) { *this = Eq(s); }
 
-// Constructs a matcher that matches a absl::string_view whose value is equal to
+// Constructs a matcher that matches a StringView whose value is equal to
 // s.
-Matcher<absl::string_view>::Matcher(const char* s) {
+Matcher<internal::StringView>::Matcher(const char* s) {
   *this = Eq(std::string(s));
 }
 
-// Constructs a matcher that matches a absl::string_view whose value is equal to
+// Constructs a matcher that matches a StringView whose value is equal to
 // s.
-Matcher<absl::string_view>::Matcher(absl::string_view s) {
+Matcher<internal::StringView>::Matcher(internal::StringView s) {
   *this = Eq(std::string(s));
 }
-#endif  // GTEST_HAS_ABSL
+#endif  // GTEST_INTERNAL_HAS_STRING_VIEW
 
 }  // namespace testing
diff --git a/googletest/test/googletest-printers-test.cc b/googletest/test/googletest-printers-test.cc
index bf37fb45..ddf2c0e1 100644
--- a/googletest/test/googletest-printers-test.cc
+++ b/googletest/test/googletest-printers-test.cc
@@ -760,22 +760,22 @@ TEST(PrintTypeWithGenericStreamingTest, TypeImplicitlyConvertible) {
   EXPECT_EQ("AllowsGenericStreamingAndImplicitConversionTemplate", Print(a));
 }
 
-#if GTEST_HAS_ABSL
+#if GTEST_INTERNAL_HAS_STRING_VIEW
 
-// Tests printing ::absl::string_view.
+// Tests printing internal::StringView.
 
 TEST(PrintStringViewTest, SimpleStringView) {
-  const ::absl::string_view sp = "Hello";
+  const internal::StringView sp = "Hello";
   EXPECT_EQ("\"Hello\"", Print(sp));
 }
 
 TEST(PrintStringViewTest, UnprintableCharacters) {
   const char str[] = "NUL (\0) and \r\t";
-  const ::absl::string_view sp(str, sizeof(str) - 1);
+  const internal::StringView sp(str, sizeof(str) - 1);
   EXPECT_EQ("\"NUL (\\0) and \\r\\t\"", Print(sp));
 }
 
-#endif  // GTEST_HAS_ABSL
+#endif  // GTEST_INTERNAL_HAS_STRING_VIEW
 
 // Tests printing STL containers.