prefix_search_node_update_imp.hpp
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// -*- C++ -*-
// Copyright (C) 2005-2013 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
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// warranty.
/**
* @file trie_policy/prefix_search_node_update_imp.hpp
* Contains an implementation of prefix_search_node_update.
*/
PB_DS_CLASS_T_DEC
std::pair<
typename PB_DS_CLASS_C_DEC::const_iterator,
typename PB_DS_CLASS_C_DEC::const_iterator>
PB_DS_CLASS_C_DEC::
prefix_range(key_const_reference r_key) const
{
const access_traits& r_traits = get_access_traits();
return (prefix_range(r_traits.begin(r_key), r_traits.end(r_key)));
}
PB_DS_CLASS_T_DEC
std::pair<
typename PB_DS_CLASS_C_DEC::iterator,
typename PB_DS_CLASS_C_DEC::iterator>
PB_DS_CLASS_C_DEC::
prefix_range(key_const_reference r_key)
{
return (prefix_range(get_access_traits().begin(r_key),
get_access_traits().end(r_key)));
}
PB_DS_CLASS_T_DEC
std::pair<
typename PB_DS_CLASS_C_DEC::const_iterator,
typename PB_DS_CLASS_C_DEC::const_iterator>
PB_DS_CLASS_C_DEC::
prefix_range(typename access_traits::const_iterator b,
typename access_traits::const_iterator e) const
{
const std::pair<iterator, iterator> non_const_ret =
const_cast<PB_DS_CLASS_C_DEC* >(this)->prefix_range(b, e);
return (std::make_pair(const_iterator(non_const_ret.first),
const_iterator(non_const_ret.second)));
}
PB_DS_CLASS_T_DEC
std::pair<
typename PB_DS_CLASS_C_DEC::iterator,
typename PB_DS_CLASS_C_DEC::iterator>
PB_DS_CLASS_C_DEC::
prefix_range(typename access_traits::const_iterator b,
typename access_traits::const_iterator e)
{
Node_Itr nd_it = node_begin();
Node_Itr end_nd_it = node_end();
const access_traits& r_traits = get_access_traits();
const size_type given_range_length = std::distance(b, e);
while (true)
{
if (nd_it == end_nd_it)
return (std::make_pair(end(), end()));
const size_type common_range_length =
base_type::common_prefix_len(nd_it, b, e, r_traits);
if (common_range_length >= given_range_length)
{
iterator ret_b = this->leftmost_it(nd_it);
iterator ret_e = this->rightmost_it(nd_it);
return (std::make_pair(ret_b, ++ret_e));
}
nd_it = next_child(nd_it, b, e, end_nd_it, r_traits);
}
}
PB_DS_CLASS_T_DEC
typename PB_DS_CLASS_C_DEC::node_iterator
PB_DS_CLASS_C_DEC::
next_child(node_iterator nd_it, typename access_traits::const_iterator b,
typename access_traits::const_iterator e, node_iterator end_nd_it,
const access_traits& r_traits)
{
const size_type num_children = nd_it.num_children();
node_iterator ret = end_nd_it;
size_type max_length = 0;
for (size_type i = 0; i < num_children; ++i)
{
node_iterator pot = nd_it.get_child(i);
const size_type common_range_length =
base_type::common_prefix_len(pot, b, e, r_traits);
if (common_range_length > max_length)
{
ret = pot;
max_length = common_range_length;
}
}
return (ret);
}
PB_DS_CLASS_T_DEC
inline void
PB_DS_CLASS_C_DEC::
operator()(node_iterator /*nd_it*/, node_const_iterator /*end_nd_it*/) const
{ }