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// -*- C++ -*-

// Copyright (C) 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library is free

// software; you can redistribute it and/or modify it under the terms

// of the GNU General Public License as published by the Free Software

// Foundation; either version 3, or (at your option) any later

// version.

// This library is distributed in the hope that it will be useful, but

// WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

// General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional

// permissions described in the GCC Runtime Library Exception, version

// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and

// a copy of the GCC Runtime Library Exception along with this program;

// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

// <http://www.gnu.org/licenses/>.

// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.

// Permission to use, copy, modify, sell, and distribute this software

// is hereby granted without fee, provided that the above copyright

// notice appears in all copies, and that both that copyright notice

// and this permission notice appear in supporting documentation. None

// of the above authors, nor IBM Haifa Research Laboratories, make any

// representation about the suitability of this software for any

// purpose. It is provided "as is" without express or implied

// warranty.

/**

 * @file split_join_branch_bag.hpp

 * Contains an implementation class for pat_trie_.

 */

class split_join_branch_bag

{

private:

  typedef

  std::list<

  internal_node_pointer,

  typename Allocator::template rebind<

  internal_node_pointer>::other>

  bag_t;

public:

  void

  add_branch()

  {

    internal_node_pointer p_nd = s_internal_node_allocator.allocate(1);

    __try

      {

        m_bag.push_back(p_nd);

      }

    __catch(...)

      {

        s_internal_node_allocator.deallocate(p_nd, 1);

        __throw_exception_again;

      }

  }

  internal_node_pointer

  get_branch()

  {

    _GLIBCXX_DEBUG_ASSERT(!m_bag.empty());

    internal_node_pointer p_nd =* m_bag.begin();

    m_bag.pop_front();

    return p_nd;

  }

  ~split_join_branch_bag()

  {

    while (!m_bag.empty())

      {

        internal_node_pointer p_nd =* m_bag.begin();

        s_internal_node_allocator.deallocate(p_nd, 1);

        m_bag.pop_front();

      }

  }

  inline bool

  empty() const

  { return m_bag.empty(); }

private:

  bag_t m_bag;

};