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The C and C++ Include Header Files

cat -n /usr/include/c++/15/bits/erase_if.h

     1	// <bits/erase_if.h> -*- 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 bits/erase_if.h
    26	 *  This is an internal header file, included by other library headers.
    27	 *  Do not attempt to use it directly.
    28	 */
    29	
    30	#ifndef _GLIBCXX_ERASE_IF_H
    31	#define _GLIBCXX_ERASE_IF_H 1
    32	
    33	#ifdef _GLIBCXX_SYSHDR
    34	#pragma GCC system_header
    35	#endif
    36	
    37	#include <bits/c++config.h>
    38	
    39	// Used by C++17 containers and Library Fundamentals v2 headers.
    40	#if __cplusplus >= 201402L
    41	namespace std
    42	{
    43	_GLIBCXX_BEGIN_NAMESPACE_VERSION
    44	
    45	  namespace __detail
    46	  {
    47	    template<typename _Container, typename _UnsafeContainer,
    48		     typename _Predicate>
    49	      typename _Container::size_type
    50	      __erase_nodes_if(_Container& __cont, _UnsafeContainer& __ucont,
    51			       _Predicate __pred)
    52	      {
    53		typename _Container::size_type __num = 0;
    54		for (auto __iter = __ucont.begin(), __last = __ucont.end();
    55		     __iter != __last;)
    56		  {
    57		    if (__pred(*__iter))
    58		      {
    59			__iter = __cont.erase(__iter);
    60			++__num;
    61		      }
    62		    else
    63		      ++__iter;
    64		  }
    65		return __num;
    66	      }
    67	  } // namespace __detail
    68	
    69	_GLIBCXX_END_NAMESPACE_VERSION
    70	} // namespace std
    71	#endif // C++14
    72	
    73	#endif // _GLIBCXX_ERASE_IF_H