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/void_t.h>
15
16#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
17#  pragma GCC system_header
18#endif
19
20_LIBCPP_BEGIN_NAMESPACE_STD
21
22#if _LIBCPP_STD_VER >= 14
23
24template <class _Tp, class _Key = void, class = void>
25inline const bool __is_transparent_v = false;
26
27template <class _Tp, class _Key>
28inline const bool __is_transparent_v<_Tp, _Key, __void_t<typename _Tp::is_transparent> > = true;
29
30#endif
31
32_LIBCPP_END_NAMESPACE_STD
33
34#endif // _LIBCPP___FUNCTIONAL_IS_TRANSPARENT