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The C and C++ Include Header Files

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

     1	// Iostreams base classes -*- C++ -*-
     2	
     3	// Copyright (C) 1997-2025 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/ios
    26	 *  This is a Standard C++ Library header.
    27	 */
    28	
    29	//
    30	// ISO C++ 14882: 27.4  Iostreams base classes
    31	//
    32	
    33	#ifndef _GLIBCXX_IOS
    34	#define _GLIBCXX_IOS 1
    35	
    36	#ifdef _GLIBCXX_SYSHDR
    37	#pragma GCC system_header
    38	#endif
    39	
    40	#include <bits/requires_hosted.h> // iostreams
    41	
    42	#include <iosfwd>
    43	#include <exception> 		// For ios_base::failure
    44	#include <bits/char_traits.h> 	// For char_traits, streamoff, streamsize, fpos
    45	#include <bits/localefwd.h>	// For class locale
    46	#include <bits/ios_base.h>	// For ios_base declarations.
    47	#include <streambuf>
    48	#include <bits/basic_ios.h>
    49	
    50	#define __glibcxx_want_ios_noreplace
    51	#include <bits/version.h>
    52	
    53	#endif	/* _GLIBCXX_IOS */