trie_policy.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
// 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