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The C and C++ Include Header Files

/usr/include/c++/13/ext/pb_ds/detail/cond_dealtor.hpp


$ cat -n /usr/include/c++/13/ext/pb_ds/detail/cond_dealtor.hpp

     1	// -*- C++ -*-
     2	
     3	// Copyright (C) 2005-2023 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 terms
     7	// of the GNU General Public License as published by the Free Software
     8	// Foundation; either version 3, or (at your option) any later
     9	// version.
    10	
    11	// This library is distributed in the hope that it will be useful, but
    12	// WITHOUT ANY WARRANTY; without even the implied warranty of
    13	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    14	// 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	// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
    26	
    27	// Permission to use, copy, modify, sell, and distribute this software
    28	// is hereby granted without fee, provided that the above copyright
    29	// notice appears in all copies, and that both that copyright notice
    30	// and this permission notice appear in supporting documentation. None
    31	// of the above authors, nor IBM Haifa Research Laboratories, make any
    32	// representation about the suitability of this software for any
    33	// purpose. It is provided "as is" without express or implied
    34	// warranty.
    35	
    36	/**
    37	 * @file detail/cond_dealtor.hpp
    38	 * Contains a conditional deallocator.
    39	 */
    40	
    41	#ifndef PB_DS_COND_DEALTOR_HPP
    42	#define PB_DS_COND_DEALTOR_HPP
    43	
    44	#include <ext/pb_ds/detail/types_traits.hpp>
    45	
    46	namespace __gnu_pbds
    47	{
    48	  namespace detail
    49	  {
    50	    /// Conditional deallocate constructor argument.
    51	    template<typename Entry, typename _Alloc>
    52	      class cond_dealtor
    53	      {
    54		typedef rebind_traits<_Alloc, Entry>	alloc_traits;
    55	
    56	      public:
    57		typedef typename alloc_traits::allocator_type entry_allocator;
    58		typedef typename alloc_traits::pointer	      entry_pointer;
    59	
    60		cond_dealtor(entry_pointer p_e)
    61		: m_p_e(p_e), m_no_action_destructor(false) { }
    62	
    63		~cond_dealtor()
    64		{
    65		  if (m_no_action_destructor)
    66		    return;
    67		  s_alloc.deallocate(m_p_e, 1);
    68		}
    69	
    70		void
    71		set_no_action()
    72		{ m_no_action_destructor = true; }
    73	
    74	      private:
    75		entry_pointer 		m_p_e;
    76		bool 			m_no_action_destructor;
    77		static entry_allocator 	s_alloc;
    78	      };
    79	
    80	    template<typename Entry, class _Alloc>
    81	      typename cond_dealtor<Entry, _Alloc>::entry_allocator
    82	      cond_dealtor<Entry, _Alloc>::s_alloc;
    83	  } // namespace detail
    84	} // namespace __gnu_pbds
    85	
    86	#endif // #ifndef PB_DS_COND_DEALTOR_HPP