1 // -*- C++ -*- 2 3 // Copyright (C) 2005-2018 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 namespace __gnu_pbds 45 { 46 namespace detail 47 { 48 /// Conditional deallocate constructor argument. 49 template<typename Entry, typename _Alloc> 50 class cond_dealtor 51 { 52 typedef typename _Alloc::template rebind<Entry> __rebind_e; 53 54 public: 55 typedef typename __rebind_e::other entry_allocator; 56 typedef typename entry_allocator::pointer entry_pointer; 57 58 cond_dealtor(entry_pointer p_e) 59 : m_p_e(p_e), m_no_action_destructor(false) { } 60 61 ~cond_dealtor() 62 { 63 if (m_no_action_destructor) 64 return; 65 s_alloc.deallocate(m_p_e, 1); 66 } 67 68 void 69 set_no_action() 70 { m_no_action_destructor = true; } 71 72 private: 73 entry_pointer m_p_e; 74 bool m_no_action_destructor; 75 static entry_allocator s_alloc; 76 }; 77 78 template<typename Entry, class _Alloc> 79 typename cond_dealtor<Entry, _Alloc>::entry_allocator 80 cond_dealtor<Entry, _Alloc>::s_alloc; 81 } // namespace detail 82 } // namespace __gnu_pbds 83 84 #endif // #ifndef PB_DS_COND_DEALTOR_HPP 85