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>
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___TUPLE_TUPLE_LIKE_EXT_H
53