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The C and C++ Include Header Files

/usr/include/c++/11/string


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

     1	// Components for manipulating sequences of characters -*- C++ -*-
     2	
     3	// Copyright (C) 1997-2021 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/string
    26	 *  This is a Standard C++ Library header.
    27	 */
    28	
    29	//
    30	// ISO C++ 14882: 21  Strings library
    31	//
    32	
    33	#ifndef _GLIBCXX_STRING
    34	#define _GLIBCXX_STRING	1
    35	
    36	#pragma GCC system_header
    37	
    38	#include <bits/c++config.h>
    39	#include <bits/stringfwd.h>
    40	#include <bits/char_traits.h>  // NB: In turn includes stl_algobase.h
    41	#include <bits/allocator.h>
    42	#include <bits/cpp_type_traits.h>
    43	#include <bits/localefwd.h>    // For operators >>, <<, and getline.
    44	#include <bits/ostream_insert.h>
    45	#include <bits/stl_iterator_base_types.h>
    46	#include <bits/stl_iterator_base_funcs.h>
    47	#include <bits/stl_iterator.h>
    48	#include <bits/stl_function.h> // For less
    49	#include <ext/numeric_traits.h>
    50	#include <bits/stl_algobase.h>
    51	#if __cplusplus > 201703L
    52	#  include <bits/stl_algo.h> // For remove and remove_if
    53	#endif // C++20
    54	#include <bits/range_access.h>
    55	#include <bits/basic_string.h>
    56	#include <bits/basic_string.tcc>
    57	
    58	#if __cplusplus >= 201703L && _GLIBCXX_USE_CXX11_ABI
    59	namespace std _GLIBCXX_VISIBILITY(default)
    60	{
    61	_GLIBCXX_BEGIN_NAMESPACE_VERSION
    62	  namespace pmr {
    63	    template<typename _Tp> class polymorphic_allocator;
    64	    template<typename _CharT, typename _Traits = char_traits<_CharT>>
    65	      using basic_string = std::basic_string<_CharT, _Traits,
    66						     polymorphic_allocator<_CharT>>;
    67	    using string    = basic_string<char>;
    68	#ifdef _GLIBCXX_USE_CHAR8_T
    69	    using u8string  = basic_string<char8_t>;
    70	#endif
    71	    using u16string = basic_string<char16_t>;
    72	    using u32string = basic_string<char32_t>;
    73	#ifdef _GLIBCXX_USE_WCHAR_T
    74	    using wstring   = basic_string<wchar_t>;
    75	#endif
    76	  } // namespace pmr
    77	
    78	  template<typename _Str>
    79	    struct __hash_string_base
    80	    : public __hash_base<size_t, _Str>
    81	    {
    82	      size_t
    83	      operator()(const _Str& __s) const noexcept
    84	      { return hash<basic_string_view<typename _Str::value_type>>{}(__s); }
    85	    };
    86	
    87	  template<>
    88	    struct hash<pmr::string>
    89	    : public __hash_string_base<pmr::string>
    90	    { };
    91	#ifdef _GLIBCXX_USE_CHAR8_T
    92	  template<>
    93	    struct hash<pmr::u8string>
    94	    : public __hash_string_base<pmr::u8string>
    95	    { };
    96	#endif
    97	  template<>
    98	    struct hash<pmr::u16string>
    99	    : public __hash_string_base<pmr::u16string>
   100	    { };
   101	  template<>
   102	    struct hash<pmr::u32string>
   103	    : public __hash_string_base<pmr::u32string>
   104	    { };
   105	#ifdef _GLIBCXX_USE_WCHAR_T
   106	  template<>
   107	    struct hash<pmr::wstring>
   108	    : public __hash_string_base<pmr::wstring>
   109	    { };
   110	#endif
   111	
   112	_GLIBCXX_END_NAMESPACE_VERSION
   113	} // namespace std
   114	#endif // C++17
   115	
   116	#if __cplusplus > 201703L
   117	namespace std _GLIBCXX_VISIBILITY(default)
   118	{
   119	_GLIBCXX_BEGIN_NAMESPACE_VERSION
   120	
   121	#define __cpp_lib_erase_if 202002L
   122	
   123	  template<typename _CharT, typename _Traits, typename _Alloc,
   124		   typename _Predicate>
   125	    inline typename basic_string<_CharT, _Traits, _Alloc>::size_type
   126	    erase_if(basic_string<_CharT, _Traits, _Alloc>& __cont, _Predicate __pred)
   127	    {
   128	      const auto __osz = __cont.size();
   129	      __cont.erase(std::remove_if(__cont.begin(), __cont.end(), __pred),
   130			   __cont.end());
   131	      return __osz - __cont.size();
   132	    }
   133	
   134	  template<typename _CharT, typename _Traits, typename _Alloc, typename _Up>
   135	    inline typename basic_string<_CharT, _Traits, _Alloc>::size_type
   136	    erase(basic_string<_CharT, _Traits, _Alloc>& __cont, const _Up& __value)
   137	    {
   138	      const auto __osz = __cont.size();
   139	      __cont.erase(std::remove(__cont.begin(), __cont.end(), __value),
   140			   __cont.end());
   141	      return __osz - __cont.size();
   142	    }
   143	_GLIBCXX_END_NAMESPACE_VERSION
   144	} // namespace std
   145	#endif // C++20
   146	
   147	#endif /* _GLIBCXX_STRING */