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The C and C++ Include Header Files

/usr/include/c++/11/execution


$ cat -n /usr/include/c++/11/execution

     1	// <execution> -*- C++ -*-
     2	
     3	// Copyright (C) 2018-2021 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	#ifndef _GLIBCXX_EXECUTION
    26	#define _GLIBCXX_EXECUTION 1
    27	
    28	#pragma GCC system_header
    29	
    30	#if __cplusplus >= 201703L
    31	# include <bits/c++config.h>
    32	# include <pstl/glue_execution_defs.h>
    33	
    34	# define _PSTL_EXECUTION_POLICIES_DEFINED 1
    35	
    36	// Algorithm implementation
    37	# if _PSTL_ALGORITHM_FORWARD_DECLARED
    38	#  include <pstl/glue_algorithm_impl.h>
    39	# endif
    40	
    41	// Numeric implementation
    42	# if _PSTL_NUMERIC_FORWARD_DECLARED
    43	#  include <pstl/glue_numeric_impl.h>
    44	# endif
    45	
    46	// Memory implementation
    47	# if _PSTL_NUMERIC_FORWARD_DECLARED
    48	#  include <pstl/glue_memory_impl.h>
    49	# endif
    50	
    51	// Feature test macro for parallel algorithms
    52	# define __cpp_lib_parallel_algorithm 201603L
    53	# define __cpp_lib_execution 201902L
    54	
    55	#endif // C++17
    56	
    57	#endif /* _GLIBCXX_EXECUTION */