Googletest export

Merge 3bdefdb473d304803d2a38e2a2cd5cdc1827c3bd into fb49e6c164

Closes #2407

COPYBARA_INTEGRATE_REVIEW=https://github.com/google/googletest/pull/2407 from kuzkry:StaticAssertTypeEq 3bdefdb473d304803d2a38e2a2cd5cdc1827c3bd
PiperOrigin-RevId: 269255328

googletest/docs/advanced.md

@@ -464,9 +464,10 @@ You can call the function
 
 to assert that types `T1` and `T2` are the same. The function does nothing if
 the assertion is satisfied. If the types are different, the function call will
-fail to compile, and the compiler error message will likely (depending on the
-compiler) show you the actual values of `T1` and `T2`. This is mainly useful
-inside template code.
+fail to compile, the compiler error message will say that
+`type1 and type2 are not the same type` and most likely (depending on the compiler)
+show you the actual values of `T1` and `T2`. This is mainly useful inside
+template code.
 
 **Caveat**: When used inside a member function of a class template or a function
 template, `StaticAssertTypeEq<T1, T2>()` is effective only if the function is

googletest/include/gtest/gtest.h

@@ -2297,8 +2297,9 @@ class GTEST_API_ ScopedTrace {
 //
 // to cause a compiler error.
 template <typename T1, typename T2>
-bool StaticAssertTypeEq() {
-  (void)internal::StaticAssertTypeEqHelper<T1, T2>();
+constexpr bool StaticAssertTypeEq() noexcept {
+  static_assert(std::is_same<T1, T2>::value,
+                "type1 and type2 are not the same type");
   return true;
 }
 

googletest/include/gtest/internal/gtest-internal.h

@@ -1069,10 +1069,9 @@ class NativeArray {
   }
 
  private:
-  enum {
-    kCheckTypeIsNotConstOrAReference = StaticAssertTypeEqHelper<
-        Element, GTEST_REMOVE_REFERENCE_AND_CONST_(Element)>::value
-  };
+  static_assert(!std::is_const<Element>::value, "Type must not be const");
+  static_assert(!std::is_reference<Element>::value,
+                "Type must not be a reference");
 
   // Initializes this object with a copy of the input.
   void InitCopy(const Element* array, size_t a_size) {

googletest/include/gtest/internal/gtest-port.h

@@ -856,17 +856,6 @@ class Secret;
 // expression is false, compiler will issue an error containing this identifier.
 #define GTEST_COMPILE_ASSERT_(expr, msg) static_assert(expr, #msg)
 
-// StaticAssertTypeEqHelper is used by StaticAssertTypeEq defined in gtest.h.
-//
-// This template is declared, but intentionally undefined.
-template <typename T1, typename T2>
-struct StaticAssertTypeEqHelper;
-
-template <typename T>
-struct StaticAssertTypeEqHelper<T, T> {
-  enum { value = true };
-};
-
 // Evaluates to the number of elements in 'array'.
 #define GTEST_ARRAY_SIZE_(array) (sizeof(array) / sizeof(array[0]))