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The C and C++ Include Header Files

cat -n /usr/include/c++/15/backward/backward_warning.h

     1	// Copyright (C) 2001-2025 Free Software Foundation, Inc.
     2	//
     3	// This file is part of the GNU ISO C++ Library.  This library is free
     4	// software; you can redistribute it and/or modify it under the
     5	// terms of the GNU General Public License as published by the
     6	// Free Software Foundation; either version 3, or (at your option)
     7	// any later version.
     8	
     9	// This library is distributed in the hope that it will be useful,
    10	// but WITHOUT ANY WARRANTY; without even the implied warranty of
    11	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    12	// GNU General Public License for more details.
    13	
    14	// Under Section 7 of GPL version 3, you are granted additional
    15	// permissions described in the GCC Runtime Library Exception, version
    16	// 3.1, as published by the Free Software Foundation.
    17	
    18	// You should have received a copy of the GNU General Public License and
    19	// a copy of the GCC Runtime Library Exception along with this program;
    20	// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
    21	// <http://www.gnu.org/licenses/>.
    22	
    23	/** @file backward/backward_warning.h
    24	 *  This is an internal header file, included by other library headers.
    25	 *  Do not attempt to use it directly. @headername{iosfwd}
    26	 */
    27	
    28	#ifndef _BACKWARD_BACKWARD_WARNING_H
    29	#define _BACKWARD_BACKWARD_WARNING_H 1
    30	
    31	#ifdef __DEPRECATED
    32	#warning \
    33	  This file includes at least one deprecated or antiquated header which \
    34	  may be removed without further notice at a future date. Please use a \
    35	  non-deprecated interface with equivalent functionality instead. For a \
    36	  listing of replacement headers and interfaces, consult the file \
    37	  backward_warning.h. To disable this warning use -Wno-deprecated.
    38	
    39	/*
    40	  A list of valid replacements is as follows:
    41	
    42	  Use:					Instead of:
    43	  <sstream>, stringbuf
    44	    or <spanstream>, spanbuf		<strstream>, strstreambuf
    45	  <sstream>, istringstream
    46	    or <spanstream>, ispanstream	<strstream>, istrstream
    47	  <sstream>, ostringstream
    48	    or <spanstream>, ospanstream	<strstream>, ostrstream
    49	  <sstream>, stringstream
    50	    or <spanstream>, spanstream		<strstream>, strstream
    51	  <unordered_set>, unordered_set     	<ext/hash_set>, hash_set
    52	  <unordered_set>, unordered_multiset	<ext/hash_set>, hash_multiset
    53	  <unordered_map>, unordered_map	<ext/hash_map>, hash_map
    54	  <unordered_map>, unordered_multimap	<ext/hash_map>, hash_multimap
    55	  <functional>, bind			<functional>, binder1st
    56	  <functional>, bind			<functional>, binder2nd
    57	  <functional>, bind			<functional>, bind1st
    58	  <functional>, bind			<functional>, bind2nd
    59	  <memory>, unique_ptr       		<memory>, auto_ptr
    60	*/
    61	
    62	#endif
    63	
    64	#endif