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The C and C++ Include Header Files

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

     1	// -*- C++ -*- forwarding header.
     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/cwctype
    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 wctype.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: <cwctype>
    37	//
    38	
    39	#ifndef _GLIBCXX_CWCTYPE
    40	#define _GLIBCXX_CWCTYPE 1
    41	
    42	#ifdef _GLIBCXX_SYSHDR
    43	#pragma GCC system_header
    44	#endif
    45	
    46	#include <bits/c++config.h>
    47	
    48	#if _GLIBCXX_HAVE_WCTYPE_H
    49	
    50	#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 10
    51	// Work around glibc BZ 9694
    52	#include <stddef.h>
    53	#endif
    54	
    55	#include <wctype.h>
    56	#endif // _GLIBCXX_HAVE_WCTYPE_H
    57	
    58	// Get rid of those macros defined in <wctype.h> in lieu of real functions.
    59	#undef iswalnum
    60	#undef iswalpha
    61	#if _GLIBCXX_HAVE_ISWBLANK
    62	# undef iswblank
    63	#endif
    64	#undef iswcntrl
    65	#undef iswctype
    66	#undef iswdigit
    67	#undef iswgraph
    68	#undef iswlower
    69	#undef iswprint
    70	#undef iswpunct
    71	#undef iswspace
    72	#undef iswupper
    73	#undef iswxdigit
    74	#undef towctrans
    75	#undef towlower
    76	#undef towupper
    77	#undef wctrans
    78	#undef wctype
    79	
    80	#if _GLIBCXX_USE_WCHAR_T
    81	
    82	namespace std
    83	{
    84	  using ::wctrans_t;
    85	  using ::wctype_t;
    86	  using ::wint_t;
    87	
    88	  using ::iswalnum;
    89	  using ::iswalpha;
    90	#if _GLIBCXX_HAVE_ISWBLANK
    91	  using ::iswblank;
    92	#endif
    93	  using ::iswcntrl;
    94	  using ::iswctype;
    95	  using ::iswdigit;
    96	  using ::iswgraph;
    97	  using ::iswlower;
    98	  using ::iswprint;
    99	  using ::iswpunct;
   100	  using ::iswspace;
   101	  using ::iswupper;
   102	  using ::iswxdigit;
   103	  using ::towctrans;
   104	  using ::towlower;
   105	  using ::towupper;
   106	  using ::wctrans;
   107	  using ::wctype;
   108	} // namespace
   109	
   110	#endif //_GLIBCXX_USE_WCHAR_T
   111	
   112	#endif // _GLIBCXX_CWCTYPE