__cxx03/__tuple/ignore.h

0001 //===----------------------------------------------------------------------===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008
0009 #ifndef _LIBCPP___CXX03___TUPLE_IGNORE_H
0010 #define _LIBCPP___CXX03___TUPLE_IGNORE_H
0011
0012 #include <__cxx03/__config>
0013
0014 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0015 #  pragma GCC system_header
0016 #endif
0017
0018 #ifndef _LIBCPP_CXX03_LANG
0019
0020 _LIBCPP_BEGIN_NAMESPACE_STD
0021
0022 struct __ignore_type {
0023   template <class _Tp>
0024   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const __ignore_type& operator=(const _Tp&) const noexcept {
0025     return *this;
0026   }
0027 };
0028
0029 #  if _LIBCPP_STD_VER >= 17
0030 inline constexpr __ignore_type ignore;
0031 #  else
0032 constexpr __ignore_type ignore;
0033 #  endif
0034
0035 _LIBCPP_END_NAMESPACE_STD
0036
0037 #endif // _LIBCPP_CXX03_LANG
0038
0039 #endif // _LIBCPP___CXX03___TUPLE_IGNORE_H