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The C and C++ Include Header Files

cat -n /usr/include/c++/15/experimental/regex

     1	// <experimental/regex> -*- C++ -*-
     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 experimental/regex
    26	 *  This is a TS C++ Library header.
    27	 *  @ingroup libfund-ts
    28	 */
    29	
    30	#ifndef _GLIBCXX_EXPERIMENTAL_REGEX
    31	#define _GLIBCXX_EXPERIMENTAL_REGEX 1
    32	
    33	#ifdef _GLIBCXX_SYSHDR
    34	#pragma GCC system_header
    35	#endif
    36	
    37	#include <bits/requires_hosted.h> // experimental is currently omitted
    38	
    39	#if __cplusplus >= 201402L
    40	
    41	#include <regex>
    42	#include <experimental/string>
    43	
    44	namespace std _GLIBCXX_VISIBILITY(default)
    45	{
    46	_GLIBCXX_BEGIN_NAMESPACE_VERSION
    47	
    48	namespace experimental
    49	{
    50	inline namespace fundamentals_v2
    51	{
    52	#if _GLIBCXX_USE_CXX11_ABI
    53	namespace pmr
    54	{
    55	  template<typename _BidirectionalIterator>
    56	    using match_results
    57	      = std::match_results<_BidirectionalIterator, polymorphic_allocator<
    58				     sub_match<_BidirectionalIterator>>>;
    59	
    60	  typedef match_results<const char*> cmatch;
    61	  typedef match_results<const wchar_t*> wcmatch;
    62	  typedef match_results<string::const_iterator> smatch;
    63	  typedef match_results<wstring::const_iterator> wsmatch;
    64	
    65	} // namespace pmr
    66	#endif
    67	} // namespace fundamentals_v2
    68	} // namespace experimental
    69	_GLIBCXX_END_NAMESPACE_VERSION
    70	} // namespace std
    71	
    72	#endif // C++14
    73	
    74	#endif // _GLIBCXX_EXPERIMENTAL_REGEX