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___FWD_GET_H
10 #define _LIBCPP___FWD_GET_H
11 
12 #include <__concepts/copyable.h>
13 #include <__config>
14 #include <__fwd/array.h>
15 #include <__fwd/pair.h>
16 #include <__fwd/subrange.h>
17 #include <__fwd/tuple.h>
18 #include <__tuple/tuple_element.h>
19 #include <cstddef>
20 
21 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
22 #  pragma GCC system_header
23 #endif
24 
25 _LIBCPP_BEGIN_NAMESPACE_STD
26 
27 #ifndef _LIBCPP_CXX03_LANG
28 
29 template <size_t _Ip, class ..._Tp>
30 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
31 typename tuple_element<_Ip, tuple<_Tp...> >::type&
32 get(tuple<_Tp...>&) _NOEXCEPT;
33 
34 template <size_t _Ip, class ..._Tp>
35 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
36 const typename tuple_element<_Ip, tuple<_Tp...> >::type&
37 get(const tuple<_Tp...>&) _NOEXCEPT;
38 
39 template <size_t _Ip, class ..._Tp>
40 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
41 typename tuple_element<_Ip, tuple<_Tp...> >::type&&
42 get(tuple<_Tp...>&&) _NOEXCEPT;
43 
44 template <size_t _Ip, class ..._Tp>
45 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
46 const typename tuple_element<_Ip, tuple<_Tp...> >::type&&
47 get(const tuple<_Tp...>&&) _NOEXCEPT;
48 
49 #endif //_LIBCPP_CXX03_LANG
50 
51 template <size_t _Ip, class _T1, class _T2>
52 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
53 typename tuple_element<_Ip, pair<_T1, _T2> >::type&
54 get(pair<_T1, _T2>&) _NOEXCEPT;
55 
56 template <size_t _Ip, class _T1, class _T2>
57 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
58 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
59 get(const pair<_T1, _T2>&) _NOEXCEPT;
60 
61 #ifndef _LIBCPP_CXX03_LANG
62 template <size_t _Ip, class _T1, class _T2>
63 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
64 typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
65 get(pair<_T1, _T2>&&) _NOEXCEPT;
66 
67 template <size_t _Ip, class _T1, class _T2>
68 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
69 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
70 get(const pair<_T1, _T2>&&) _NOEXCEPT;
71 #endif
72 
73 template <size_t _Ip, class _Tp, size_t _Size>
74 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
75 _Tp&
76 get(array<_Tp, _Size>&) _NOEXCEPT;
77 
78 template <size_t _Ip, class _Tp, size_t _Size>
79 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
80 const _Tp&
81 get(const array<_Tp, _Size>&) _NOEXCEPT;
82 
83 #ifndef _LIBCPP_CXX03_LANG
84 template <size_t _Ip, class _Tp, size_t _Size>
85 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
86 _Tp&&
87 get(array<_Tp, _Size>&&) _NOEXCEPT;
88 
89 template <size_t _Ip, class _Tp, size_t _Size>
90 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
91 const _Tp&&
92 get(const array<_Tp, _Size>&&) _NOEXCEPT;
93 #endif
94 
95 #if _LIBCPP_STD_VER >= 20
96 
97 namespace ranges {
98 
99 template <size_t _Index, class _Iter, class _Sent, subrange_kind _Kind>
100   requires((_Index == 0 && copyable<_Iter>) || _Index == 1)
101 _LIBCPP_HIDE_FROM_ABI constexpr auto get(const subrange<_Iter, _Sent, _Kind>& __subrange);
102 
103 template <size_t _Index, class _Iter, class _Sent, subrange_kind _Kind>
104   requires(_Index < 2)
105 _LIBCPP_HIDE_FROM_ABI constexpr auto get(subrange<_Iter, _Sent, _Kind>&& __subrange);
106 
107 } // namespace ranges
108 
109 using ranges::get;
110 
111 #endif // _LIBCPP_STD_VER >= 20
112 
113 _LIBCPP_END_NAMESPACE_STD
114 
115 #endif // _LIBCPP___FWD_GET_H
116