libstdc++-v3/include/ext/pb_ds/detail/pat_trie_/split_join_branch_bag.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 split_join_branch_bag.hpp
  44  * Contains an implementation class for pat_trie_.
  45  */
  46
  47 class split_join_branch_bag
  48 {
  49 private:
  50   typedef
  51   std::list<
  52   internal_node_pointer,
  53   typename Allocator::template rebind<
  54   internal_node_pointer>::other>
  55   bag_t;
  56
  57 public:
  58
  59   void
  60   add_branch()
  61   {
  62     internal_node_pointer p_nd = s_internal_node_allocator.allocate(1);
  63
  64     try
  65       {
  66         m_bag.push_back(p_nd);
  67       }
  68     catch(...)
  69       {
  70         s_internal_node_allocator.deallocate(p_nd, 1);
  71
  72         throw;
  73       }
  74   }
  75
  76   internal_node_pointer
  77   get_branch()
  78   {
  79     _GLIBCXX_DEBUG_ASSERT(!m_bag.empty());
  80
  81     internal_node_pointer p_nd =* m_bag.begin();
  82
  83     m_bag.pop_front();
  84
  85     return (p_nd);
  86   }
  87
  88   ~split_join_branch_bag()
  89   {
  90     while (!m_bag.empty())
  91       {
  92         internal_node_pointer p_nd =* m_bag.begin();
  93
  94         s_internal_node_allocator.deallocate(p_nd, 1);
  95
  96         m_bag.pop_front();
  97       }
  98   }
  99
 100   inline bool
 101   empty() const
 102   {
 103     return (m_bag.empty());
 104   }
 105
 106 private:
 107   bag_t m_bag;
 108 };