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Diffstat (limited to 'gcc-4.9/libstdc++-v3/include/ext/pb_ds/detail/trie_policy/trie_policy_base.hpp')
| -rw-r--r-- | gcc-4.9/libstdc++-v3/include/ext/pb_ds/detail/trie_policy/trie_policy_base.hpp | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/gcc-4.9/libstdc++-v3/include/ext/pb_ds/detail/trie_policy/trie_policy_base.hpp b/gcc-4.9/libstdc++-v3/include/ext/pb_ds/detail/trie_policy/trie_policy_base.hpp new file mode 100644 index 0000000..3914684 --- /dev/null +++ b/gcc-4.9/libstdc++-v3/include/ext/pb_ds/detail/trie_policy/trie_policy_base.hpp @@ -0,0 +1,207 @@ +// -*- C++ -*- + +// Copyright (C) 2005-2014 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/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/branch_policy/branch_policy.hpp> + +namespace __gnu_pbds +{ + namespace detail + { + /// Base class for trie policies. + template<typename Node_CItr, typename Node_Itr, + typename _ATraits, typename _Alloc> + class trie_policy_base + : public branch_policy<Node_CItr, Node_Itr, _Alloc> + { + typedef branch_policy<Node_CItr, Node_Itr, _Alloc> base_type; + + public: + typedef _ATraits access_traits; + typedef _Alloc allocator_type; + typedef typename allocator_type::size_type size_type; + typedef null_type metadata_type; + typedef Node_CItr node_const_iterator; + typedef Node_Itr node_iterator; + typedef typename node_const_iterator::value_type const_iterator; + typedef typename node_iterator::value_type iterator; + typedef typename base_type::key_type key_type; + typedef typename base_type::key_const_reference key_const_reference; + + protected: + virtual const_iterator + end() const = 0; + + virtual iterator + end() = 0; + + virtual node_const_iterator + node_begin() const = 0; + + virtual node_iterator + node_begin() = 0; + + virtual node_const_iterator + node_end() const = 0; + + virtual node_iterator + node_end() = 0; + + virtual const access_traits& + get_access_traits() const = 0; + + private: + typedef typename access_traits::const_iterator e_const_iterator; + typedef std::pair<e_const_iterator, e_const_iterator> prefix_range_t; + + protected: + static size_type + common_prefix_len(node_iterator, e_const_iterator, + e_const_iterator, const access_traits&); + + static iterator + leftmost_it(node_iterator); + + static iterator + rightmost_it(node_iterator); + + static bool + less(e_const_iterator, e_const_iterator, e_const_iterator, + e_const_iterator, const access_traits&); + }; + + +#define PB_DS_CLASS_T_DEC \ + template<typename Node_CItr, typename Node_Itr, \ + typename _ATraits, typename _Alloc> + +#define PB_DS_CLASS_C_DEC \ + trie_policy_base<Node_CItr, Node_Itr, _ATraits, _Alloc> + + 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, e_const_iterator b_r, + e_const_iterator e_r, const access_traits& r_traits) + { + prefix_range_t pref_range = nd_it.valid_prefix(); + + e_const_iterator b_l = pref_range.first; + e_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(e_const_iterator b_l, e_const_iterator e_l, + e_const_iterator b_r, e_const_iterator e_r, + const 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 + + } // namespace detail +} // namespace __gnu_pbds + +#endif // #ifndef PB_DS_TRIE_POLICY_BASE_HPP |