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| 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_MAKE_TUPLE_TYPES_H |
| 10 | #define _LIBCPP___TUPLE_MAKE_TUPLE_TYPES_H |
| 11 | |
| 12 | #include <__config> |
| 13 | #include <__cstddef/size_t.h> |
| 14 | #include <__fwd/array.h> |
| 15 | #include <__fwd/tuple.h> |
| 16 | #include <__tuple/tuple_element.h> |
| 17 | #include <__tuple/tuple_indices.h> |
| 18 | #include <__tuple/tuple_size.h> |
| 19 | #include <__tuple/tuple_types.h> |
| 20 | #include <__type_traits/copy_cvref.h> |
| 21 | #include <__type_traits/remove_cvref.h> |
| 22 | #include <__type_traits/remove_reference.h> |
| 23 | |
| 24 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 25 | # pragma GCC system_header |
| 26 | #endif |
| 27 | |
| 28 | #ifndef _LIBCPP_CXX03_LANG |
| 29 | |
| 30 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 31 | |
| 32 | // __make_tuple_types<_Tuple<_Types...>, _Ep, _Sp>::type is a |
| 33 | // __tuple_types<_Types...> using only those _Types in the range [_Sp, _Ep). |
| 34 | // _Sp defaults to 0 and _Ep defaults to tuple_size<_Tuple>. If _Tuple is a |
| 35 | // lvalue_reference type, then __tuple_types<_Types&...> is the result. |
| 36 | |
| 37 | template <class _TupleTypes, class _TupleIndices> |
| 38 | struct __make_tuple_types_flat; |
| 39 | |
| 40 | template <template <class...> class _Tuple, class... _Types, size_t... _Idx> |
| 41 | struct __make_tuple_types_flat<_Tuple<_Types...>, __tuple_indices<_Idx...>> { |
| 42 | // Specialization for pair, tuple, and __tuple_types |
| 43 | template <class _Tp> |
| 44 | using __apply_quals _LIBCPP_NODEBUG = __tuple_types<__copy_cvref_t<_Tp, __type_pack_element<_Idx, _Types...>>...>; |
| 45 | }; |
| 46 | |
| 47 | template <class _Vt, size_t _Np, size_t... _Idx> |
| 48 | struct __make_tuple_types_flat<array<_Vt, _Np>, __tuple_indices<_Idx...>> { |
| 49 | template <size_t> |
| 50 | using __value_type _LIBCPP_NODEBUG = _Vt; |
| 51 | template <class _Tp> |
| 52 | using __apply_quals _LIBCPP_NODEBUG = __tuple_types<__copy_cvref_t<_Tp, __value_type<_Idx>>...>; |
| 53 | }; |
| 54 | |
| 55 | template <class _Tp, |
| 56 | size_t _Ep = tuple_size<__libcpp_remove_reference_t<_Tp> >::value, |
| 57 | size_t _Sp = 0, |
| 58 | bool _SameSize = (_Ep == tuple_size<__libcpp_remove_reference_t<_Tp> >::value)> |
| 59 | struct __make_tuple_types { |
| 60 | static_assert(_Sp <= _Ep, "__make_tuple_types input error"); |
| 61 | using _RawTp _LIBCPP_NODEBUG = __remove_cvref_t<_Tp>; |
| 62 | using _Maker _LIBCPP_NODEBUG = __make_tuple_types_flat<_RawTp, typename __make_tuple_indices<_Ep, _Sp>::type>; |
| 63 | using type _LIBCPP_NODEBUG = typename _Maker::template __apply_quals<_Tp>; |
| 64 | }; |
| 65 | |
| 66 | template <class... _Types, size_t _Ep> |
| 67 | struct __make_tuple_types<tuple<_Types...>, _Ep, 0, true> { |
| 68 | using type _LIBCPP_NODEBUG = __tuple_types<_Types...>; |
| 69 | }; |
| 70 | |
| 71 | template <class... _Types, size_t _Ep> |
| 72 | struct __make_tuple_types<__tuple_types<_Types...>, _Ep, 0, true> { |
| 73 | using type _LIBCPP_NODEBUG = __tuple_types<_Types...>; |
| 74 | }; |
| 75 | |
| 76 | _LIBCPP_END_NAMESPACE_STD |
| 77 | |
| 78 | #endif // _LIBCPP_CXX03_LANG |
| 79 | |
| 80 | #endif // _LIBCPP___TUPLE_MAKE_TUPLE_TYPES_H |
| 81 |
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