361 lines
12 KiB
C++
361 lines
12 KiB
C++
// -*- C++ -*-
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// Copyright (C) 2005-2016 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the terms
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// of the GNU General Public License as published by the Free Software
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// Foundation; either version 3, or (at your option) any later
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// version.
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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// Permission to use, copy, modify, sell, and distribute this software
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// is hereby granted without fee, provided that the above copyright
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// notice appears in all copies, and that both that copyright notice
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// and this permission notice appear in supporting documentation. None
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// of the above authors, nor IBM Haifa Research Laboratories, make any
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// representation about the suitability of this software for any
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// purpose. It is provided "as is" without express or implied
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// warranty.
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/**
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* @file trie_policy.hpp
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* Contains trie-related policies.
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*/
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#ifndef PB_DS_TRIE_POLICY_HPP
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#define PB_DS_TRIE_POLICY_HPP
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#include <bits/c++config.h>
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#include <string>
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#include <ext/pb_ds/detail/type_utils.hpp>
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#include <ext/pb_ds/detail/trie_policy/trie_policy_base.hpp>
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namespace __gnu_pbds
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{
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#define PB_DS_CLASS_T_DEC \
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template<typename String, typename String::value_type Min_E_Val, \
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typename String::value_type Max_E_Val, bool Reverse, \
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typename _Alloc>
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#define PB_DS_CLASS_C_DEC \
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trie_string_access_traits<String, Min_E_Val,Max_E_Val,Reverse,_Alloc>
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/**
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* Element access traits for string types.
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*
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* @tparam String String type.
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* @tparam Min_E_Val Minimal element value.
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* @tparam Max_E_Val Maximum element value.
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* @tparam Reverse Reverse iteration should be used.
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* Default: false.
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* @tparam _Alloc Allocator type.
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*/
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template<typename String = std::string,
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typename String::value_type Min_E_Val = detail::__numeric_traits<typename String::value_type>::__min,
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typename String::value_type Max_E_Val = detail::__numeric_traits<typename String::value_type>::__max,
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bool Reverse = false,
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typename _Alloc = std::allocator<char> >
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struct trie_string_access_traits
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{
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public:
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typedef typename _Alloc::size_type size_type;
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typedef String key_type;
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typedef typename _Alloc::template rebind<key_type> __rebind_k;
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typedef typename __rebind_k::other::const_reference key_const_reference;
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enum
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{
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reverse = Reverse
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};
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/// Element const iterator type.
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typedef typename detail::__conditional_type<Reverse, \
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typename String::const_reverse_iterator, \
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typename String::const_iterator>::__type const_iterator;
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/// Element type.
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typedef typename std::iterator_traits<const_iterator>::value_type e_type;
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enum
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{
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min_e_val = Min_E_Val,
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max_e_val = Max_E_Val,
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max_size = max_e_val - min_e_val + 1
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};
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PB_DS_STATIC_ASSERT(min_max_size, max_size >= 2);
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/// Returns a const_iterator to the first element of
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/// key_const_reference agumnet.
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inline static const_iterator
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begin(key_const_reference);
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/// Returns a const_iterator to the after-last element of
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/// key_const_reference argument.
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inline static const_iterator
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end(key_const_reference);
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/// Maps an element to a position.
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inline static size_type
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e_pos(e_type e);
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private:
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inline static const_iterator
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begin_imp(key_const_reference, detail::false_type);
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inline static const_iterator
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begin_imp(key_const_reference, detail::true_type);
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inline static const_iterator
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end_imp(key_const_reference, detail::false_type);
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inline static const_iterator
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end_imp(key_const_reference, detail::true_type);
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static detail::integral_constant<int, Reverse> s_rev_ind;
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};
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#include <ext/pb_ds/detail/trie_policy/trie_string_access_traits_imp.hpp>
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#undef PB_DS_CLASS_T_DEC
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#undef PB_DS_CLASS_C_DEC
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#define PB_DS_CLASS_T_DEC \
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template<typename Node_CItr,typename Node_Itr, \
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typename _ATraits, typename _Alloc>
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#define PB_DS_CLASS_C_DEC \
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trie_prefix_search_node_update<Node_CItr, Node_Itr, \
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_ATraits,_Alloc>
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#define PB_DS_TRIE_POLICY_BASE \
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detail::trie_policy_base<Node_CItr,Node_Itr,_ATraits, _Alloc>
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/// A node updator that allows tries to be searched for the range of
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/// values that match a certain prefix.
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template<typename Node_CItr,
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typename Node_Itr,
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typename _ATraits,
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typename _Alloc>
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class trie_prefix_search_node_update : private PB_DS_TRIE_POLICY_BASE
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{
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private:
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typedef PB_DS_TRIE_POLICY_BASE base_type;
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public:
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typedef typename base_type::key_type key_type;
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typedef typename base_type::key_const_reference key_const_reference;
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/// Element access traits.
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typedef _ATraits access_traits;
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/// Const element iterator.
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typedef typename access_traits::const_iterator a_const_iterator;
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/// _Alloc type.
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typedef _Alloc allocator_type;
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/// Size type.
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typedef typename allocator_type::size_type size_type;
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typedef null_type metadata_type;
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typedef Node_Itr node_iterator;
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typedef Node_CItr node_const_iterator;
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typedef typename node_iterator::value_type iterator;
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typedef typename node_const_iterator::value_type const_iterator;
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/// Finds the const iterator range corresponding to all values
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/// whose prefixes match r_key.
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std::pair<const_iterator, const_iterator>
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prefix_range(key_const_reference) const;
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/// Finds the iterator range corresponding to all values whose
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/// prefixes match r_key.
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std::pair<iterator, iterator>
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prefix_range(key_const_reference);
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/// Finds the const iterator range corresponding to all values
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/// whose prefixes match [b, e).
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std::pair<const_iterator, const_iterator>
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prefix_range(a_const_iterator, a_const_iterator) const;
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/// Finds the iterator range corresponding to all values whose
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/// prefixes match [b, e).
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std::pair<iterator, iterator>
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prefix_range(a_const_iterator, a_const_iterator);
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protected:
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/// Called to update a node's metadata.
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inline void
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operator()(node_iterator node_it, node_const_iterator end_nd_it) const;
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private:
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node_iterator
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next_child(node_iterator, a_const_iterator, a_const_iterator,
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node_iterator, const access_traits&);
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/// Returns the const iterator associated with the just-after last element.
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virtual const_iterator
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end() const = 0;
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/// Returns the iterator associated with the just-after last element.
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virtual iterator
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end() = 0;
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/// Returns the node_const_iterator associated with the trie's root node.
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virtual node_const_iterator
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node_begin() const = 0;
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/// Returns the node_iterator associated with the trie's root node.
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virtual node_iterator
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node_begin() = 0;
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/// Returns the node_const_iterator associated with a just-after leaf node.
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virtual node_const_iterator
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node_end() const = 0;
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/// Returns the node_iterator associated with a just-after leaf node.
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virtual node_iterator
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node_end() = 0;
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/// Access to the cmp_fn object.
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virtual const access_traits&
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get_access_traits() const = 0;
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};
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#include <ext/pb_ds/detail/trie_policy/prefix_search_node_update_imp.hpp>
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#undef PB_DS_CLASS_C_DEC
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#define PB_DS_CLASS_C_DEC \
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trie_order_statistics_node_update<Node_CItr, Node_Itr, \
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_ATraits, _Alloc>
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/// Functor updating ranks of entrees.
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template<typename Node_CItr,
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typename Node_Itr,
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typename _ATraits,
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typename _Alloc>
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class trie_order_statistics_node_update : private PB_DS_TRIE_POLICY_BASE
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{
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private:
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typedef PB_DS_TRIE_POLICY_BASE base_type;
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public:
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typedef _ATraits access_traits;
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typedef typename access_traits::const_iterator a_const_iterator;
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typedef _Alloc allocator_type;
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typedef typename allocator_type::size_type size_type;
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typedef typename base_type::key_type key_type;
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typedef typename base_type::key_const_reference key_const_reference;
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typedef size_type metadata_type;
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typedef Node_CItr node_const_iterator;
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typedef Node_Itr node_iterator;
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typedef typename node_const_iterator::value_type const_iterator;
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typedef typename node_iterator::value_type iterator;
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/// Finds an entry by __order. Returns a const_iterator to the
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/// entry with the __order order, or a const_iterator to the
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/// container object's end if order is at least the size of the
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/// container object.
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inline const_iterator
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find_by_order(size_type) const;
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/// Finds an entry by __order. Returns an iterator to the entry
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/// with the __order order, or an iterator to the container
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/// object's end if order is at least the size of the container
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/// object.
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inline iterator
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find_by_order(size_type);
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/// Returns the order of a key within a sequence. For exapmle, if
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/// r_key is the smallest key, this method will return 0; if r_key
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/// is a key between the smallest and next key, this method will
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/// return 1; if r_key is a key larger than the largest key, this
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/// method will return the size of r_c.
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inline size_type
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order_of_key(key_const_reference) const;
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/// Returns the order of a prefix within a sequence. For exapmle,
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/// if [b, e] is the smallest prefix, this method will return 0; if
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/// r_key is a key between the smallest and next key, this method
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/// will return 1; if r_key is a key larger than the largest key,
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/// this method will return the size of r_c.
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inline size_type
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order_of_prefix(a_const_iterator, a_const_iterator) const;
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protected:
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/// Updates the rank of a node through a node_iterator node_it;
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/// end_nd_it is the end node iterator.
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inline void
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operator()(node_iterator, node_const_iterator) const;
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private:
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typedef typename base_type::const_reference const_reference;
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typedef typename base_type::const_pointer const_pointer;
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typedef typename _Alloc::template rebind<metadata_type> __rebind_m;
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typedef typename __rebind_m::other __rebind_ma;
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typedef typename __rebind_ma::const_reference metadata_const_reference;
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typedef typename __rebind_ma::reference metadata_reference;
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/// Returns true if the container is empty.
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virtual bool
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empty() const = 0;
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/// Returns the iterator associated with the trie's first element.
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virtual iterator
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begin() = 0;
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/// Returns the iterator associated with the trie's
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/// just-after-last element.
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virtual iterator
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end() = 0;
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/// Returns the node_const_iterator associated with the trie's root node.
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virtual node_const_iterator
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node_begin() const = 0;
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/// Returns the node_iterator associated with the trie's root node.
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virtual node_iterator
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node_begin() = 0;
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/// Returns the node_const_iterator associated with a just-after
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/// leaf node.
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virtual node_const_iterator
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node_end() const = 0;
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/// Returns the node_iterator associated with a just-after leaf node.
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virtual node_iterator
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node_end() = 0;
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/// Access to the cmp_fn object.
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virtual access_traits&
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get_access_traits() = 0;
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};
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#include <ext/pb_ds/detail/trie_policy/order_statistics_imp.hpp>
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#undef PB_DS_CLASS_T_DEC
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#undef PB_DS_CLASS_C_DEC
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#undef PB_DS_TRIE_POLICY_BASE
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} // namespace __gnu_pbds
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#endif
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