libcxx/include/__cxx03/__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___CXX03___TUPLE_TUPLE_LIKE_EXT_H
  10 #define _LIBCPP___CXX03___TUPLE_TUPLE_LIKE_EXT_H
  11
  12 #include <__cxx03/__config>
  13 #include <__cxx03/__fwd/array.h>
  14 #include <__cxx03/__fwd/pair.h>
  15 #include <__cxx03/__fwd/tuple.h>
  16 #include <__cxx03/__tuple/tuple_types.h>
  17 #include <__cxx03/__type_traits/integral_constant.h>
  18 #include <__cxx03/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>
  27 struct __tuple_like_ext : false_type {};
  28
  29 template <class _Tp>
  30 struct __tuple_like_ext<const _Tp> : public __tuple_like_ext<_Tp> {};
  31 template <class _Tp>
  32 struct __tuple_like_ext<volatile _Tp> : public __tuple_like_ext<_Tp> {};
  33 template <class _Tp>
  34 struct __tuple_like_ext<const volatile _Tp> : public __tuple_like_ext<_Tp> {};
  35
  36 #ifndef _LIBCPP_CXX03_LANG
  37 template <class... _Tp>
  38 struct __tuple_like_ext<tuple<_Tp...> > : true_type {};
  39 #endif
  40
  41 template <class _T1, class _T2>
  42 struct __tuple_like_ext<pair<_T1, _T2> > : true_type {};
  43
  44 template <class _Tp, size_t _Size>
  45 struct __tuple_like_ext<array<_Tp, _Size> > : true_type {};
  46
  47 template <class... _Tp>
  48 struct __tuple_like_ext<__tuple_types<_Tp...> > : true_type {};
  49
  50 _LIBCPP_END_NAMESPACE_STD
  51
  52 #endif // _LIBCPP___CXX03___TUPLE_TUPLE_LIKE_EXT_H