cond_dealtor.hpp

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00001 // -*- C++ -*-
00002 
00003 // Copyright (C) 2005, 2006, 2009 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 cond_dealtor.hpp
00038  * Contains a conditional deallocator.
00039  */
00040 
00041 #ifndef PB_DS_COND_DEALTOR_HPP
00042 #define PB_DS_COND_DEALTOR_HPP
00043 
00044 namespace __gnu_pbds
00045 {
00046 
00047   namespace detail
00048   {
00049 
00050 #define PB_DS_COND_DEALTOR_CLASS_T_DEC      \
00051     template<typename Entry, class Allocator>
00052 
00053 #define PB_DS_COND_DEALTOR_CLASS_C_DEC              \
00054     cond_dealtor<                       \
00055                         Entry,      \
00056                         Allocator>
00057 
00058     template<typename Entry, class Allocator>
00059     class cond_dealtor
00060     {
00061     public:
00062       typedef
00063       typename Allocator::template rebind<Entry>::other
00064       entry_allocator;
00065 
00066       typedef typename entry_allocator::pointer entry_pointer;
00067 
00068     public:
00069       inline
00070       cond_dealtor(entry_pointer p_e);
00071 
00072       inline
00073       ~cond_dealtor();
00074 
00075       inline void
00076       set_no_action();
00077 
00078     private:
00079       entry_pointer m_p_e;
00080 
00081       bool m_no_action_destructor;
00082 
00083       static entry_allocator s_alloc;
00084     };
00085 
00086     PB_DS_COND_DEALTOR_CLASS_T_DEC
00087     typename PB_DS_COND_DEALTOR_CLASS_C_DEC::entry_allocator
00088     PB_DS_COND_DEALTOR_CLASS_C_DEC::s_alloc;
00089 
00090     PB_DS_COND_DEALTOR_CLASS_T_DEC
00091     inline
00092     PB_DS_COND_DEALTOR_CLASS_C_DEC::
00093     cond_dealtor(entry_pointer p_e) :
00094       m_p_e(p_e),
00095       m_no_action_destructor(false)
00096     { }
00097 
00098     PB_DS_COND_DEALTOR_CLASS_T_DEC
00099     inline void
00100     PB_DS_COND_DEALTOR_CLASS_C_DEC::
00101     set_no_action()
00102     {
00103       m_no_action_destructor = true;
00104     }
00105 
00106     PB_DS_COND_DEALTOR_CLASS_T_DEC
00107     inline
00108     PB_DS_COND_DEALTOR_CLASS_C_DEC::
00109     ~cond_dealtor()
00110     {
00111       if (m_no_action_destructor)
00112         return;
00113 
00114       s_alloc.deallocate(m_p_e, 1);
00115     }
00116 
00117 #undef PB_DS_COND_DEALTOR_CLASS_T_DEC
00118 #undef PB_DS_COND_DEALTOR_CLASS_C_DEC
00119 
00120   } // namespace detail
00121 
00122 } // namespace __gnu_pbds
00123 
00124 #endif // #ifndef PB_DS_COND_DEALTOR_HPP
00125 

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