| // <experimental/array> -*- C++ -*- |
| |
| // Copyright (C) 2015-2020 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // Under Section 7 of GPL version 3, you are granted additional |
| // permissions described in the GCC Runtime Library Exception, version |
| // 3.1, as published by the Free Software Foundation. |
| |
| // You should have received a copy of the GNU General Public License and |
| // a copy of the GCC Runtime Library Exception along with this program; |
| // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| // <http://www.gnu.org/licenses/>. |
| |
| /** @file experimental/array |
| * This is a TS C++ Library header. |
| * @ingroup libfund-ts |
| */ |
| |
| #ifndef _GLIBCXX_EXPERIMENTAL_ARRAY |
| #define _GLIBCXX_EXPERIMENTAL_ARRAY 1 |
| |
| #pragma GCC system_header |
| |
| #if __cplusplus >= 201402L |
| |
| #include <array> |
| #include <experimental/type_traits> |
| |
| namespace std _GLIBCXX_VISIBILITY(default) |
| { |
| _GLIBCXX_BEGIN_NAMESPACE_VERSION |
| |
| namespace experimental |
| { |
| inline namespace fundamentals_v2 |
| { |
| #define __cpp_lib_experimental_make_array 201505 |
| /** |
| * @defgroup make_array Array creation functions |
| * @ingroup libfund-ts |
| * |
| * Array creation functions as described in N4529, |
| * Working Draft, C++ Extensions for Library Fundamentals, Version 2 |
| * |
| * @{ |
| */ |
| |
| template<typename _Dest, typename... _Types> |
| struct __make_array_elem |
| { |
| using type = _Dest; |
| }; |
| |
| template<typename... _Types> |
| struct __make_array_elem<void, _Types...> |
| : common_type<_Types...> |
| { |
| template <typename> |
| struct __is_reference_wrapper : false_type |
| {}; |
| |
| template <typename _Up> |
| struct __is_reference_wrapper<reference_wrapper<_Up>> : true_type |
| {}; |
| |
| static_assert(!__or_<__is_reference_wrapper<decay_t<_Types>>...>::value, |
| "make_array must be used with an explicit target type when" |
| "any of the arguments is a reference_wrapper"); |
| }; |
| |
| /// Create a std::array from a variable-length list of arguments. |
| template <typename _Dest = void, typename... _Types> |
| constexpr |
| array<typename __make_array_elem<_Dest, _Types...>::type, sizeof...(_Types)> |
| make_array(_Types&&... __t) |
| { |
| return {{ std::forward<_Types>(__t)... }}; |
| } |
| |
| template <typename _Tp, size_t _Nm, size_t... _Idx> |
| constexpr array<remove_cv_t<_Tp>, _Nm> |
| __to_array(_Tp (&__a)[_Nm], index_sequence<_Idx...>) |
| { |
| return {{__a[_Idx]...}}; |
| } |
| |
| /// Create a std::array from an array. |
| template <typename _Tp, size_t _Nm> |
| constexpr array<remove_cv_t<_Tp>, _Nm> |
| to_array(_Tp (&__a)[_Nm]) |
| noexcept(is_nothrow_constructible<remove_cv_t<_Tp>, _Tp&>::value) |
| { |
| return experimental::__to_array(__a, make_index_sequence<_Nm>{}); |
| } |
| |
| // @} group make_array |
| } // namespace fundamentals_v2 |
| } // namespace experimental |
| |
| _GLIBCXX_END_NAMESPACE_VERSION |
| } // namespace std |
| |
| #endif // C++14 |
| |
| #endif // _GLIBCXX_EXPERIMENTAL_ARRAY |