Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/contrib/llvm-project/libcxx/include/__tuple/tuple_element.h
35234 views
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_ELEMENT_H

10
#define _LIBCPP___TUPLE_TUPLE_ELEMENT_H

11


12
#include <__config>

13
#include <__tuple/tuple_indices.h>

14
#include <__tuple/tuple_types.h>

15
#include <cstddef>

16


17
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)

18
#  pragma GCC system_header

19
#endif

20


21
_LIBCPP_BEGIN_NAMESPACE_STD

22


23
template <size_t _Ip, class _Tp>

24
struct _LIBCPP_TEMPLATE_VIS tuple_element;

25


26
template <size_t _Ip, class _Tp>

27
struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, const _Tp> {

28
  typedef _LIBCPP_NODEBUG const typename tuple_element<_Ip, _Tp>::type type;

29
};

30


31
template <size_t _Ip, class _Tp>

32
struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, volatile _Tp> {

33
  typedef _LIBCPP_NODEBUG volatile typename tuple_element<_Ip, _Tp>::type type;

34
};

35


36
template <size_t _Ip, class _Tp>

37
struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, const volatile _Tp> {

38
  typedef _LIBCPP_NODEBUG const volatile typename tuple_element<_Ip, _Tp>::type type;

39
};

40


41
#ifndef _LIBCPP_CXX03_LANG

42


43
#  if !__has_builtin(__type_pack_element)

44


45
namespace __indexer_detail {

46


47
template <size_t _Idx, class _Tp>

48
struct __indexed {

49
  using type _LIBCPP_NODEBUG = _Tp;

50
};

51


52
template <class _Types, class _Indexes>

53
struct __indexer;

54


55
template <class... _Types, size_t... _Idx>

56
struct __indexer<__tuple_types<_Types...>, __tuple_indices<_Idx...>> : __indexed<_Idx, _Types>... {};

57


58
template <size_t _Idx, class _Tp>

59
__indexed<_Idx, _Tp> __at_index(__indexed<_Idx, _Tp> const&);

60


61
} // namespace __indexer_detail

62


63
template <size_t _Idx, class... _Types>

64
using __type_pack_element _LIBCPP_NODEBUG = typename decltype(__indexer_detail::__at_index<_Idx>(

65
    __indexer_detail::__indexer< __tuple_types<_Types...>,

66
                                 typename __make_tuple_indices<sizeof...(_Types)>::type >{}))::type;

67
#  endif

68


69
template <size_t _Ip, class... _Types>

70
struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, __tuple_types<_Types...> > {

71
  static_assert(_Ip < sizeof...(_Types), "tuple_element index out of range");

72
  typedef _LIBCPP_NODEBUG __type_pack_element<_Ip, _Types...> type;

73
};

74


75
#  if _LIBCPP_STD_VER >= 14

76
template <size_t _Ip, class... _Tp>

77
using tuple_element_t _LIBCPP_NODEBUG = typename tuple_element<_Ip, _Tp...>::type;

78
#  endif

79


80
#endif // _LIBCPP_CXX03_LANG

81


82
_LIBCPP_END_NAMESPACE_STD

83


84
#endif // _LIBCPP___TUPLE_TUPLE_ELEMENT_H

85


86