--- /dev/null
+// -*- C++ -*-
+
+// Copyright (C) 2005, 2006, 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 trie_policy_base.hpp
+ * Contains an implementation of trie_policy_base.
+ */
+
+#ifndef PB_DS_TRIE_POLICY_BASE_HPP
+#define PB_DS_TRIE_POLICY_BASE_HPP
+
+#include <ext/pb_ds/detail/basic_tree_policy/basic_tree_policy_base.hpp>
+
+namespace __gnu_pbds
+{
+ namespace detail
+ {
+
+#define PB_DS_CLASS_T_DEC \
+ template< \
+ class Const_Node_Iterator, \
+ class Node_Iterator, \
+ class E_Access_Traits, \
+ typename Allocator>
+
+#define PB_DS_CLASS_C_DEC \
+ trie_policy_base< \
+ Const_Node_Iterator, \
+ Node_Iterator, \
+ E_Access_Traits, \
+ Allocator>
+
+#define PB_DS_BASE_C_DEC \
+ basic_tree_policy_base< \
+ Const_Node_Iterator, \
+ Node_Iterator, \
+ Allocator>
+
+ template<typename Const_Node_Iterator,
+ class Node_Iterator,
+ class E_Access_Traits,
+ class Allocator>
+ class trie_policy_base : public PB_DS_BASE_C_DEC
+ {
+
+ public:
+
+ typedef E_Access_Traits e_access_traits;
+
+ typedef Allocator allocator_type;
+
+ typedef typename allocator_type::size_type size_type;
+
+ typedef null_node_metadata metadata_type;
+
+ typedef Const_Node_Iterator const_node_iterator;
+
+ typedef Node_Iterator node_iterator;
+
+ typedef typename const_node_iterator::value_type const_iterator;
+
+ typedef typename node_iterator::value_type iterator;
+
+ public:
+
+ typedef typename PB_DS_BASE_C_DEC::key_type key_type;
+
+ typedef
+ typename PB_DS_BASE_C_DEC::const_key_reference
+ const_key_reference;
+
+ protected:
+
+ virtual const_iterator
+ end() const = 0;
+
+ virtual iterator
+ end() = 0;
+
+ virtual const_node_iterator
+ node_begin() const = 0;
+
+ virtual node_iterator
+ node_begin() = 0;
+
+ virtual const_node_iterator
+ node_end() const = 0;
+
+ virtual node_iterator
+ node_end() = 0;
+
+ virtual const e_access_traits&
+ get_e_access_traits() const = 0;
+
+ private:
+ typedef
+ std::pair<
+ typename e_access_traits::const_iterator,
+ typename e_access_traits::const_iterator>
+ prefix_range_t;
+
+ typedef PB_DS_BASE_C_DEC base_type;
+
+ protected:
+ static size_type
+ common_prefix_len(node_iterator nd_it, typename e_access_traits::const_iterator b_r, typename e_access_traits::const_iterator e_r, const e_access_traits& r_traits);
+
+ static iterator
+ leftmost_it(node_iterator nd_it);
+
+ static iterator
+ rightmost_it(node_iterator nd_it);
+
+ static bool
+ less(typename e_access_traits::const_iterator b_l, typename e_access_traits::const_iterator e_l, typename e_access_traits::const_iterator b_r, typename e_access_traits::const_iterator e_r, const e_access_traits& r_traits);
+ };
+
+ PB_DS_CLASS_T_DEC
+ typename PB_DS_CLASS_C_DEC::size_type
+ PB_DS_CLASS_C_DEC::
+ common_prefix_len(node_iterator nd_it, typename e_access_traits::const_iterator b_r, typename e_access_traits::const_iterator e_r, const e_access_traits& r_traits)
+ {
+ prefix_range_t pref_range = nd_it.valid_prefix();
+
+ typename e_access_traits::const_iterator b_l = pref_range.first;
+ typename e_access_traits::const_iterator e_l = pref_range.second;
+
+ const size_type range_length_l =
+ std::distance(b_l, e_l);
+
+ const size_type range_length_r =
+ std::distance(b_r, e_r);
+
+ if (range_length_r < range_length_l)
+ {
+ std::swap(b_l, b_r);
+
+ std::swap(e_l, e_r);
+ }
+
+ size_type ret = 0;
+
+ while (b_l != e_l)
+ {
+ if (r_traits.e_pos(*b_l) != r_traits.e_pos(*b_r))
+ return (ret);
+
+ ++ret;
+
+ ++b_l;
+
+ ++b_r;
+ }
+
+ return (ret);
+ }
+
+ PB_DS_CLASS_T_DEC
+ typename PB_DS_CLASS_C_DEC::iterator
+ PB_DS_CLASS_C_DEC::
+ leftmost_it(node_iterator nd_it)
+ {
+ if (nd_it.num_children() == 0)
+ return (*nd_it);
+
+ return (leftmost_it(nd_it.get_child(0)));
+ }
+
+ PB_DS_CLASS_T_DEC
+ typename PB_DS_CLASS_C_DEC::iterator
+ PB_DS_CLASS_C_DEC::
+ rightmost_it(node_iterator nd_it)
+ {
+ const size_type num_children = nd_it.num_children();
+
+ if (num_children == 0)
+ return (*nd_it);
+
+ return (rightmost_it(nd_it.get_child(num_children - 1)));
+ }
+
+ PB_DS_CLASS_T_DEC
+ bool
+ PB_DS_CLASS_C_DEC::
+ less(typename e_access_traits::const_iterator b_l, typename e_access_traits::const_iterator e_l, typename e_access_traits::const_iterator b_r, typename e_access_traits::const_iterator e_r, const e_access_traits& r_traits)
+ {
+ while (b_l != e_l)
+ {
+ if (b_r == e_r)
+ return (false);
+
+ size_type l_pos =
+ r_traits.e_pos(*b_l);
+ size_type r_pos =
+ r_traits.e_pos(*b_r);
+
+ if (l_pos != r_pos)
+ return (l_pos < r_pos);
+
+ ++b_l;
+ ++b_r;
+ }
+
+ return (b_r != e_r);
+ }
+
+#undef PB_DS_CLASS_T_DEC
+
+#undef PB_DS_CLASS_C_DEC
+
+#undef PB_DS_BASE_C_DEC
+
+ } // namespace detail
+} // namespace __gnu_pbds
+
+#endif // #ifndef PB_DS_TRIE_POLICY_BASE_HPP
+
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