1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5 // See https://llvm.org/LICENSE.txt for license information. 6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef _LIBCPP___FUNCTIONAL_IS_TRANSPARENT 11 #define _LIBCPP___FUNCTIONAL_IS_TRANSPARENT 12 13 #include <__config> 14 #include <__type_traits/integral_constant.h> 15 #include <__type_traits/void_t.h> 16 17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18 # pragma GCC system_header 19 #endif 20 21 _LIBCPP_BEGIN_NAMESPACE_STD 22 23 #if _LIBCPP_STD_VER >= 14 24 25 template <class _Tp, class, class = void> 26 struct __is_transparent : false_type {}; 27 28 template <class _Tp, class _Up> 29 struct __is_transparent<_Tp, _Up, __void_t<typename _Tp::is_transparent> > 30 : true_type {}; 31 32 #endif 33 34 _LIBCPP_END_NAMESPACE_STD 35 36 #endif // _LIBCPP___FUNCTIONAL_IS_TRANSPARENT 37