# 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