summaryrefslogtreecommitdiffstatshomepage
path: root/3rdparty/bx/include/tinystl/hash_base.h
blob: 73b5c9ebda8fc1a446db40b7f88d4ecd59266f64 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
/*-
 * Copyright 2012 Matthew Endsley
 * All rights reserved
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted providing that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef TINYSTL_HASH_BASE_H
#define TINYSTL_HASH_BASE_H

#include "stddef.h"

namespace tinystl {

	template<typename Key, typename Value>
	struct pair {
		pair();
		pair(const Key& key, const Value& value);

		Key first;
		Value second;
	};

	template<typename Key, typename Value>
	pair<Key, Value>::pair() {
	}

	template<typename Key, typename Value>
	pair<Key, Value>::pair(const Key& key, const Value& value)
		: first(key)
		, second(value)
	{
	}

	template<typename Key, typename Value>
	static inline pair<Key, Value> make_pair(const Key& key, const Value& value) {
		return pair<Key, Value>(key, value);
	}


	template<typename Key, typename Value>
	struct unordered_hash_node {
		unordered_hash_node(const Key& key, const Value& value);

		const Key first;
		Value second;
		unordered_hash_node* next;
		unordered_hash_node* prev;

	private:
		unordered_hash_node& operator=(const unordered_hash_node&);
	};

	template<typename Key, typename Value>
	unordered_hash_node<Key, Value>::unordered_hash_node(const Key& key, const Value& value)
		: first(key)
		, second(value)
	{
	}

	template <typename Key>
	struct unordered_hash_node<Key, void> {
		unordered_hash_node(const Key& key);

		const Key first;
		unordered_hash_node* next;
		unordered_hash_node* prev;

	private:
		unordered_hash_node& operator=(const unordered_hash_node&);
	};

	template<typename Key>
	unordered_hash_node<Key, void>::unordered_hash_node(const Key& key)
		: first(key)
	{
	}

	template<typename Key, typename Value>
	static void unordered_hash_node_insert(unordered_hash_node<Key, Value>* node, size_t hash, unordered_hash_node<Key, Value>** buckets, size_t nbuckets) {
		size_t bucket = hash & (nbuckets - 1);

		unordered_hash_node<Key, Value>* it = buckets[bucket + 1];
		node->next = it;
		if (it) {
			node->prev = it->prev;
			it->prev = node;
			if (node->prev)
				node->prev->next = node;
		} else {
			size_t newbucket = bucket;
			while (newbucket && !buckets[newbucket])
				--newbucket;

			unordered_hash_node<Key, Value>* prev = buckets[newbucket];
			while (prev && prev->next)
				prev = prev->next;

			node->prev = prev;
			if (prev)
				prev->next = node;
		}

		// propagate node through buckets
		for (; it == buckets[bucket]; --bucket) {
			buckets[bucket] = node;
			if (!bucket)
				break;
		}
	}

	template<typename Key, typename Value>
	static inline void unordered_hash_node_erase(const unordered_hash_node<Key, Value>* where, size_t hash, unordered_hash_node<Key, Value>** buckets, size_t nbuckets) {
		size_t bucket = hash & (nbuckets - 1);

		unordered_hash_node<Key, Value>* next = where->next;
		for (; buckets[bucket] == where; --bucket) {
			buckets[bucket] = next;
			if (!bucket)
				break;
		}

		if (where->prev)
			where->prev->next = where->next;
		if (next)
			next->prev = where->prev;
	}

	template<typename Node>
	struct unordered_hash_iterator {
		Node* operator->() const;
		Node& operator*() const;
		Node* node;
	};

	template<typename Node>
	struct unordered_hash_iterator<const Node> {

		unordered_hash_iterator() {}
		unordered_hash_iterator(unordered_hash_iterator<Node> other)
			: node(other.node)
		{
		}

		const Node* operator->() const;
		const Node& operator*() const;
		const Node* node;
	};

	template<typename Key>
	struct unordered_hash_iterator<const unordered_hash_node<Key, void> > {
		const Key* operator->() const;
		const Key& operator*() const;
		unordered_hash_node<Key, void>* node;
	};

	template<typename LNode, typename RNode>
	static inline bool operator==(const unordered_hash_iterator<LNode>& lhs, const unordered_hash_iterator<RNode>& rhs) {
		return lhs.node == rhs.node;
	}

	template<typename LNode, typename RNode>
	static inline bool operator!=(const unordered_hash_iterator<LNode>& lhs, const unordered_hash_iterator<RNode>& rhs) {
		return lhs.node != rhs.node;
	}

	template<typename Node>
	static inline void operator++(unordered_hash_iterator<Node>& lhs) {
		lhs.node = lhs.node->next;
	}

	template<typename Node>
	inline Node* unordered_hash_iterator<Node>::operator->() const {
		return node;
	}

	template<typename Node>
	inline Node& unordered_hash_iterator<Node>::operator*() const {
		return *node;
	}

	template<typename Node>
	inline const Node* unordered_hash_iterator<const Node>::operator->() const {
		return node;
	}

	template<typename Node>
	inline const Node& unordered_hash_iterator<const Node>::operator*() const {
		return *node;
	}

	template<typename Key>
	inline const Key* unordered_hash_iterator<const unordered_hash_node<Key, void> >::operator->() const {
		return &node->first;
	}

	template<typename Key>
	inline const Key& unordered_hash_iterator<const unordered_hash_node<Key, void> >::operator*() const {
		return node->first;
	}

	template<typename Node, typename Key>
	static inline Node unordered_hash_find(const Key& key, Node* buckets, size_t nbuckets) {
		const size_t bucket = hash(key) & (nbuckets - 2);
		for (Node it = buckets[bucket], end = buckets[bucket+1]; it != end; it = it->next)
			if (it->first == key)
				return it;

		return 0;
	}
}
#endif