mingw/lib/gcc/mingw32/4.3.3/include/c++/ext/pb_ds/detail/cond_dealtor.hpp

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005, 2006 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 2, 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 // You should have received a copy of the GNU General Public License
  17 // along with this library; see the file COPYING.  If not, write to
  18 // the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
  19 // MA 02111-1307, USA.
  20
  21 // As a special exception, you may use this file as part of a free
  22 // software library without restriction.  Specifically, if other files
  23 // instantiate templates or use macros or inline functions from this
  24 // file, or you compile this file and link it with other files to
  25 // produce an executable, this file does not by itself cause the
  26 // resulting executable to be covered by the GNU General Public
  27 // License.  This exception does not however invalidate any other
  28 // reasons why the executable file might be covered by the GNU General
  29 // Public License.
  30
  31 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
  32
  33 // Permission to use, copy, modify, sell, and distribute this software
  34 // is hereby granted without fee, provided that the above copyright
  35 // notice appears in all copies, and that both that copyright notice
  36 // and this permission notice appear in supporting documentation. None
  37 // of the above authors, nor IBM Haifa Research Laboratories, make any
  38 // representation about the suitability of this software for any
  39 // purpose. It is provided "as is" without express or implied
  40 // warranty.
  41
  42 /**
  43  * @file cond_dealtor.hpp
  44  * Contains a conditional deallocator.
  45  */
  46
  47 #ifndef PB_DS_COND_DEALTOR_HPP
  48 #define PB_DS_COND_DEALTOR_HPP
  49
  50 namespace __gnu_pbds
  51 {
  52
  53   namespace detail
  54   {
  55
  56 #define PB_DS_COND_DEALTOR_CLASS_T_DEC          \
  57     template<typename Entry, class Allocator>
  58
  59 #define PB_DS_COND_DEALTOR_CLASS_C_DEC                          \
  60     cond_dealtor<                                               \
  61                                                 Entry,          \
  62                                                 Allocator>
  63
  64     template<typename Entry, class Allocator>
  65     class cond_dealtor
  66     {
  67     public:
  68       typedef
  69       typename Allocator::template rebind<Entry>::other
  70       entry_allocator;
  71
  72       typedef typename entry_allocator::pointer entry_pointer;
  73
  74     public:
  75       inline
  76       cond_dealtor(entry_pointer p_e);
  77
  78       inline
  79       ~cond_dealtor();
  80
  81       inline void
  82       set_no_action();
  83
  84     private:
  85       entry_pointer m_p_e;
  86
  87       bool m_no_action_destructor;
  88
  89       static entry_allocator s_alloc;
  90     };
  91
  92     PB_DS_COND_DEALTOR_CLASS_T_DEC
  93     typename PB_DS_COND_DEALTOR_CLASS_C_DEC::entry_allocator
  94     PB_DS_COND_DEALTOR_CLASS_C_DEC::s_alloc;
  95
  96     PB_DS_COND_DEALTOR_CLASS_T_DEC
  97     inline
  98     PB_DS_COND_DEALTOR_CLASS_C_DEC::
  99     cond_dealtor(entry_pointer p_e) :
 100       m_p_e(p_e),
 101       m_no_action_destructor(false)
 102     { }
 103
 104     PB_DS_COND_DEALTOR_CLASS_T_DEC
 105     inline void
 106     PB_DS_COND_DEALTOR_CLASS_C_DEC::
 107     set_no_action()
 108     {
 109       m_no_action_destructor = true;
 110     }
 111
 112     PB_DS_COND_DEALTOR_CLASS_T_DEC
 113     inline
 114     PB_DS_COND_DEALTOR_CLASS_C_DEC::
 115     ~cond_dealtor()
 116     {
 117       if (m_no_action_destructor)
 118         return;
 119
 120       s_alloc.deallocate(m_p_e, 1);
 121     }
 122
 123 #undef PB_DS_COND_DEALTOR_CLASS_T_DEC
 124 #undef PB_DS_COND_DEALTOR_CLASS_C_DEC
 125
 126   } // namespace detail
 127
 128 } // namespace __gnu_pbds
 129
 130 #endif // #ifndef PB_DS_COND_DEALTOR_HPP
 131