The C and C++ Include Header Files

/usr/include/c++/11/experimental/utility


$ cat -n /usr/include/c++/11/experimental/utility

     1	// <experimental/utility> -*- C++ -*-
     2	
     3	// Copyright (C) 2015-2021 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	#if __cplusplus >= 201402L
    34	#include <utility>
    35	#include <bits/uses_allocator.h>
    36	#include <experimental/bits/lfts_config.h>
    37	
    38	namespace std {
    39	_GLIBCXX_BEGIN_NAMESPACE_VERSION
    40	
    41	namespace experimental {
    42	inline namespace fundamentals_v2 {
    43	  // 3.1.2, erased-type placeholder
    44	  using erased_type = std::__erased_type;
    45	} // namespace fundamentals_v2
    46	} // namespace experimental
    47	
    48	_GLIBCXX_END_NAMESPACE_VERSION
    49	} // namespace std
    50	
    51	#endif // C++14
    52	#endif // _GLIBCXX_EXPERIMENTAL_UTILITY