libcxx-compat: revert llvmorg-19-init-5639-ga10aa4485e83:

[libc++] Simplify the implementation of remove_reference (#85207)

  GCC 13 introduced the type trait `__remove_reference`. We can simplify
  the implementation of `remove_reference` a bit by using it.

This is part of making libc++ 21 build with clang 18.

PR:		292067
MFC after:	1 month

This commit is contained in:

Dimitry Andric

2026-01-05 20:54:32 +01:00

committed by

Dimitry Andric

parent bb6713d38c

commit a114ece3e6

1 changed files with 8 additions and 1 deletions

									
										contrib/llvm-project/libcxx/include/__type_traits/remove_reference.h
									
		+8
		-1
	
												View File
												
				@@ -34,7 +34,14 @@ struct remove_reference {

				template <class _Tp>

				using __libcpp_remove_reference_t = typename remove_reference<_Tp>::type;

				#else

				#  error "remove_reference not implemented!"

				// clang-format off

				template <class _Tp> struct remove_reference        {using type _LIBCPP_NODEBUG = _Tp;};

				template <class _Tp> struct remove_reference<_Tp&>  {using type _LIBCPP_NODEBUG = _Tp;};

				template <class _Tp> struct remove_reference<_Tp&&> {using type _LIBCPP_NODEBUG = _Tp;};

				// clang-format on

				template <class _Tp>

				using __libcpp_remove_reference_t = typename remove_reference<_Tp>::type;

				#endif // __has_builtin(__remove_reference_t)

				#if _LIBCPP_STD_VER >= 14