__cxx03/__functional/is_transparent.h

0001 // -*- C++ -*-
0002 //===----------------------------------------------------------------------===//
0003 //
0004 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0005 // See https://llvm.org/LICENSE.txt for license information.
0006 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0007 //
0008 //===----------------------------------------------------------------------===//
0009
0010 #ifndef _LIBCPP___CXX03___FUNCTIONAL_IS_TRANSPARENT
0011 #define _LIBCPP___CXX03___FUNCTIONAL_IS_TRANSPARENT
0012
0013 #include <__cxx03/__config>
0014 #include <__cxx03/__type_traits/void_t.h>
0015
0016 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0017 #  pragma GCC system_header
0018 #endif
0019
0020 _LIBCPP_BEGIN_NAMESPACE_STD
0021
0022 #if _LIBCPP_STD_VER >= 14
0023
0024 template <class _Tp, class, class = void>
0025 inline const bool __is_transparent_v = false;
0026
0027 template <class _Tp, class _Up>
0028 inline const bool __is_transparent_v<_Tp, _Up, __void_t<typename _Tp::is_transparent> > = true;
0029
0030 #endif
0031
0032 _LIBCPP_END_NAMESPACE_STD
0033
0034 #endif // _LIBCPP___CXX03___FUNCTIONAL_IS_TRANSPARENT