1 | // Copyright (C) 2015 ChaosForge Ltd
|
---|
2 | // http://chaosforge.org/
|
---|
3 | //
|
---|
4 | // This file is part of Nova libraries.
|
---|
5 | // For conditions of distribution and use, see copying.txt file in root folder.
|
---|
6 |
|
---|
7 | /**
|
---|
8 | * @file unordered_map.hh
|
---|
9 | * @author Kornel Kisielewicz epyon@chaosforge.org
|
---|
10 | * @brief unordered_map
|
---|
11 | */
|
---|
12 |
|
---|
13 | #ifndef NV_STL_UNORDERED_MAP_HH
|
---|
14 | #define NV_STL_UNORDERED_MAP_HH
|
---|
15 |
|
---|
16 | #include <nv/common.hh>
|
---|
17 | #include <nv/stl/container/hash_table.hh>
|
---|
18 | #include <nv/stl/utility/pair.hh>
|
---|
19 | #include <nv/stl/functional/hash.hh>
|
---|
20 | #include <nv/stl/functional/comparisons.hh>
|
---|
21 | #include <nv/stl/memory.hh>
|
---|
22 |
|
---|
23 | namespace nv
|
---|
24 | {
|
---|
25 |
|
---|
26 | template <
|
---|
27 | typename T,
|
---|
28 | typename IsEqual = equal_to<T>,
|
---|
29 | bool IsEmpty = is_empty< IsEqual >::value
|
---|
30 | >
|
---|
31 | struct compare_policy;
|
---|
32 |
|
---|
33 |
|
---|
34 | template < typename T >
|
---|
35 | struct compare_policy< T, equal_to<T>, true >
|
---|
36 | {
|
---|
37 | constexpr bool compare( const T& t1, const T& t2 ) const
|
---|
38 | {
|
---|
39 | return t1 == t2;
|
---|
40 | }
|
---|
41 | equal_to<T> key_eq() const { return equal_to<T>(); }
|
---|
42 | };
|
---|
43 |
|
---|
44 | template < typename T, typename IsEqual >
|
---|
45 | struct compare_policy< T, IsEqual, true > : private IsEqual
|
---|
46 | {
|
---|
47 | constexpr bool compare( const T& t1, const T& t2 ) const
|
---|
48 | {
|
---|
49 | return ( *this )( t1 == t2 );
|
---|
50 | }
|
---|
51 | IsEqual key_eq() const { return ( *this ); }
|
---|
52 | };
|
---|
53 |
|
---|
54 | template < typename T, typename IsEqual >
|
---|
55 | struct compare_policy< T, IsEqual, false >
|
---|
56 | {
|
---|
57 | constexpr bool compare( const T& t1, const T& t2 ) const
|
---|
58 | {
|
---|
59 | return m_key_eq( t1 == t2 );
|
---|
60 | }
|
---|
61 | IsEqual key_eq() const { return m_key_eq; }
|
---|
62 | private:
|
---|
63 | IsEqual m_key_eq;
|
---|
64 | };
|
---|
65 |
|
---|
66 | template <
|
---|
67 | typename T,
|
---|
68 | typename H,
|
---|
69 | typename Hasher = hash< T, H >,
|
---|
70 | bool IsEmpty = is_empty< Hasher >::value
|
---|
71 | >
|
---|
72 | struct hash_policy;
|
---|
73 |
|
---|
74 |
|
---|
75 | template < typename T, typename H >
|
---|
76 | struct hash_policy< T, H, hash< T, H >, true >
|
---|
77 | {
|
---|
78 | constexpr H get_hash( const T& t ) const
|
---|
79 | {
|
---|
80 | return hash< T, H >::get( t );
|
---|
81 | }
|
---|
82 | hash< T, H > hash_function() const { return hash< T, H >(); }
|
---|
83 | };
|
---|
84 |
|
---|
85 | template < typename T, typename H, typename Hasher >
|
---|
86 | struct hash_policy< T, H, Hasher, true > : private Hasher
|
---|
87 | {
|
---|
88 | constexpr H get_hash( const T& t ) const
|
---|
89 | {
|
---|
90 | return ( *this )( t );
|
---|
91 | }
|
---|
92 | hash< T, H > hash_function() const { return ( *this ); }
|
---|
93 | };
|
---|
94 |
|
---|
95 | template < typename T, typename H, typename Hasher >
|
---|
96 | struct hash_policy< T, H, Hasher, false >
|
---|
97 | {
|
---|
98 | constexpr H get_hash( const T& t ) const
|
---|
99 | {
|
---|
100 | return m_hasher( t );
|
---|
101 | }
|
---|
102 | hash< T, H > hash_function() const { return m_hasher; }
|
---|
103 | private:
|
---|
104 | Hasher m_hasher;
|
---|
105 | };
|
---|
106 |
|
---|
107 | // Due to MSVC not being able to handle multiple empty bases, if both
|
---|
108 | // hash and compare are empty, we will still get a 4-size structure.
|
---|
109 | // We will optimize here, to assure that if either is empty, we will still
|
---|
110 | // get an empty class
|
---|
111 | template <
|
---|
112 | typename T,
|
---|
113 | typename H,
|
---|
114 | typename IsEqual = equal_to< T >,
|
---|
115 | typename Hasher = hash< T, H >,
|
---|
116 | bool IsEqualIsEmpty = is_empty< IsEqual >::value,
|
---|
117 | bool HasherIsEmpty = is_empty< Hasher >::value
|
---|
118 | >
|
---|
119 | struct hash_compare_policy;
|
---|
120 |
|
---|
121 | template <
|
---|
122 | typename T,
|
---|
123 | typename H,
|
---|
124 | typename IsEqual,
|
---|
125 | typename Hasher,
|
---|
126 | bool HasherIsEmpty
|
---|
127 | >
|
---|
128 | struct hash_compare_policy< T, H, IsEqual, Hasher, false, HasherIsEmpty >
|
---|
129 | : hash_policy< T, H, Hasher, HasherIsEmpty >
|
---|
130 | {
|
---|
131 | constexpr bool compare( const T& t1, const T& t2 ) const
|
---|
132 | {
|
---|
133 | return m_key_eq( t1 == t2 );
|
---|
134 | }
|
---|
135 | IsEqual key_eq() const { return m_key_eq; }
|
---|
136 | private:
|
---|
137 | IsEqual m_key_eq;
|
---|
138 | };
|
---|
139 |
|
---|
140 | template <
|
---|
141 | typename T,
|
---|
142 | typename H,
|
---|
143 | typename IsEqual,
|
---|
144 | typename Hasher
|
---|
145 | >
|
---|
146 | struct hash_compare_policy< T, H, IsEqual, Hasher, true, false >
|
---|
147 | : compare_policy< T, IsEqual, true >
|
---|
148 | {
|
---|
149 | constexpr H get_hash( const T& t ) const
|
---|
150 | {
|
---|
151 | return m_hasher( t );
|
---|
152 | }
|
---|
153 | hash< T, H > hash_function() const { return m_hasher; }
|
---|
154 | private:
|
---|
155 | Hasher m_hasher;
|
---|
156 | };
|
---|
157 |
|
---|
158 | template <
|
---|
159 | typename T,
|
---|
160 | typename H,
|
---|
161 | typename Hasher,
|
---|
162 | typename IsEqual
|
---|
163 | >
|
---|
164 | struct hash_compare_policy< T, H, IsEqual, Hasher, true, true >
|
---|
165 | : hash_policy< T, H, Hasher, true >
|
---|
166 | {
|
---|
167 | constexpr bool compare( const T& t1, const T& t2 ) const
|
---|
168 | {
|
---|
169 | static_assert( is_trivial< IsEqual >::value, "There is something really wrong with your equality functor." );
|
---|
170 | return IsEqual()( t1, t2 );
|
---|
171 | }
|
---|
172 | IsEqual key_eq() const { return IsEqual(); }
|
---|
173 | };
|
---|
174 |
|
---|
175 | template <
|
---|
176 | typename Key,
|
---|
177 | typename Value,
|
---|
178 | typename Hash,
|
---|
179 | typename IsEqual = equal_to< Key >,
|
---|
180 | typename Hasher = hash< Key, Hash >
|
---|
181 | >
|
---|
182 | struct hash_table_stl_map_policy : hash_compare_policy< Key, Hash, IsEqual, Hasher >
|
---|
183 | {
|
---|
184 | typedef hash_compare_policy< Key, Hash, IsEqual, Hasher > base_type;
|
---|
185 |
|
---|
186 | typedef hash_table_standard_entry< Key, Value, Hash, false > entry_type;
|
---|
187 | typedef typename entry_type::key_type key_type;
|
---|
188 | typedef typename entry_type::mapped_type mapped_type;
|
---|
189 | typedef typename entry_type::hash_type hash_type;
|
---|
190 | typedef typename entry_type::value_type value_type;
|
---|
191 | typedef Key query_type;
|
---|
192 |
|
---|
193 | constexpr bool entry_compare( const entry_type* entry, hash_type, const query_type& key ) const
|
---|
194 | {
|
---|
195 | return base_type::compare( entry_type::get_key( entry ), key );
|
---|
196 | }
|
---|
197 |
|
---|
198 | constexpr bool entry_compare( const entry_type* entry, hash_type, const value_type& value ) const
|
---|
199 | {
|
---|
200 | return base_type::compare( entry_type::get_key( entry ), entry_type::get_key( value ) );
|
---|
201 | }
|
---|
202 |
|
---|
203 | template < typename... Args >
|
---|
204 | static void entry_construct( entry_type* entry, hash_type, Args&&... params )
|
---|
205 | {
|
---|
206 | construct_object( entry_type::get_value( entry ), ::nv::forward<Args>( params )... );
|
---|
207 | }
|
---|
208 |
|
---|
209 | static void entry_destroy( entry_type* entry )
|
---|
210 | {
|
---|
211 | destroy_object( entry_type::get_value( entry ) );
|
---|
212 | }
|
---|
213 |
|
---|
214 | constexpr hash_type get_entry_hash( const entry_type* entry ) const
|
---|
215 | {
|
---|
216 | return base_type::get_hash( entry_type::get_key( entry ) );
|
---|
217 | }
|
---|
218 | constexpr hash_type get_value_hash( const value_type& value ) const
|
---|
219 | {
|
---|
220 | return base_type::get_hash( entry_type::get_key( value ) );
|
---|
221 | }
|
---|
222 | };
|
---|
223 |
|
---|
224 | template <
|
---|
225 | typename Key,
|
---|
226 | typename T,
|
---|
227 | typename Hash = hash< Key >,
|
---|
228 | typename KeyEqual = equal_to< Key >,
|
---|
229 | typename HashEntryPolicy = hash_table_stl_map_policy< Key, T, typename Hash::result_type, KeyEqual, Hash >
|
---|
230 | >
|
---|
231 | class unordered_map
|
---|
232 | : public hash_table_base<
|
---|
233 | HashEntryPolicy,
|
---|
234 | hash_table_no_extra_types_policy,
|
---|
235 | hash_table_prime_rehash_policy,
|
---|
236 | HashEntryPolicy
|
---|
237 | >
|
---|
238 | {
|
---|
239 | public:
|
---|
240 | typedef hash_table_base<
|
---|
241 | HashEntryPolicy,
|
---|
242 | hash_table_no_extra_types_policy,
|
---|
243 | hash_table_prime_rehash_policy,
|
---|
244 | HashEntryPolicy
|
---|
245 | > base_type;
|
---|
246 | typedef typename base_type::value_type value_type;
|
---|
247 | typedef typename base_type::pointer pointer;
|
---|
248 | typedef typename base_type::const_pointer const_pointer;
|
---|
249 | typedef typename base_type::reference reference;
|
---|
250 | typedef typename base_type::const_reference const_reference;
|
---|
251 | typedef typename base_type::iterator iterator;
|
---|
252 | typedef typename base_type::const_iterator const_iterator;
|
---|
253 | typedef typename base_type::size_type size_type;
|
---|
254 | typedef typename base_type::difference_type difference_type;
|
---|
255 | typedef typename base_type::key_type key_type;
|
---|
256 | typedef typename base_type::mapped_type mapped_type;
|
---|
257 | typedef typename base_type::node_type node_type;
|
---|
258 | typedef typename base_type::insert_return_type insert_return_type;
|
---|
259 | typedef Hash hasher;
|
---|
260 | typedef KeyEqual key_equal;
|
---|
261 |
|
---|
262 | using base_type::base_type;
|
---|
263 |
|
---|
264 | mapped_type& operator[]( const key_type& key )
|
---|
265 | {
|
---|
266 | return ( *base_type::insert_key( key ).first ).second;
|
---|
267 | }
|
---|
268 |
|
---|
269 | mapped_type& at( const key_type& key )
|
---|
270 | {
|
---|
271 | iterator it = base_type::find( key );
|
---|
272 | NV_ASSERT_ALWAYS( it != base_type::end(), "Key not found in map!" );
|
---|
273 | return *it;
|
---|
274 | }
|
---|
275 |
|
---|
276 | const mapped_type& at( const key_type& key ) const
|
---|
277 | {
|
---|
278 | const_iterator it = base_type::find( key );
|
---|
279 | NV_ASSERT_ALWAYS( it != base_type::cend(), "Key not found in map!" );
|
---|
280 | return *it;
|
---|
281 | }
|
---|
282 |
|
---|
283 | size_type count( const key_type& key ) const
|
---|
284 | {
|
---|
285 | return base_type::find( key ) == base_type::cend() ? 0 : 1;
|
---|
286 | }
|
---|
287 |
|
---|
288 | pair<iterator, iterator> equal_range( const key_type& key )
|
---|
289 | {
|
---|
290 | iterator it = base_type::find( key );
|
---|
291 | return pair<iterator, iterator>( it, it == base_type::end() ? it : ++it );
|
---|
292 | }
|
---|
293 |
|
---|
294 | pair<const_iterator, const_iterator> equal_range( const key_type& key ) const
|
---|
295 | {
|
---|
296 | const_iterator it = base_type::find( key );
|
---|
297 | return pair<const_iterator, const_iterator>( it, it == base_type::cend() ? it : ++it );
|
---|
298 | }
|
---|
299 |
|
---|
300 | using base_type::insert;
|
---|
301 |
|
---|
302 | template < typename M >
|
---|
303 | insert_return_type insert_or_assign( const key_type& k, M&& obj )
|
---|
304 | {
|
---|
305 | insert_return_type result = base_type::try_insert( k, nv::forward<M>( obj ) );
|
---|
306 | if ( !result.second ) result.first->second = obj;
|
---|
307 | return result;
|
---|
308 | }
|
---|
309 |
|
---|
310 | template < typename M >
|
---|
311 | insert_return_type insert_or_assign( key_type&& k, M&& obj )
|
---|
312 | {
|
---|
313 | insert_return_type result = base_type::try_insert( nv::forward<key_type>( k ), nv::forward<M>( obj ) );
|
---|
314 | if ( !result.second ) result.first->second = obj;
|
---|
315 | return result;
|
---|
316 | }
|
---|
317 |
|
---|
318 | // STL compatibility only, hint unused
|
---|
319 | iterator insert( const_iterator, const value_type& value )
|
---|
320 | {
|
---|
321 | return base_type::insert( value ).first;
|
---|
322 | }
|
---|
323 |
|
---|
324 | };
|
---|
325 |
|
---|
326 | }
|
---|
327 |
|
---|
328 | #endif // NV_STL_UNORDERED_MAP_HH
|
---|
329 |
|
---|