mingw/lib/gcc/mingw32/4.4.0/include/c++/ext/pb_ds/detail/pat_trie_/split_join_branch_bag.hpp

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005, 2006, 2007, 2008, 2009 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 3, 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 // Under Section 7 of GPL version 3, you are granted additional
  17 // permissions described in the GCC Runtime Library Exception, version
  18 // 3.1, as published by the Free Software Foundation.
  19
  20 // You should have received a copy of the GNU General Public License and
  21 // a copy of the GCC Runtime Library Exception along with this program;
  22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 // <http://www.gnu.org/licenses/>.
  24
  25 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
  26
  27 // Permission to use, copy, modify, sell, and distribute this software
  28 // is hereby granted without fee, provided that the above copyright
  29 // notice appears in all copies, and that both that copyright notice
  30 // and this permission notice appear in supporting documentation. None
  31 // of the above authors, nor IBM Haifa Research Laboratories, make any
  32 // representation about the suitability of this software for any
  33 // purpose. It is provided "as is" without express or implied
  34 // warranty.
  35
  36 /**
  37  * @file split_join_branch_bag.hpp
  38  * Contains an implementation class for pat_trie_.
  39  */
  40
  41 class split_join_branch_bag
  42 {
  43 private:
  44   typedef
  45   std::list<
  46   internal_node_pointer,
  47   typename Allocator::template rebind<
  48   internal_node_pointer>::other>
  49   bag_t;
  50
  51 public:
  52
  53   void
  54   add_branch()
  55   {
  56     internal_node_pointer p_nd = s_internal_node_allocator.allocate(1);
  57     __try
  58       {
  59         m_bag.push_back(p_nd);
  60       }
  61     __catch(...)
  62       {
  63         s_internal_node_allocator.deallocate(p_nd, 1);
  64         __throw_exception_again;
  65       }
  66   }
  67
  68   internal_node_pointer
  69   get_branch()
  70   {
  71     _GLIBCXX_DEBUG_ASSERT(!m_bag.empty());
  72     internal_node_pointer p_nd =* m_bag.begin();
  73     m_bag.pop_front();
  74     return p_nd;
  75   }
  76
  77   ~split_join_branch_bag()
  78   {
  79     while (!m_bag.empty())
  80       {
  81         internal_node_pointer p_nd =* m_bag.begin();
  82         s_internal_node_allocator.deallocate(p_nd, 1);
  83         m_bag.pop_front();
  84       }
  85   }
  86
  87   inline bool
  88   empty() const
  89   { return m_bag.empty(); }
  90
  91 private:
  92   bag_t m_bag;
  93 };