libstdc++
tree_policy.hpp
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25 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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35 
36 /**
37  * @file tree_policy.hpp
38  * Contains tree-related policies.
39  */
40 
41 #ifndef PB_DS_TREE_POLICY_HPP
42 #define PB_DS_TREE_POLICY_HPP
43 
44 #include <bits/c++config.h>
45 #include <iterator>
48 
49 namespace __gnu_pbds
50 {
51 #define PB_DS_CLASS_T_DEC \
52  template<typename Node_CItr, typename Node_Itr, typename Cmp_Fn, \
53  typename _Alloc>
54 
55 #define PB_DS_CLASS_C_DEC \
56  tree_order_statistics_node_update<Node_CItr, Node_Itr, Cmp_Fn, _Alloc>
57 
58 #define PB_DS_BRANCH_POLICY_BASE \
59  detail::branch_policy<Node_CItr, Node_Itr, _Alloc>
60 
61  /// Functor updating ranks of entrees.
62  template<typename Node_CItr, typename Node_Itr,
63  typename Cmp_Fn, typename _Alloc>
64  class tree_order_statistics_node_update : private PB_DS_BRANCH_POLICY_BASE
65  {
66  private:
67  typedef PB_DS_BRANCH_POLICY_BASE base_type;
68 
69  public:
70  typedef Cmp_Fn cmp_fn;
71  typedef _Alloc allocator_type;
72  typedef typename allocator_type::size_type size_type;
73  typedef typename base_type::key_type key_type;
74  typedef typename base_type::key_const_reference key_const_reference;
75 
76  typedef size_type metadata_type;
77  typedef Node_CItr node_const_iterator;
78  typedef Node_Itr node_iterator;
79  typedef typename node_const_iterator::value_type const_iterator;
80  typedef typename node_iterator::value_type iterator;
81 
82  /// Finds an entry by __order. Returns a const_iterator to the
83  /// entry with the __order order, or a const_iterator to the
84  /// container object's end if order is at least the size of the
85  /// container object.
86  inline const_iterator
87  find_by_order(size_type) const;
88 
89  /// Finds an entry by __order. Returns an iterator to the entry
90  /// with the __order order, or an iterator to the container
91  /// object's end if order is at least the size of the container
92  /// object.
93  inline iterator
94  find_by_order(size_type);
95 
96  /// Returns the order of a key within a sequence. For exapmle, if
97  /// r_key is the smallest key, this method will return 0; if r_key
98  /// is a key between the smallest and next key, this method will
99  /// return 1; if r_key is a key larger than the largest key, this
100  /// method will return the size of r_c.
101  inline size_type
102  order_of_key(key_const_reference) const;
103 
104  private:
105  /// Const reference to the container's value-type.
106  typedef typename base_type::const_reference const_reference;
107 
108  /// Const pointer to the container's value-type.
109  typedef typename base_type::const_pointer const_pointer;
110 
111  typedef typename _Alloc::template rebind<metadata_type>::other __rebind_m;
112 
113  /// Const metadata reference.
114  typedef typename __rebind_m::const_reference metadata_const_reference;
115 
116  /// Metadata reference.
117  typedef typename __rebind_m::reference metadata_reference;
118 
119  /// Returns the node_const_iterator associated with the tree's root node.
120  virtual node_const_iterator
121  node_begin() const = 0;
122 
123  /// Returns the node_iterator associated with the tree's root node.
124  virtual node_iterator
125  node_begin() = 0;
126 
127  /// Returns the node_const_iterator associated with a just-after leaf node.
128  virtual node_const_iterator
129  node_end() const = 0;
130 
131  /// Returns the node_iterator associated with a just-after leaf node.
132  virtual node_iterator
133  node_end() = 0;
134 
135  /// Access to the cmp_fn object.
136  virtual cmp_fn&
137  get_cmp_fn() = 0;
138 
139  protected:
140  /// Updates the rank of a node through a node_iterator node_it;
141  /// end_nd_it is the end node iterator.
142  inline void
143  operator()(node_iterator, node_const_iterator) const;
144 
145  virtual
147  };
148 
150 
151 #undef PB_DS_CLASS_T_DEC
152 #undef PB_DS_CLASS_C_DEC
153 #undef PB_DS_BRANCH_POLICY_BASE
154 
155 } // namespace __gnu_pbds
156 
157 #endif
size_type order_of_key(key_const_reference) const
Returns the order of a key within a sequence. For exapmle, if r_key is the smallest key...
Definition: tree_policy.hpp:78
GNU extensions for policy-based data structures for public use.
const_iterator find_by_order(size_type) const
Finds an entry by __order. Returns a const_iterator to the entry with the __order order...
Definition: tree_policy.hpp:72
Primary template, base class for branch structure policies.
void operator()(node_iterator, node_const_iterator) const
Updates the rank of a node through a node_iterator node_it; end_nd_it is the end node iterator...
Functor updating ranks of entrees.
Definition: tree_policy.hpp:64