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The C and C++ Include Header Files

/usr/include/c++/13/experimental/chrono


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

     1	// Variable Templates For chrono -*- C++ -*-
     2	
     3	// Copyright (C) 2014-2023 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/chrono
    26	 *  This is a TS C++ Library header.
    27	 *  @ingroup libfund-ts
    28	 */
    29	
    30	//
    31	// N3932 Variable Templates For Type Traits (Revision 1)
    32	//
    33	
    34	#ifndef _GLIBCXX_EXPERIMENTAL_CHRONO
    35	#define _GLIBCXX_EXPERIMENTAL_CHRONO 1
    36	
    37	#pragma GCC system_header
    38	
    39	#include <bits/requires_hosted.h> // experimental is currently omitted
    40	
    41	#if __cplusplus >= 201402L
    42	
    43	#include <bits/chrono.h> // Only the C++14 parts of <chrono>
    44	#include <experimental/bits/lfts_config.h>
    45	
    46	namespace std _GLIBCXX_VISIBILITY(default)
    47	{
    48	_GLIBCXX_BEGIN_NAMESPACE_VERSION
    49	
    50	namespace chrono {
    51	namespace experimental
    52	{
    53	inline namespace fundamentals_v1
    54	{
    55	// See C++14 20.12.4, customization traits
    56	template <typename _Rep>
    57	   constexpr bool treat_as_floating_point_v =
    58	     treat_as_floating_point<_Rep>::value;
    59	} // namespace fundamentals_v1
    60	} // namespace experimental
    61	} // namespace chrono
    62	_GLIBCXX_END_NAMESPACE_VERSION
    63	} // namespace std
    64	
    65	#endif // __cplusplus <= 201103L
    66	
    67	#endif // _GLIBCXX_EXPERIMENTAL_CHRONO