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The C and C++ Include Header Files

cat -n /usr/include/c++/15/tr1/cwchar

     1	// TR1 cwchar -*- C++ -*-
     2	
     3	// Copyright (C) 2006-2025 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 tr1/cwchar
    26	 *  This is a TR1 C++ Library header. 
    27	 */
    28	
    29	#ifndef _GLIBCXX_TR1_CWCHAR
    30	#define _GLIBCXX_TR1_CWCHAR 1
    31	
    32	#ifdef _GLIBCXX_SYSHDR
    33	#pragma GCC system_header
    34	#endif
    35	
    36	#include <bits/requires_hosted.h> // TR1
    37	
    38	#include <cwchar>
    39	
    40	#ifdef _GLIBCXX_USE_WCHAR_T
    41	
    42	namespace std _GLIBCXX_VISIBILITY(default)
    43	{
    44	_GLIBCXX_BEGIN_NAMESPACE_VERSION
    45	
    46	namespace tr1
    47	{
    48	#if _GLIBCXX_HAVE_WCSTOF
    49	  using std::wcstof;
    50	#endif
    51	#if _GLIBCXX_HAVE_VFWSCANF
    52	  using std::vfwscanf;
    53	#endif
    54	#if _GLIBCXX_HAVE_VSWSCANF
    55	  using std::vswscanf;
    56	#endif
    57	#if _GLIBCXX_HAVE_VWSCANF
    58	  using std::vwscanf;
    59	#endif
    60	
    61	#if _GLIBCXX_USE_C99_WCHAR
    62	  using std::wcstold;
    63	  using std::wcstoll;
    64	  using std::wcstoull;
    65	#endif
    66	}
    67	
    68	_GLIBCXX_END_NAMESPACE_VERSION
    69	}
    70	
    71	#endif // _GLIBCXX_USE_WCHAR_T
    72	
    73	#endif // _GLIBCXX_TR1_CWCHAR