libcxx/include/__tuple/tuple_like_ext.h

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef _LIBCPP___TUPLE_TUPLE_LIKE_EXT_H
  10 #define _LIBCPP___TUPLE_TUPLE_LIKE_EXT_H
  11
  12 #include <__config>
  13 #include <__fwd/array.h>
  14 #include <__fwd/pair.h>
  15 #include <__fwd/tuple.h>
  16 #include <__tuple/tuple_types.h>
  17 #include <__type_traits/integral_constant.h>
  18 #include <cstddef>
  19
  20 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  21 #  pragma GCC system_header
  22 #endif
  23
  24 _LIBCPP_BEGIN_NAMESPACE_STD
  25
  26 template <class _Tp> struct __tuple_like_ext : false_type {};
  27
  28 template <class _Tp> struct __tuple_like_ext<const _Tp> : public __tuple_like_ext<_Tp> {};
  29 template <class _Tp> struct __tuple_like_ext<volatile _Tp> : public __tuple_like_ext<_Tp> {};
  30 template <class _Tp> struct __tuple_like_ext<const volatile _Tp> : public __tuple_like_ext<_Tp> {};
  31
  32 #ifndef _LIBCPP_CXX03_LANG
  33 template <class... _Tp> struct __tuple_like_ext<tuple<_Tp...> > : true_type {};
  34 #endif
  35
  36 template <class _T1, class _T2> struct __tuple_like_ext<pair<_T1, _T2> > : true_type {};
  37
  38 template <class _Tp, size_t _Size> struct __tuple_like_ext<array<_Tp, _Size> > : true_type {};
  39
  40 template <class... _Tp> struct __tuple_like_ext<__tuple_types<_Tp...> > : true_type {};
  41
  42 _LIBCPP_END_NAMESPACE_STD
  43
  44 #endif // _LIBCPP___TUPLE_TUPLE_LIKE_EXT_H