gomp-20050608-branch/libstdc++-v3/include/ext/pb_assoc/detail/cond_dealtor.hpp

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005 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
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 2, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  19 // USA.
  20
  21 // As a special exception, you may use this file as part of a free software
  22 // library without restriction.  Specifically, if other files instantiate
  23 // templates or use macros or inline functions from this file, or you compile
  24 // this file and link it with other files to produce an executable, this
  25 // file does not by itself cause the resulting executable to be covered by
  26 // the GNU General Public License.  This exception does not however
  27 // invalidate any other reasons why the executable file might be covered by
  28 // the GNU General Public License.
  29
  30 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
  31
  32 // Permission to use, copy, modify, sell, and distribute this software
  33 // is hereby granted without fee, provided that the above copyright
  34 // notice appears in all copies, and that both that copyright notice and
  35 // this permission notice appear in supporting documentation. None of
  36 // the above authors, nor IBM Haifa Research Laboratories, make any
  37 // representation about the suitability of this software for any
  38 // purpose. It is provided "as is" without express or implied warranty.
  39
  40 /**
  41  * @file cond_dealtor.hpp
  42  * Contains a conditional deallocator.
  43  */
  44
  45 #ifndef COND_DEALTOR_HPP
  46 #define COND_DEALTOR_HPP
  47
  48 namespace pb_assoc
  49 {
  50
  51   namespace detail
  52   {
  53
  54 #define PB_ASSOC_COND_DEALTOR_CLASS_T_DEC \
  55         template<class Entry, class Allocator>
  56
  57 #define PB_ASSOC_COND_DEALTOR_CLASS_C_DEC \
  58         cond_dealtor< \
  59                 Entry, \
  60                 Allocator>
  61
  62     template<class Entry, class Allocator>
  63     class cond_dealtor
  64     {
  65     public:
  66       typedef
  67       typename Allocator::template rebind<Entry>::other
  68       entry_allocator;
  69
  70       typedef typename entry_allocator::pointer entry_pointer;
  71
  72     public:
  73       inline
  74       cond_dealtor(entry_pointer p_e);
  75
  76       inline
  77       ~cond_dealtor();
  78
  79       inline void
  80       set_no_action();
  81
  82     private:
  83       entry_pointer m_p_e;
  84
  85       bool m_no_action_destructor;
  86
  87       static entry_allocator s_alloc;
  88     };
  89
  90     PB_ASSOC_COND_DEALTOR_CLASS_T_DEC
  91     typename PB_ASSOC_COND_DEALTOR_CLASS_C_DEC::entry_allocator
  92     PB_ASSOC_COND_DEALTOR_CLASS_C_DEC::s_alloc;
  93
  94     PB_ASSOC_COND_DEALTOR_CLASS_T_DEC
  95     inline
  96     PB_ASSOC_COND_DEALTOR_CLASS_C_DEC::
  97     cond_dealtor(entry_pointer p_e) :
  98       m_p_e(p_e),
  99       m_no_action_destructor(false)
 100     { }
 101
 102     PB_ASSOC_COND_DEALTOR_CLASS_T_DEC
 103     inline void
 104     PB_ASSOC_COND_DEALTOR_CLASS_C_DEC::
 105     set_no_action()
 106     {
 107       m_no_action_destructor = true;
 108     }
 109
 110     PB_ASSOC_COND_DEALTOR_CLASS_T_DEC
 111     inline
 112     PB_ASSOC_COND_DEALTOR_CLASS_C_DEC::
 113     ~cond_dealtor()
 114     {
 115       if (m_no_action_destructor)
 116         return;
 117
 118       s_alloc.deallocate(m_p_e, 1);
 119     }
 120
 121 #undef PB_ASSOC_COND_DEALTOR_CLASS_T_DEC
 122 #undef PB_ASSOC_COND_DEALTOR_CLASS_C_DEC
 123
 124   } // namespace detail
 125
 126 } // namespace pb_assoc
 127
 128 #endif // #ifndef COND_DEALTOR_HPP
 129