# tree_policy.hpp

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    00001 // -*- C++ -*-
    00002
    00003 // Copyright (C) 2005, 2006 Free Software Foundation, Inc.
    00004 //
    00005 // This file is part of the GNU ISO C++ Library.  This library is free
    00006 // software; you can redistribute it and/or modify it under the terms
    00007 // of the GNU General Public License as published by the Free Software
    00008 // Foundation; either version 2, or (at your option) any later
    00009 // version.
    00010
    00011 // This library is distributed in the hope that it will be useful, but
    00012 // WITHOUT ANY WARRANTY; without even the implied warranty of
    00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00014 // General Public License for more details.
    00015
    00016 // You should have received a copy of the GNU General Public License
    00017 // along with this library; see the file COPYING.  If not, write to
    00018 // the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
    00019 // MA 02111-1307, USA.
    00020
    00021 // As a special exception, you may use this file as part of a free
    00022 // software library without restriction.  Specifically, if other files
    00023 // instantiate templates or use macros or inline functions from this
    00024 // file, or you compile this file and link it with other files to
    00025 // produce an executable, this file does not by itself cause the
    00026 // resulting executable to be covered by the GNU General Public
    00027 // License.  This exception does not however invalidate any other
    00028 // reasons why the executable file might be covered by the GNU General
    00029 // Public License.
    00030
    00031 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
    00032
    00033 // Permission to use, copy, modify, sell, and distribute this software
    00034 // is hereby granted without fee, provided that the above copyright
    00035 // notice appears in all copies, and that both that copyright notice
    00036 // and this permission notice appear in supporting documentation. None
    00037 // of the above authors, nor IBM Haifa Research Laboratories, make any
    00038 // representation about the suitability of this software for any
    00039 // purpose. It is provided "as is" without express or implied
    00040 // warranty.
    00041
    00042 /**
    00043  * @file tree_policy.hpp
    00044  * Contains tree-related policies.
    00045  */
    00046
    00047 #ifndef PB_DS_TREE_POLICY_HPP
    00048 #define PB_DS_TREE_POLICY_HPP
    00049
    00050 #include <iterator>
    00051 #include <ext/pb_ds/detail/type_utils.hpp>
    00052 #include <ext/pb_ds/detail/basic_tree_policy/basic_tree_policy_base.hpp>
    00053
    00054 namespace __gnu_pbds
    00055 {
    00056   // A null node updator, indicating that no node updates are required.
    00057   template<typename Const_Node_Iterator,
    00058        typename Node_Iterator,
    00059        typename Cmp_Fn,
    00060        typename Allocator>
    00061   struct null_tree_node_update
    00062   { };
    00063
    00064 #define PB_DS_CLASS_T_DEC \
    00065   template<typename Const_Node_Iterator, class Node_Iterator, class Cmp_Fn, class Allocator>
    00066
    00067 #define PB_DS_CLASS_C_DEC \
    00068   tree_order_statistics_node_update<Const_Node_Iterator, Node_Iterator, Cmp_Fn, Allocator>
    00069
    00070 #define PB_DS_BASE_C_DEC                        \
    00071   detail::basic_tree_policy_base<Const_Node_Iterator, Node_Iterator, Allocator>
    00072
    00073   // Functor updating ranks of entrees.
    00074   template<typename Const_Node_Iterator, typename Node_Iterator,
    00075        typename Cmp_Fn, typename Allocator>
    00076   class tree_order_statistics_node_update : private PB_DS_BASE_C_DEC
    00077   {
    00078   private:
    00079     typedef PB_DS_BASE_C_DEC base_type;
    00080
    00081   public:
    00082     typedef Cmp_Fn cmp_fn;
    00083     typedef Allocator allocator;
    00084     typedef typename allocator::size_type size_type;
    00085     typedef typename base_type::key_type key_type;
    00086     typedef typename base_type::const_key_reference const_key_reference;
    00087
    00088     typedef size_type metadata_type;
    00089     typedef Const_Node_Iterator const_node_iterator;
    00090     typedef Node_Iterator node_iterator;
    00091     typedef typename const_node_iterator::value_type const_iterator;
    00092     typedef typename node_iterator::value_type iterator;
    00093
    00094     // Finds an entry by __order. Returns a const_iterator to the
    00095     // entry with the __order order, or a const_iterator to the
    00096     // container object's end if order is at least the size of the
    00097     // container object.
    00098     inline const_iterator
    00099     find_by_order(size_type order) const;
    00100
    00101     // Finds an entry by __order. Returns an iterator to the entry
    00102     // with the __order order, or an iterator to the container
    00103     // object's end if order is at least the size of the container
    00104     // object.
    00105     inline iterator
    00106     find_by_order(size_type order);
    00107
    00108     // Returns the order of a key within a sequence. For exapmle, if
    00109     // r_key is the smallest key, this method will return 0; if r_key
    00110     // is a key between the smallest and next key, this method will
    00111     // return 1; if r_key is a key larger than the largest key, this
    00112     // method will return the size of r_c.
    00113     inline size_type
    00114     order_of_key(const_key_reference r_key) const;
    00115
    00116   private:
    00117     // Const reference to the container's value-type.
    00118     typedef typename base_type::const_reference const_reference;
    00119
    00120     // Const pointer to the container's value-type.
    00121     typedef typename base_type::const_pointer const_pointer;
    00122
    00123     typedef typename allocator::template rebind<metadata_type>::other metadata_rebind;
    00124     // Const metadata reference.
    00125     typedef typename metadata_rebind::const_reference const_metadata_reference;
    00126
    00127     // Metadata reference.
    00128     typedef typename metadata_rebind::reference metadata_reference;
    00129
    00130     // Returns the const_node_iterator associated with the tree's root node.
    00131     virtual const_node_iterator
    00132     node_begin() const = 0;
    00133
    00134     // Returns the node_iterator associated with the tree's root node.
    00135     virtual node_iterator
    00136     node_begin() = 0;
    00137
    00138     // Returns the const_node_iterator associated with a just-after leaf node.
    00139     virtual const_node_iterator
    00140     node_end() const = 0;
    00141
    00142     // Returns the node_iterator associated with a just-after leaf node.
    00143     virtual node_iterator
    00144     node_end() = 0;
    00145
    00146     // Access to the cmp_fn object.
    00147     virtual cmp_fn&
    00148     get_cmp_fn() = 0;
    00149
    00150   protected:
    00151     // Updates the rank of a node through a node_iterator node_it;
    00152     // end_nd_it is the end node iterator.
    00153     inline void
    00154     operator()(node_iterator node_it, const_node_iterator end_nd_it) const;
    00155
    00156     virtual
    00157     ~tree_order_statistics_node_update();
    00158   };
    00159
    00160 #include <ext/pb_ds/detail/tree_policy/order_statistics_imp.hpp>
    00161
    00162 #undef PB_DS_CLASS_T_DEC
    00163 #undef PB_DS_CLASS_C_DEC
    00164 #undef PB_DS_BASE_C_DEC
    00165
    00166 } // namespace __gnu_pbds
    00167
    00168 #endif