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The C and C++ Include Header Files

/usr/include/c++/13/experimental/utility


$ cat -n /usr/include/c++/13/experimental/utility

     1	// <experimental/utility> -*- C++ -*-
     2	
     3	// Copyright (C) 2015-2023 Free Software Foundation, Inc.
     4	//
     5	// This file is part of the GNU ISO C++ Library.  This library is free
     6	// software; you can redistribute it and/or modify it under the
     7	// terms of the GNU General Public License as published by the
     8	// Free Software Foundation; either version 3, or (at your option)
     9	// any later version.
    10	
    11	// This library is distributed in the hope that it will be useful,
    12	// but WITHOUT ANY WARRANTY; without even the implied warranty of
    13	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    14	// GNU General Public License for more details.
    15	
    16	// Under Section 7 of GPL version 3, you are granted additional
    17	// permissions described in the GCC Runtime Library Exception, version
    18	// 3.1, as published by the Free Software Foundation.
    19	
    20	// You should have received a copy of the GNU General Public License and
    21	// a copy of the GCC Runtime Library Exception along with this program;
    22	// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
    23	// <http://www.gnu.org/licenses/>.
    24	
    25	/** @file experimental/utility
    26	 *  This is a TS C++ Library header.
    27	 *  @ingroup libfund-ts
    28	 */
    29	
    30	#ifndef _GLIBCXX_EXPERIMENTAL_UTILITY
    31	#define _GLIBCXX_EXPERIMENTAL_UTILITY 1
    32	
    33	#include <bits/requires_hosted.h> // experimental is currently omitted
    34	
    35	#if __cplusplus >= 201402L
    36	#include <utility>
    37	#include <bits/uses_allocator.h>
    38	#include <experimental/bits/lfts_config.h>
    39	
    40	namespace std {
    41	_GLIBCXX_BEGIN_NAMESPACE_VERSION
    42	
    43	namespace experimental {
    44	inline namespace fundamentals_v2 {
    45	  // 3.1.2, erased-type placeholder
    46	  using erased_type = std::__erased_type;
    47	} // namespace fundamentals_v2
    48	} // namespace experimental
    49	
    50	_GLIBCXX_END_NAMESPACE_VERSION
    51	} // namespace std
    52	
    53	#endif // C++14
    54	#endif // _GLIBCXX_EXPERIMENTAL_UTILITY