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 <__fwd/array.h> 14 #include <__fwd/tuple.h> 15 #include <__tuple/tuple_element.h> 16 #include <__tuple/tuple_indices.h> 17 #include <__tuple/tuple_size.h> 18 #include <__tuple/tuple_types.h> 19 #include <__type_traits/copy_cvref.h> 20 #include <__type_traits/remove_cv.h> 21 #include <__type_traits/remove_reference.h> 22 #include <cstddef> 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 = _Vt; 51 template <class _Tp> 52 using __apply_quals = __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 = __remove_cv_t<__libcpp_remove_reference_t<_Tp> >; 62 using _Maker = __make_tuple_types_flat<_RawTp, typename __make_tuple_indices<_Ep, _Sp>::type>; 63 using type = 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 typedef _LIBCPP_NODEBUG __tuple_types<_Types...> type; 69 }; 70 71 template <class... _Types, size_t _Ep> 72 struct __make_tuple_types<__tuple_types<_Types...>, _Ep, 0, true> { 73 typedef _LIBCPP_NODEBUG __tuple_types<_Types...> type; 74 }; 75 76 _LIBCPP_END_NAMESPACE_STD 77 78 #endif // _LIBCPP_CXX03_LANG 79 80 #endif // _LIBCPP___TUPLE_MAKE_TUPLE_TYPES_H 81