libstdc++
array
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00001 // <experimental/array> -*- C++ -*-
00002 
00003 // Copyright (C) 2015-2016 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the
00007 // terms of the GNU General Public License as published by the
00008 // Free Software Foundation; either version 3, or (at your option)
00009 // any later version.
00010 
00011 // This library is distributed in the hope that it will be useful,
00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 // GNU General Public License for more details.
00015 
00016 // Under Section 7 of GPL version 3, you are granted additional
00017 // permissions described in the GCC Runtime Library Exception, version
00018 // 3.1, as published by the Free Software Foundation.
00019 
00020 // You should have received a copy of the GNU General Public License and
00021 // a copy of the GCC Runtime Library Exception along with this program;
00022 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
00023 // <http://www.gnu.org/licenses/>.
00024 
00025 /** @file experimental/array
00026  *  This is a TS C++ Library header.
00027  */
00028 
00029 #ifndef _GLIBCXX_EXPERIMENTAL_ARRAY
00030 #define _GLIBCXX_EXPERIMENTAL_ARRAY 1
00031 
00032 #pragma GCC system_header
00033 
00034 #if __cplusplus <= 201103L
00035 # include <bits/c++14_warning.h>
00036 #else
00037 
00038 #include <array>
00039 #include <functional>
00040 #include <experimental/type_traits>
00041 
00042 namespace std _GLIBCXX_VISIBILITY(default)
00043 {
00044 namespace experimental
00045 {
00046 inline namespace fundamentals_v2
00047 {
00048 _GLIBCXX_BEGIN_NAMESPACE_VERSION
00049 
00050 #define __cpp_lib_experimental_make_array 201505
00051   /**
00052    * @defgroup make_array Array creation functions
00053    * @ingroup experimental
00054    *
00055    * Array creation functions as described in N4529,
00056    * Working Draft, C++ Extensions for Library Fundamentals, Version 2
00057    *
00058    * @{
00059    */
00060 
00061 template <typename _Up>
00062   struct __is_reference_wrapper : false_type
00063   {};
00064 
00065 template <typename _Up>
00066   struct __is_reference_wrapper<reference_wrapper<_Up>> : true_type
00067   {};
00068 
00069 template <typename _Dest = void, typename... _Types>
00070   constexpr auto
00071   make_array(_Types&&... __t)
00072     -> array<conditional_t<is_void_v<_Dest>,
00073                            common_type_t<_Types...>,
00074                            _Dest>,
00075              sizeof...(_Types)>
00076   {
00077     static_assert(__or_<
00078                   __not_<is_void<_Dest>>,
00079                   __and_<__not_<__is_reference_wrapper<decay_t<_Types>>>...>>
00080                   ::value,
00081                   "make_array cannot be used without an explicit target type "
00082                   "if any of the types given is a reference_wrapper");
00083     return {{forward<_Types>(__t)...}};
00084   }
00085 
00086 template <typename _Tp, size_t _Nm, size_t... _Idx>
00087   constexpr array<remove_cv_t<_Tp>, _Nm>
00088   __to_array(_Tp (&__a)[_Nm],
00089              index_sequence<_Idx...>)
00090   {
00091     return {{__a[_Idx]...}};
00092   }
00093 
00094 template <typename _Tp, size_t _Nm>
00095   constexpr array<remove_cv_t<_Tp>, _Nm>
00096   to_array(_Tp (&__a)[_Nm])
00097   {
00098     return __to_array(__a, make_index_sequence<_Nm>{});
00099   }
00100 
00101   // @} group make_array
00102   _GLIBCXX_END_NAMESPACE_VERSION
00103 } // namespace fundamentals_v2
00104 } // namespace experimental
00105 
00106 } // namespace std
00107 
00108 #endif // C++14
00109 
00110 #endif // _GLIBCXX_EXPERIMENTAL_ARRAY