libstdc++-v3/include/ext/pb_ds/detail/cc_hash_table_map_/cond_key_dtor_entry_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_key_dtor_entry_dealtor.hpp
  44  * Contains a conditional key destructor, used for exception handling.
  45  */
  46
  47 namespace __gnu_pbds
  48 {
  49   namespace detail
  50   {
  51
  52 #define PB_DS_CLASS_T_DEC template<typename HT_Map>
  53 #define PB_DS_CLASS_C_DEC PB_DS_CKDED_CLASS_NAME<HT_Map>
  54
  55     /**
  56      * A conditional key destructor, used for exception handling.
  57      **/
  58     template<typename HT_Map>
  59     class PB_DS_CKDED_CLASS_NAME
  60     {
  61     public:
  62       typedef typename HT_Map::entry entry;
  63       typedef typename HT_Map::entry_allocator entry_allocator;
  64       typedef typename HT_Map::key_type key_type;
  65
  66       inline
  67       PB_DS_CKDED_CLASS_NAME(entry_allocator* p_a, entry* p_e);
  68
  69       inline
  70       ~PB_DS_CKDED_CLASS_NAME();
  71
  72       inline void
  73       set_key_destruct();
  74
  75       inline void
  76       set_no_action_destructor();
  77
  78     protected:
  79       entry_allocator* const m_p_a;
  80       entry* const m_p_e;
  81
  82       bool m_key_destruct;
  83       bool m_no_action_destructor;
  84     };
  85
  86     PB_DS_CLASS_T_DEC
  87     inline
  88     PB_DS_CLASS_C_DEC::
  89     PB_DS_CKDED_CLASS_NAME(entry_allocator* p_a, entry* p_e)
  90     : m_p_a(p_a), m_p_e(p_e), m_key_destruct(false),
  91       m_no_action_destructor(false)
  92     { }
  93
  94     PB_DS_CLASS_T_DEC
  95     inline void
  96     PB_DS_CLASS_C_DEC::
  97     set_key_destruct()
  98     { m_key_destruct = true; }
  99
 100     PB_DS_CLASS_T_DEC
 101     inline void
 102     PB_DS_CLASS_C_DEC::
 103     set_no_action_destructor()
 104     { m_no_action_destructor = true; }
 105
 106     PB_DS_CLASS_T_DEC
 107     inline
 108     PB_DS_CLASS_C_DEC::
 109     ~PB_DS_CKDED_CLASS_NAME()
 110     {
 111       if (m_no_action_destructor)
 112         return;
 113       if (m_key_destruct)
 114         m_p_e->m_value.first.~key_type();
 115       m_p_a->deallocate(m_p_e, 1);
 116     }
 117
 118 #undef PB_DS_CLASS_T_DEC
 119 #undef PB_DS_CLASS_C_DEC
 120
 121   } // namespace detail
 122 } // namespace __gnu_pbds
 123