Edit File: trie_policy.hpp
// -*- C++ -*- // Copyright (C) 2005-2018 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.hpp * Contains trie-related policies. */ #ifndef PB_DS_TRIE_POLICY_HPP #define PB_DS_TRIE_POLICY_HPP #include <bits/c++config.h> #include <string> #include <ext/pb_ds/detail/type_utils.hpp> #include <ext/pb_ds/detail/trie_policy/trie_policy_base.hpp> namespace __gnu_pbds { #define PB_DS_CLASS_T_DEC \ template<typename String, typename String::value_type Min_E_Val, \ typename String::value_type Max_E_Val, bool Reverse, \ typename _Alloc> #define PB_DS_CLASS_C_DEC \ trie_string_access_traits<String, Min_E_Val,Max_E_Val,Reverse,_Alloc> /** * Element access traits for string types. * * @tparam String String type. * @tparam Min_E_Val Minimal element value. * @tparam Max_E_Val Maximum element value. * @tparam Reverse Reverse iteration should be used. * Default: false. * @tparam _Alloc Allocator type. */ template<typename String = std::string, typename String::value_type Min_E_Val = detail::__numeric_traits<typename String::value_type>::__min, typename String::value_type Max_E_Val = detail::__numeric_traits<typename String::value_type>::__max, bool Reverse = false, typename _Alloc = std::allocator<char> > struct trie_string_access_traits { public: typedef typename _Alloc::size_type size_type; typedef String key_type; typedef typename _Alloc::template rebind<key_type> __rebind_k; typedef typename __rebind_k::other::const_reference key_const_reference; enum { reverse = Reverse }; /// Element const iterator type. typedef typename detail::__conditional_type<Reverse, \ typename String::const_reverse_iterator, \ typename String::const_iterator>::__type const_iterator; /// Element type. typedef typename std::iterator_traits<const_iterator>::value_type e_type; enum { min_e_val = Min_E_Val, max_e_val = Max_E_Val, max_size = max_e_val - min_e_val + 1 }; PB_DS_STATIC_ASSERT(min_max_size, max_size >= 2); /// Returns a const_iterator to the first element of /// key_const_reference agumnet. inline static const_iterator begin(key_const_reference); /// Returns a const_iterator to the after-last element of /// key_const_reference argument. inline static const_iterator end(key_const_reference); /// Maps an element to a position. inline static size_type e_pos(e_type e); private: inline static const_iterator begin_imp(key_const_reference, detail::false_type); inline static const_iterator begin_imp(key_const_reference, detail::true_type); inline static const_iterator end_imp(key_const_reference, detail::false_type); inline static const_iterator end_imp(key_const_reference, detail::true_type); static detail::integral_constant<int, Reverse> s_rev_ind; }; #include <ext/pb_ds/detail/trie_policy/trie_string_access_traits_imp.hpp> #undef PB_DS_CLASS_T_DEC #undef PB_DS_CLASS_C_DEC #define PB_DS_CLASS_T_DEC \ template<typename Node_CItr,typename Node_Itr, \ typename _ATraits, typename _Alloc> #define PB_DS_CLASS_C_DEC \ trie_prefix_search_node_update<Node_CItr, Node_Itr, \ _ATraits,_Alloc> #define PB_DS_TRIE_POLICY_BASE \ detail::trie_policy_base<Node_CItr,Node_Itr,_ATraits, _Alloc> /// A node updator that allows tries to be searched for the range of /// values that match a certain prefix. template<typename Node_CItr, typename Node_Itr, typename _ATraits, typename _Alloc> class trie_prefix_search_node_update : private PB_DS_TRIE_POLICY_BASE { private: typedef PB_DS_TRIE_POLICY_BASE base_type; public: typedef typename base_type::key_type key_type; typedef typename base_type::key_const_reference key_const_reference; /// Element access traits. typedef _ATraits access_traits; /// Const element iterator. typedef typename access_traits::const_iterator a_const_iterator; /// _Alloc type. typedef _Alloc allocator_type; /// Size type. typedef typename allocator_type::size_type size_type; typedef null_type metadata_type; typedef Node_Itr node_iterator; typedef Node_CItr node_const_iterator; typedef typename node_iterator::value_type iterator; typedef typename node_const_iterator::value_type const_iterator; /// Finds the const iterator range corresponding to all values /// whose prefixes match r_key. std::pair<const_iterator, const_iterator> prefix_range(key_const_reference) const; /// Finds the iterator range corresponding to all values whose /// prefixes match r_key. std::pair<iterator, iterator> prefix_range(key_const_reference); /// Finds the const iterator range corresponding to all values /// whose prefixes match [b, e). std::pair<const_iterator, const_iterator> prefix_range(a_const_iterator, a_const_iterator) const; /// Finds the iterator range corresponding to all values whose /// prefixes match [b, e). std::pair<iterator, iterator> prefix_range(a_const_iterator, a_const_iterator); protected: /// Called to update a node's metadata. inline void operator()(node_iterator node_it, node_const_iterator end_nd_it) const; private: node_iterator next_child(node_iterator, a_const_iterator, a_const_iterator, node_iterator, const access_traits&); /// Returns the const iterator associated with the just-after last element. virtual const_iterator end() const = 0; /// Returns the iterator associated with the just-after last element. virtual iterator end() = 0; /// Returns the node_const_iterator associated with the trie's root node. virtual node_const_iterator node_begin() const = 0; /// Returns the node_iterator associated with the trie's root node. virtual node_iterator node_begin() = 0; /// Returns the node_const_iterator associated with a just-after leaf node. virtual node_const_iterator node_end() const = 0; /// Returns the node_iterator associated with a just-after leaf node. virtual node_iterator node_end() = 0; /// Access to the cmp_fn object. virtual const access_traits& get_access_traits() const = 0; }; #include <ext/pb_ds/detail/trie_policy/prefix_search_node_update_imp.hpp> #undef PB_DS_CLASS_C_DEC #define PB_DS_CLASS_C_DEC \ trie_order_statistics_node_update<Node_CItr, Node_Itr, \ _ATraits, _Alloc> /// Functor updating ranks of entrees. template<typename Node_CItr, typename Node_Itr, typename _ATraits, typename _Alloc> class trie_order_statistics_node_update : private PB_DS_TRIE_POLICY_BASE { private: typedef PB_DS_TRIE_POLICY_BASE base_type; public: typedef _ATraits access_traits; typedef typename access_traits::const_iterator a_const_iterator; typedef _Alloc allocator_type; typedef typename allocator_type::size_type size_type; typedef typename base_type::key_type key_type; typedef typename base_type::key_const_reference key_const_reference; typedef size_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; /// Finds an entry by __order. Returns a const_iterator to the /// entry with the __order order, or a const_iterator to the /// container object's end if order is at least the size of the /// container object. inline const_iterator find_by_order(size_type) const; /// Finds an entry by __order. Returns an iterator to the entry /// with the __order order, or an iterator to the container /// object's end if order is at least the size of the container /// object. inline iterator find_by_order(size_type); /// Returns the order of a key within a sequence. For exapmle, if /// r_key is the smallest key, this method will return 0; if r_key /// is a key between the smallest and next key, this method will /// return 1; if r_key is a key larger than the largest key, this /// method will return the size of r_c. inline size_type order_of_key(key_const_reference) const; /// Returns the order of a prefix within a sequence. For exapmle, /// if [b, e] is the smallest prefix, this method will return 0; if /// r_key is a key between the smallest and next key, this method /// will return 1; if r_key is a key larger than the largest key, /// this method will return the size of r_c. inline size_type order_of_prefix(a_const_iterator, a_const_iterator) const; protected: /// Updates the rank of a node through a node_iterator node_it; /// end_nd_it is the end node iterator. inline void operator()(node_iterator, node_const_iterator) const; private: typedef typename base_type::const_reference const_reference; typedef typename base_type::const_pointer const_pointer; typedef typename _Alloc::template rebind<metadata_type> __rebind_m; typedef typename __rebind_m::other __rebind_ma; typedef typename __rebind_ma::const_reference metadata_const_reference; typedef typename __rebind_ma::reference metadata_reference; /// Returns true if the container is empty. virtual bool empty() const = 0; /// Returns the iterator associated with the trie's first element. virtual iterator begin() = 0; /// Returns the iterator associated with the trie's /// just-after-last element. virtual iterator end() = 0; /// Returns the node_const_iterator associated with the trie's root node. virtual node_const_iterator node_begin() const = 0; /// Returns the node_iterator associated with the trie's root node. virtual node_iterator node_begin() = 0; /// Returns the node_const_iterator associated with a just-after /// leaf node. virtual node_const_iterator node_end() const = 0; /// Returns the node_iterator associated with a just-after leaf node. virtual node_iterator node_end() = 0; /// Access to the cmp_fn object. virtual access_traits& get_access_traits() = 0; }; #include <ext/pb_ds/detail/trie_policy/order_statistics_imp.hpp> #undef PB_DS_CLASS_T_DEC #undef PB_DS_CLASS_C_DEC #undef PB_DS_TRIE_POLICY_BASE } // namespace __gnu_pbds #endif
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