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The C and C++ Include Header Files

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

     1	// -*- C++ -*- forwarding header.
     2	
     3	// Copyright (C) 2015-2025 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/cuchar
    26	 *  This is a Standard C++ Library file.  You should @c \#include this file
    27	 *  in your programs, rather than any of the @a *.h implementation files.
    28	 *
    29	 *  This is the C++ version of the Standard C Library header @c uchar.h,
    30	 *  and its contents are (mostly) the same as that header, but are all
    31	 *  contained in the namespace @c std (except for names which are defined
    32	 *  as macros in C).
    33	 */
    34	
    35	//
    36	// ISO C++ 14882:2011 21.8
    37	//
    38	
    39	#ifndef _GLIBCXX_CUCHAR
    40	#define _GLIBCXX_CUCHAR 1
    41	
    42	#ifdef _GLIBCXX_SYSHDR
    43	#pragma GCC system_header
    44	#endif
    45	
    46	#if __cplusplus < 201103L
    47	# include <bits/c++0x_warning.h>
    48	#else
    49	
    50	#include <bits/c++config.h>
    51	#include <cwchar>
    52	
    53	#if (_GLIBCXX_USE_C11_UCHAR_CXX11 \
    54	     || (_GLIBCXX_USE_CHAR8_T \
    55		 && (_GLIBCXX_USE_UCHAR_C8RTOMB_MBRTOC8_FCHAR8_T \
    56		     || (__cplusplus >= 202002 \
    57			 && _GLIBCXX_USE_UCHAR_C8RTOMB_MBRTOC8_CXX20))))
    58	
    59	#include <uchar.h>
    60	
    61	#endif
    62	
    63	
    64	// Support for mbrtoc8 and c8rtomb is conditioned on support by the C library.
    65	#if (_GLIBCXX_USE_CHAR8_T \
    66	     && (_GLIBCXX_USE_UCHAR_C8RTOMB_MBRTOC8_FCHAR8_T \
    67		 || (__cplusplus >= 202002 \
    68		     && _GLIBCXX_USE_UCHAR_C8RTOMB_MBRTOC8_CXX20)))
    69	
    70	#undef mbrtoc8
    71	#undef c8rtomb
    72	
    73	namespace std _GLIBCXX_VISIBILITY(default)
    74	{
    75	_GLIBCXX_BEGIN_NAMESPACE_VERSION
    76	
    77	  using ::mbrtoc8;
    78	  using ::c8rtomb;
    79	
    80	_GLIBCXX_END_NAMESPACE_VERSION
    81	} // namespace std
    82	
    83	#endif // _GLIBCXX_USE_CHAR8_T
    84	
    85	
    86	#if _GLIBCXX_USE_C11_UCHAR_CXX11
    87	
    88	// Get rid of those macros defined in <uchar.h> in lieu of real functions.
    89	#undef mbrtoc16
    90	#undef c16rtomb
    91	#undef mbrtoc32
    92	#undef c32rtomb
    93	
    94	namespace std _GLIBCXX_VISIBILITY(default)
    95	{
    96	_GLIBCXX_BEGIN_NAMESPACE_VERSION
    97	
    98	  using ::mbrtoc16;
    99	  using ::c16rtomb;
   100	  using ::mbrtoc32;
   101	  using ::c32rtomb;
   102	
   103	_GLIBCXX_END_NAMESPACE_VERSION
   104	} // namespace std
   105	
   106	#endif // _GLIBCXX_USE_C11_UCHAR_CXX11
   107	
   108	#endif // C++11
   109	
   110	#endif // _GLIBCXX_CUCHAR