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The C and C++ Include Header Files

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

     1	// <cinttypes> -*- C++ -*-
     2	
     3	// Copyright (C) 2007-2025 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/cinttypes
    26	 *  This is a Standard C++ Library header.
    27	 */
    28	
    29	#ifndef _GLIBCXX_CINTTYPES
    30	#define _GLIBCXX_CINTTYPES 1
    31	
    32	#ifdef _GLIBCXX_SYSHDR
    33	#pragma GCC system_header
    34	#endif
    35	
    36	#if __cplusplus < 201103L
    37	# include <bits/c++0x_warning.h>
    38	#else
    39	
    40	#include <cstdint>
    41	
    42	// For 27.9.2/3 (see C99, Note 184)
    43	#if _GLIBCXX_HAVE_INTTYPES_H
    44	# ifndef __STDC_FORMAT_MACROS
    45	#  define _UNDEF__STDC_FORMAT_MACROS
    46	#  define __STDC_FORMAT_MACROS
    47	# endif
    48	# include <inttypes.h>
    49	# ifdef _UNDEF__STDC_FORMAT_MACROS
    50	#  undef __STDC_FORMAT_MACROS
    51	#  undef _UNDEF__STDC_FORMAT_MACROS
    52	# endif
    53	#endif
    54	
    55	#ifdef _GLIBCXX_USE_C99_INTTYPES
    56	
    57	namespace std
    58	{
    59	  // types
    60	  using ::imaxdiv_t;
    61	
    62	  // functions
    63	  using ::imaxabs;
    64	  using ::imaxdiv;
    65	
    66	  // GCC does not support extended integer types
    67	  // intmax_t abs(intmax_t)
    68	  // imaxdiv_t div(intmax_t, intmax_t)
    69	
    70	  using ::strtoimax;
    71	  using ::strtoumax;
    72	
    73	#if defined(_GLIBCXX_USE_WCHAR_T) && _GLIBCXX_USE_C99_INTTYPES_WCHAR_T
    74	  using ::wcstoimax;
    75	  using ::wcstoumax;
    76	#endif
    77	} // namespace std
    78	
    79	#endif // _GLIBCXX_USE_C99_INTTYPES
    80	
    81	#endif // C++11
    82	
    83	#endif // _GLIBCXX_CINTTYPES