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>
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 > 11
23
24template <class _Tp, class, class = void>
25struct __is_transparent : false_type {};
26
27template <class _Tp, class _Up>
28struct __is_transparent<_Tp, _Up, __void_t<typename _Tp::is_transparent> >
29   : true_type {};
30
31#endif
32
33_LIBCPP_END_NAMESPACE_STD
34
35#endif // _LIBCPP___FUNCTIONAL_IS_TRANSPARENT
36