libstdc++-v3/include/ext/pb_ds/detail/ov_tree_map_/cond_dtor.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_dtor.hpp
  44  * Contains a conditional destructor
  45  */
  46
  47 template<typename Size_Type>
  48 class cond_dtor
  49 {
  50 public:
  51   cond_dtor(value_vector a_vec, iterator& r_last_it, Size_Type total_size)
  52   : m_a_vec(a_vec), m_r_last_it(r_last_it), m_max_size(total_size),
  53     m_no_action(false)
  54   { }
  55
  56   ~cond_dtor()
  57   {
  58     if (m_no_action)
  59       return;
  60     iterator it = m_a_vec;
  61     while (it != m_r_last_it)
  62       {
  63         it->~value_type();
  64         ++it;
  65       }
  66
  67     if (m_max_size > 0)
  68       value_allocator().deallocate(m_a_vec, m_max_size);
  69   }
  70
  71   inline void
  72   set_no_action()
  73   { m_no_action = true; }
  74
  75 protected:
  76   value_vector m_a_vec;
  77   iterator& m_r_last_it;
  78   const Size_Type m_max_size;
  79   bool m_no_action;
  80 };