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The C and C++ Include Header Files

cat -n /usr/include/c++/15/cstdalign

     1	// <cstdalign> -*- C++ -*-
     2	
     3	// Copyright (C) 2011-2025 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 include/cstdalign
    26	 *  This is a Standard C++ Library header.
    27	 *
    28	 *  @since C++11 (removed in C++20)
    29	 */
    30	
    31	#ifndef _GLIBCXX_CSTDALIGN
    32	#define _GLIBCXX_CSTDALIGN 1
    33	
    34	#ifdef _GLIBCXX_SYSHDR
    35	#pragma GCC system_header
    36	#endif
    37	
    38	#if __cplusplus < 201103L
    39	#  include <bits/c++0x_warning.h>
    40	#else
    41	#  include <bits/c++config.h>
    42	#  if _GLIBCXX_HAVE_STDALIGN_H
    43	#    include <stdalign.h>
    44	#  endif
    45	#  if __cplusplus >= 202002L && ! _GLIBCXX_USE_DEPRECATED
    46	#    error "<cstdalign> is not a standard header in C++20, remove the #include"
    47	#  elif __cplusplus >= 201703L && defined __DEPRECATED
    48	#    pragma GCC diagnostic push
    49	#    pragma GCC diagnostic ignored "-Wc++23-extensions"
    50	#    warning "<cstdalign> is deprecated in C++17, remove the #include"
    51	#    pragma GCC diagnostic pop
    52	#  endif
    53	#endif
    54	
    55	#endif