libstdc++
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00001 // -*- C++ -*- 00002 00003 // Copyright (C) 2005, 2006, 2009, 2011 Free Software Foundation, Inc. 00004 // 00005 // This file is part of the GNU ISO C++ Library. This library is free 00006 // software; you can redistribute it and/or modify it under the terms 00007 // of the GNU General Public License as published by the Free Software 00008 // Foundation; either version 3, or (at your option) any later 00009 // version. 00010 00011 // This library is distributed in the hope that it will be useful, but 00012 // WITHOUT ANY WARRANTY; without even the implied warranty of 00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00014 // General Public License for more details. 00015 00016 // Under Section 7 of GPL version 3, you are granted additional 00017 // permissions described in the GCC Runtime Library Exception, version 00018 // 3.1, as published by the Free Software Foundation. 00019 00020 // You should have received a copy of the GNU General Public License and 00021 // a copy of the GCC Runtime Library Exception along with this program; 00022 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00023 // <http://www.gnu.org/licenses/>. 00024 00025 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. 00026 00027 // Permission to use, copy, modify, sell, and distribute this software 00028 // is hereby granted without fee, provided that the above copyright 00029 // notice appears in all copies, and that both that copyright notice 00030 // and this permission notice appear in supporting documentation. None 00031 // of the above authors, nor IBM Haifa Research Laboratories, make any 00032 // representation about the suitability of this software for any 00033 // purpose. It is provided "as is" without express or implied 00034 // warranty. 00035 00036 /** 00037 * @file cc_hash_table_map_/cond_key_dtor_entry_dealtor.hpp 00038 * Contains a conditional key destructor, used for exception handling. 00039 */ 00040 00041 namespace __gnu_pbds 00042 { 00043 namespace detail 00044 { 00045 /// Conditional dey destructor, cc_hash. 00046 template<typename HT_Map> 00047 class cond_dealtor 00048 { 00049 public: 00050 typedef typename HT_Map::entry entry; 00051 typedef typename HT_Map::entry_allocator entry_allocator; 00052 typedef typename HT_Map::key_type key_type; 00053 00054 cond_dealtor(entry_allocator* p_a, entry* p_e) 00055 : m_p_a(p_a), m_p_e(p_e), m_key_destruct(false), 00056 m_no_action_destructor(false) 00057 { } 00058 00059 inline 00060 ~cond_dealtor(); 00061 00062 void 00063 set_key_destruct() 00064 { m_key_destruct = true; } 00065 00066 void 00067 set_no_action_destructor() 00068 { m_no_action_destructor = true; } 00069 00070 protected: 00071 entry_allocator* const m_p_a; 00072 entry* const m_p_e; 00073 00074 bool m_key_destruct; 00075 bool m_no_action_destructor; 00076 }; 00077 00078 template<typename HT_Map> 00079 inline 00080 cond_dealtor<HT_Map>:: 00081 ~cond_dealtor() 00082 { 00083 if (m_no_action_destructor) 00084 return; 00085 if (m_key_destruct) 00086 m_p_e->m_value.first.~key_type(); 00087 m_p_a->deallocate(m_p_e, 1); 00088 } 00089 } // namespace detail 00090 } // namespace __gnu_pbds