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[thirdparty/gcc.git] / libstdc++-v3 / include / experimental / array

// <experimental/array> -*- C++ -*-

// Copyright (C) 2015-2017 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.
 */

#ifndef _GLIBCXX_EXPERIMENTAL_ARRAY
#define _GLIBCXX_EXPERIMENTAL_ARRAY 1

#pragma GCC system_header

#if __cplusplus <= 201103L
# include <bits/c++14_warning.h>
#else

#include <array>
#include <experimental/type_traits>

namespace std _GLIBCXX_VISIBILITY(default)
{
namespace experimental
{
inline namespace fundamentals_v2
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

#define __cpp_lib_experimental_make_array 201505
  /**
   * @defgroup make_array Array creation functions
   * @ingroup experimental
   *
   * Array creation functions as described in N4529,
   * Working Draft, C++ Extensions for Library Fundamentals, Version 2
   *
   * @{
   */

template <typename _Up>
  struct __is_reference_wrapper : false_type
  {};

template <typename _Up>
  struct __is_reference_wrapper<reference_wrapper<_Up>> : true_type
  {};

template <typename _Dest = void, typename... _Types>
  constexpr auto
  make_array(_Types&&... __t)
    -> array<conditional_t<is_void_v<_Dest>,
                           common_type_t<_Types...>,
                           _Dest>,
             sizeof...(_Types)>
  {
    static_assert(__or_<
                  __not_<is_void<_Dest>>,
                  __and_<__not_<__is_reference_wrapper<decay_t<_Types>>>...>>
                  ::value,
                  "make_array cannot be used without an explicit target type "
                  "if any of the types given is a reference_wrapper");
    return {{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]...}};
  }

template <typename _Tp, size_t _Nm>
  constexpr array<remove_cv_t<_Tp>, _Nm>
  to_array(_Tp (&__a)[_Nm])
  {
    return __to_array(__a, make_index_sequence<_Nm>{});
  }

  // @} group make_array
  _GLIBCXX_END_NAMESPACE_VERSION
} // namespace fundamentals_v2
} // namespace experimental

} // namespace std

#endif // C++14

#endif // _GLIBCXX_EXPERIMENTAL_ARRAY