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The C and C++ Include Header Files

/usr/include/c++/11/regex

$ cat -n /usr/include/c++/11/regex

     1	// <regex> -*- C++ -*-
     2	
     3	// Copyright (C) 2007-2021 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/regex
    26	 *  This is a Standard C++ Library header.
    27	 */
    28	
    29	#ifndef _GLIBCXX_REGEX
    30	#define _GLIBCXX_REGEX 1
    31	
    32	#pragma GCC system_header
    33	
    34	#if __cplusplus < 201103L
    35	# include <bits/c++0x_warning.h>
    36	#else
    37	
    38	#include <algorithm>
    39	#include <bitset>
    40	#ifdef _GLIBCXX_DEBUG
    41	# include <iosfwd>
    42	#endif
    43	#include <iterator>
    44	#include <locale>
    45	#include <memory>
    46	#include <sstream>
    47	#include <stack>
    48	#include <stdexcept>
    49	#include <string>
    50	#include <utility>
    51	#include <vector>
    52	#include <map>
    53	#include <cstring>
    54	
    55	#include <ext/aligned_buffer.h>
    56	#include <ext/numeric_traits.h>
    57	#include <bits/std_function.h>
    58	#include <bits/regex_constants.h>
    59	#include <bits/regex_error.h>
    60	#include <bits/regex_automaton.h>
    61	#include <bits/regex_scanner.h>
    62	#include <bits/regex_compiler.h>
    63	#include <bits/regex.h>
    64	#include <bits/regex_executor.h>
    65	
    66	#if __cplusplus >= 201703L && _GLIBCXX_USE_CXX11_ABI
    67	namespace std _GLIBCXX_VISIBILITY(default)
    68	{
    69	_GLIBCXX_BEGIN_NAMESPACE_VERSION
    70	  namespace pmr
    71	  {
    72	    template<typename _Tp> class polymorphic_allocator;
    73	    template<typename _BidirectionalIterator>
    74	      using match_results
    75		= std::match_results<_BidirectionalIterator, polymorphic_allocator<
    76					sub_match<_BidirectionalIterator>>>;
    77	    using cmatch = match_results<const char*>;
    78	    // Use __normal_iterator directly, because pmr::string::const_iterator
    79	    // would require pmr::polymorphic_allocator to be complete.
    80	    using smatch
    81	      = match_results<__gnu_cxx::__normal_iterator<const char*, string>>;
    82	#ifdef _GLIBCXX_USE_WCHAR_T
    83	    using wcmatch = match_results<const wchar_t*>;
    84	    using wsmatch
    85	      = match_results<__gnu_cxx::__normal_iterator<const wchar_t*, wstring>>;
    86	#endif
    87	  } // namespace pmr
    88	_GLIBCXX_END_NAMESPACE_VERSION
    89	} // namespace std
    90	#endif // C++17
    91	#endif // C++11
    92	
    93	#endif // _GLIBCXX_REGEX
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