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      1 // -*- C++ -*-
      2 
      3 // Copyright (C) 2005, 2006, 2009, 2011 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 cc_hash_table_map_/cond_key_dtor_entry_dealtor.hpp
     38  * Contains a conditional key destructor, used for exception handling.
     39  */
     40 
     41 namespace __gnu_pbds
     42 {
     43   namespace detail
     44   {
     45     /// Conditional dey destructor, cc_hash.
     46     template<typename HT_Map>
     47     class cond_dealtor
     48     {
     49     public:
     50       typedef typename HT_Map::entry 		entry;
     51       typedef typename HT_Map::entry_allocator 	entry_allocator;
     52       typedef typename HT_Map::key_type 	key_type;
     53 
     54       cond_dealtor(entry_allocator* p_a, entry* p_e)
     55       : m_p_a(p_a), m_p_e(p_e), m_key_destruct(false),
     56 	m_no_action_destructor(false)
     57       { }
     58 
     59       inline
     60       ~cond_dealtor();
     61 
     62       void
     63       set_key_destruct()
     64       { m_key_destruct = true; }
     65 
     66       void
     67       set_no_action_destructor()
     68       { m_no_action_destructor = true; }
     69 
     70     protected:
     71       entry_allocator* const 			m_p_a;
     72       entry* const 				m_p_e;
     73 
     74       bool 					m_key_destruct;
     75       bool 					m_no_action_destructor;
     76     };
     77 
     78     template<typename HT_Map>
     79     inline
     80     cond_dealtor<HT_Map>::
     81     ~cond_dealtor()
     82     {
     83       if (m_no_action_destructor)
     84 	return;
     85       if (m_key_destruct)
     86 	m_p_e->m_value.first.~key_type();
     87       m_p_a->deallocate(m_p_e, 1);
     88     }
     89   } // namespace detail
     90 } // namespace __gnu_pbds
     91