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The C and C++ Include Header Files

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

     1	// <cstdint> -*- 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/cstdint
    26	 *  This is a Standard C++ Library header.
    27	 */
    28	
    29	#ifndef _GLIBCXX_CSTDINT
    30	#define _GLIBCXX_CSTDINT 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 <bits/c++config.h>
    41	
    42	#if ! _GLIBCXX_HOSTED && __has_include(<stdint-gcc.h>)
    43	// For --disable-hosted-libstdcxx we want GCC's own stdint-gcc.h header
    44	// even when -ffreestanding isn't used.
    45	# include <stdint-gcc.h>
    46	#elif __has_include(<stdint.h>)
    47	# include <stdint.h>
    48	#endif
    49	
    50	namespace std
    51	{
    52	#ifdef _GLIBCXX_USE_C99_STDINT
    53	  using ::int8_t;
    54	  using ::int16_t;
    55	  using ::int32_t;
    56	  using ::int64_t;
    57	
    58	  using ::int_fast8_t;
    59	  using ::int_fast16_t;
    60	  using ::int_fast32_t;
    61	  using ::int_fast64_t;
    62	
    63	  using ::int_least8_t;
    64	  using ::int_least16_t;
    65	  using ::int_least32_t;
    66	  using ::int_least64_t;
    67	
    68	  using ::intmax_t;
    69	  using ::intptr_t;
    70	  
    71	  using ::uint8_t;
    72	  using ::uint16_t;
    73	  using ::uint32_t;
    74	  using ::uint64_t;
    75	
    76	  using ::uint_fast8_t;
    77	  using ::uint_fast16_t;
    78	  using ::uint_fast32_t;
    79	  using ::uint_fast64_t;
    80	
    81	  using ::uint_least8_t;
    82	  using ::uint_least16_t;
    83	  using ::uint_least32_t;
    84	  using ::uint_least64_t;
    85	
    86	  using ::uintmax_t;
    87	  using ::uintptr_t;
    88	#else // !_GLIBCXX_USE_C99_STDINT
    89	
    90	  using intmax_t = __INTMAX_TYPE__;
    91	  using uintmax_t = __UINTMAX_TYPE__;
    92	
    93	#ifdef __INT8_TYPE__
    94	  using int8_t = __INT8_TYPE__;
    95	#endif
    96	#ifdef __INT16_TYPE__
    97	  using int16_t = __INT16_TYPE__;
    98	#endif
    99	#ifdef __INT32_TYPE__
   100	  using int32_t = __INT32_TYPE__;
   101	#endif
   102	#ifdef __INT64_TYPE__
   103	  using int64_t = __INT64_TYPE__;
   104	#endif
   105	
   106	  using int_least8_t = __INT_LEAST8_TYPE__;
   107	  using int_least16_t = __INT_LEAST16_TYPE__;
   108	  using int_least32_t = __INT_LEAST32_TYPE__;
   109	  using int_least64_t = __INT_LEAST64_TYPE__;
   110	  using int_fast8_t = __INT_FAST8_TYPE__;
   111	  using int_fast16_t = __INT_FAST16_TYPE__;
   112	  using int_fast32_t = __INT_FAST32_TYPE__;
   113	  using int_fast64_t = __INT_FAST64_TYPE__;
   114	
   115	#ifdef __INTPTR_TYPE__
   116	  using intptr_t = __INTPTR_TYPE__;
   117	#endif
   118	
   119	#ifdef __UINT8_TYPE__
   120	  using uint8_t = __UINT8_TYPE__;
   121	#endif
   122	#ifdef __UINT16_TYPE__
   123	  using uint16_t = __UINT16_TYPE__;
   124	#endif
   125	#ifdef __UINT32_TYPE__
   126	  using uint32_t = __UINT32_TYPE__;
   127	#endif
   128	#ifdef __UINT64_TYPE__
   129	  using uint64_t = __UINT64_TYPE__;
   130	#endif
   131	  using uint_least8_t = __UINT_LEAST8_TYPE__;
   132	  using uint_least16_t = __UINT_LEAST16_TYPE__;
   133	  using uint_least32_t = __UINT_LEAST32_TYPE__;
   134	  using uint_least64_t = __UINT_LEAST64_TYPE__;
   135	  using uint_fast8_t = __UINT_FAST8_TYPE__;
   136	  using uint_fast16_t = __UINT_FAST16_TYPE__;
   137	  using uint_fast32_t = __UINT_FAST32_TYPE__;
   138	  using uint_fast64_t = __UINT_FAST64_TYPE__;
   139	#ifdef __UINTPTR_TYPE__
   140	  using uintptr_t = __UINTPTR_TYPE__;
   141	#endif
   142	
   143	#endif // _GLIBCXX_USE_C99_STDINT
   144	} // namespace std
   145	
   146	#endif // C++11
   147	
   148	#endif // _GLIBCXX_CSTDINT