# cond_dealtor.hpp

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    00001 // -*- C++ -*-
    00002
    00003 // Copyright (C) 2005, 2006 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 2, 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 // You should have received a copy of the GNU General Public License
    00017 // along with this library; see the file COPYING.  If not, write to
    00018 // the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
    00019 // MA 02111-1307, USA.
    00020
    00021 // As a special exception, you may use this file as part of a free
    00022 // software library without restriction.  Specifically, if other files
    00023 // instantiate templates or use macros or inline functions from this
    00024 // file, or you compile this file and link it with other files to
    00025 // produce an executable, this file does not by itself cause the
    00026 // resulting executable to be covered by the GNU General Public
    00027 // License.  This exception does not however invalidate any other
    00028 // reasons why the executable file might be covered by the GNU General
    00029 // Public License.
    00030
    00031 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
    00032
    00033 // Permission to use, copy, modify, sell, and distribute this software
    00034 // is hereby granted without fee, provided that the above copyright
    00035 // notice appears in all copies, and that both that copyright notice
    00036 // and this permission notice appear in supporting documentation. None
    00037 // of the above authors, nor IBM Haifa Research Laboratories, make any
    00038 // representation about the suitability of this software for any
    00039 // purpose. It is provided "as is" without express or implied
    00040 // warranty.
    00041
    00042 /**
    00043  * @file cond_dealtor.hpp
    00044  * Contains a conditional deallocator.
    00045  */
    00046
    00047 #ifndef PB_DS_COND_DEALTOR_HPP
    00048 #define PB_DS_COND_DEALTOR_HPP
    00049
    00050 namespace __gnu_pbds
    00051 {
    00052
    00053   namespace detail
    00054   {
    00055
    00056 #define PB_DS_COND_DEALTOR_CLASS_T_DEC      \
    00057     template<typename Entry, class Allocator>
    00058
    00059 #define PB_DS_COND_DEALTOR_CLASS_C_DEC              \
    00060     cond_dealtor<                       \
    00061                         Entry,      \
    00062                         Allocator>
    00063
    00064     template<typename Entry, class Allocator>
    00065     class cond_dealtor
    00066     {
    00067     public:
    00068       typedef
    00069       typename Allocator::template rebind<Entry>::other
    00070       entry_allocator;
    00071
    00072       typedef typename entry_allocator::pointer entry_pointer;
    00073
    00074     public:
    00075       inline
    00076       cond_dealtor(entry_pointer p_e);
    00077
    00078       inline
    00079       ~cond_dealtor();
    00080
    00081       inline void
    00082       set_no_action();
    00083
    00084     private:
    00085       entry_pointer m_p_e;
    00086
    00087       bool m_no_action_destructor;
    00088
    00089       static entry_allocator s_alloc;
    00090     };
    00091
    00092     PB_DS_COND_DEALTOR_CLASS_T_DEC
    00093     typename PB_DS_COND_DEALTOR_CLASS_C_DEC::entry_allocator
    00094     PB_DS_COND_DEALTOR_CLASS_C_DEC::s_alloc;
    00095
    00096     PB_DS_COND_DEALTOR_CLASS_T_DEC
    00097     inline
    00098     PB_DS_COND_DEALTOR_CLASS_C_DEC::
    00099     cond_dealtor(entry_pointer p_e) :
    00100       m_p_e(p_e),
    00101       m_no_action_destructor(false)
    00102     { }
    00103
    00104     PB_DS_COND_DEALTOR_CLASS_T_DEC
    00105     inline void
    00106     PB_DS_COND_DEALTOR_CLASS_C_DEC::
    00107     set_no_action()
    00108     {
    00109       m_no_action_destructor = true;
    00110     }
    00111
    00112     PB_DS_COND_DEALTOR_CLASS_T_DEC
    00113     inline
    00114     PB_DS_COND_DEALTOR_CLASS_C_DEC::
    00115     ~cond_dealtor()
    00116     {
    00117       if (m_no_action_destructor)
    00118         return;
    00119
    00120       s_alloc.deallocate(m_p_e, 1);
    00121     }
    00122
    00123 #undef PB_DS_COND_DEALTOR_CLASS_T_DEC
    00124 #undef PB_DS_COND_DEALTOR_CLASS_C_DEC
    00125
    00126   } // namespace detail
    00127
    00128 } // namespace __gnu_pbds
    00129
    00130 #endif // #ifndef PB_DS_COND_DEALTOR_HPP
    00131