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📄 any	15,929 B	[ EDIT ] \| [ DEL ]
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📄 chrono	1,938 B	[ EDIT ] \| [ DEL ]
📄 deque	2,258 B	[ EDIT ] \| [ DEL ]
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📄 functional	12,289 B	[ EDIT ] \| [ DEL ]
📄 iterator	3,510 B	[ EDIT ] \| [ DEL ]
📄 list	2,218 B	[ EDIT ] \| [ DEL ]
📄 map	2,573 B	[ EDIT ] \| [ DEL ]
📄 memory	6,040 B	[ EDIT ] \| [ DEL ]
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📄 numeric	3,195 B	[ EDIT ] \| [ DEL ]
📄 optional	28,879 B	[ EDIT ] \| [ DEL ]
📄 propagate_const	15,311 B	[ EDIT ] \| [ DEL ]
📄 random	2,550 B	[ EDIT ] \| [ DEL ]
📄 ratio	2,416 B	[ EDIT ] \| [ DEL ]
📄 regex	2,097 B	[ EDIT ] \| [ DEL ]
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📄 string	2,817 B	[ EDIT ] \| [ DEL ]
📄 string_view	21,423 B	[ EDIT ] \| [ DEL ]
📄 system_error	2,023 B	[ EDIT ] \| [ DEL ]
📄 tuple	2,450 B	[ EDIT ] \| [ DEL ]
📄 type_traits	10,957 B	[ EDIT ] \| [ DEL ]
📄 unordered_map	2,824 B	[ EDIT ] \| [ DEL ]
📄 unordered_set	2,707 B	[ EDIT ] \| [ DEL ]
📄 utility	1,709 B	[ EDIT ] \| [ DEL ]
📄 vector	2,331 B	[ EDIT ] \| [ DEL ]

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EDIT: tuple

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

// Copyright (C) 2014-2018 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/tuple
 *  This is a TS C++ Library header.
 */

#ifndef _GLIBCXX_EXPERIMENTAL_TUPLE
#define _GLIBCXX_EXPERIMENTAL_TUPLE 1

#pragma GCC system_header

#if __cplusplus >= 201402L

#include <tuple>
#include <bits/invoke.h>
#include <experimental/bits/lfts_config.h>

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

namespace experimental
{
inline namespace fundamentals_v1
{
  // See C++14 §20.4.2.5, tuple helper classes
  template <typename _Tp>
    constexpr size_t tuple_size_v = tuple_size<_Tp>::value;

#define __cpp_lib_experimental_tuple 201402

template <typename _Fn, typename _Tuple, std::size_t... _Idx>
    constexpr decltype(auto)
    __apply_impl(_Fn&& __f, _Tuple&& __t, std::index_sequence<_Idx...>)
    {
      return std::__invoke(std::forward<_Fn>(__f),
			   std::get<_Idx>(std::forward<_Tuple>(__t))...);
    }

template <typename _Fn, typename _Tuple>
    constexpr decltype(auto)
    apply(_Fn&& __f, _Tuple&& __t)
    {
      using _Indices =
	std::make_index_sequence<tuple_size_v<std::decay_t<_Tuple>>>;
      return experimental::__apply_impl(std::forward<_Fn>(__f),
					std::forward<_Tuple>(__t),
					_Indices{});
    }
} // namespace fundamentals_v1
} // namespace experimental

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std

#endif // C++14

#endif // _GLIBCXX_EXPERIMENTAL_TUPLE