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Side by Side Diff: Source/wtf/HashTraits.h

Issue 835953003: Fix template angle bracket syntax (Closed) Base URL: https://chromium.googlesource.com/chromium/blink.git@master
Patch Set: Created 5 years, 11 months ago
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1 /* 1 /*
2 * Copyright (C) 2005, 2006, 2007, 2008, 2011, 2012 Apple Inc. All rights reserv ed. 2 * Copyright (C) 2005, 2006, 2007, 2008, 2011, 2012 Apple Inc. All rights reserv ed.
3 * 3 *
4 * This library is free software; you can redistribute it and/or 4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public 5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either 6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version. 7 * version 2 of the License, or (at your option) any later version.
8 * 8 *
9 * This library is distributed in the hope that it will be useful, 9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
(...skipping 127 matching lines...) Expand 10 before | Expand all | Expand 10 after
138 static void constructDeletedValue(P*& slot, bool) { slot = reinterpret_c ast<P*>(-1); } 138 static void constructDeletedValue(P*& slot, bool) { slot = reinterpret_c ast<P*>(-1); }
139 static bool isDeletedValue(P* value) { return value == reinterpret_cast< P*>(-1); } 139 static bool isDeletedValue(P* value) { return value == reinterpret_cast< P*>(-1); }
140 }; 140 };
141 141
142 template<typename T> struct SimpleClassHashTraits : GenericHashTraits<T> { 142 template<typename T> struct SimpleClassHashTraits : GenericHashTraits<T> {
143 static const bool emptyValueIsZero = true; 143 static const bool emptyValueIsZero = true;
144 static void constructDeletedValue(T& slot, bool) { new (NotNull, &slot) T(HashTableDeletedValue); } 144 static void constructDeletedValue(T& slot, bool) { new (NotNull, &slot) T(HashTableDeletedValue); }
145 static bool isDeletedValue(const T& value) { return value.isHashTableDel etedValue(); } 145 static bool isDeletedValue(const T& value) { return value.isHashTableDel etedValue(); }
146 }; 146 };
147 147
148 template<typename P> struct HashTraits<OwnPtr<P> > : SimpleClassHashTraits<O wnPtr<P> > { 148 template<typename P> struct HashTraits<OwnPtr<P>> : SimpleClassHashTraits<Ow nPtr<P>> {
149 typedef std::nullptr_t EmptyValueType; 149 typedef std::nullptr_t EmptyValueType;
150 150
151 static EmptyValueType emptyValue() { return nullptr; } 151 static EmptyValueType emptyValue() { return nullptr; }
152 152
153 static const bool hasIsEmptyValueFunction = true; 153 static const bool hasIsEmptyValueFunction = true;
154 static bool isEmptyValue(const OwnPtr<P>& value) { return !value; } 154 static bool isEmptyValue(const OwnPtr<P>& value) { return !value; }
155 155
156 typedef typename OwnPtr<P>::PtrType PeekInType; 156 typedef typename OwnPtr<P>::PtrType PeekInType;
157 157
158 typedef PassOwnPtr<P> PassInType; 158 typedef PassOwnPtr<P> PassInType;
159 static void store(PassOwnPtr<P> value, OwnPtr<P>& storage) { storage = v alue; } 159 static void store(PassOwnPtr<P> value, OwnPtr<P>& storage) { storage = v alue; }
160 160
161 typedef PassOwnPtr<P> PassOutType; 161 typedef PassOwnPtr<P> PassOutType;
162 static PassOwnPtr<P> passOut(OwnPtr<P>& value) { return value.release(); } 162 static PassOwnPtr<P> passOut(OwnPtr<P>& value) { return value.release(); }
163 static PassOwnPtr<P> passOut(std::nullptr_t) { return nullptr; } 163 static PassOwnPtr<P> passOut(std::nullptr_t) { return nullptr; }
164 164
165 typedef typename OwnPtr<P>::PtrType PeekOutType; 165 typedef typename OwnPtr<P>::PtrType PeekOutType;
166 static PeekOutType peek(const OwnPtr<P>& value) { return value.get(); } 166 static PeekOutType peek(const OwnPtr<P>& value) { return value.get(); }
167 static PeekOutType peek(std::nullptr_t) { return 0; } 167 static PeekOutType peek(std::nullptr_t) { return 0; }
168 }; 168 };
169 169
170 template<typename P> struct HashTraits<RefPtr<P> > : SimpleClassHashTraits<R efPtr<P> > { 170 template<typename P> struct HashTraits<RefPtr<P>> : SimpleClassHashTraits<Re fPtr<P>> {
171 typedef std::nullptr_t EmptyValueType; 171 typedef std::nullptr_t EmptyValueType;
172 static EmptyValueType emptyValue() { return nullptr; } 172 static EmptyValueType emptyValue() { return nullptr; }
173 173
174 static const bool hasIsEmptyValueFunction = true; 174 static const bool hasIsEmptyValueFunction = true;
175 static bool isEmptyValue(const RefPtr<P>& value) { return !value; } 175 static bool isEmptyValue(const RefPtr<P>& value) { return !value; }
176 176
177 typedef RefPtrValuePeeker<P> PeekInType; 177 typedef RefPtrValuePeeker<P> PeekInType;
178 typedef RefPtr<P>* IteratorGetType; 178 typedef RefPtr<P>* IteratorGetType;
179 typedef const RefPtr<P>* IteratorConstGetType; 179 typedef const RefPtr<P>* IteratorConstGetType;
180 typedef RefPtr<P>& IteratorReferenceType; 180 typedef RefPtr<P>& IteratorReferenceType;
181 typedef const RefPtr<P>& IteratorConstReferenceType; 181 typedef const RefPtr<P>& IteratorConstReferenceType;
182 static IteratorReferenceType getToReferenceConversion(IteratorGetType x) { return *x; } 182 static IteratorReferenceType getToReferenceConversion(IteratorGetType x) { return *x; }
183 static IteratorConstReferenceType getToReferenceConstConversion(Iterator ConstGetType x) { return *x; } 183 static IteratorConstReferenceType getToReferenceConstConversion(Iterator ConstGetType x) { return *x; }
184 184
185 typedef PassRefPtr<P> PassInType; 185 typedef PassRefPtr<P> PassInType;
186 static void store(PassRefPtr<P> value, RefPtr<P>& storage) { storage = v alue; } 186 static void store(PassRefPtr<P> value, RefPtr<P>& storage) { storage = v alue; }
187 187
188 typedef PassRefPtr<P> PassOutType; 188 typedef PassRefPtr<P> PassOutType;
189 static PassOutType passOut(RefPtr<P>& value) { return value.release(); } 189 static PassOutType passOut(RefPtr<P>& value) { return value.release(); }
190 static PassOutType passOut(std::nullptr_t) { return nullptr; } 190 static PassOutType passOut(std::nullptr_t) { return nullptr; }
191 191
192 typedef P* PeekOutType; 192 typedef P* PeekOutType;
193 static PeekOutType peek(const RefPtr<P>& value) { return value.get(); } 193 static PeekOutType peek(const RefPtr<P>& value) { return value.get(); }
194 static PeekOutType peek(std::nullptr_t) { return 0; } 194 static PeekOutType peek(std::nullptr_t) { return 0; }
195 }; 195 };
196 196
197 template<typename T> struct HashTraits<RawPtr<T> > : HashTraits<T*> { }; 197 template<typename T> struct HashTraits<RawPtr<T>> : HashTraits<T*> { };
198 198
199 template<> struct HashTraits<String> : SimpleClassHashTraits<String> { 199 template<> struct HashTraits<String> : SimpleClassHashTraits<String> {
200 static const bool hasIsEmptyValueFunction = true; 200 static const bool hasIsEmptyValueFunction = true;
201 static bool isEmptyValue(const String&); 201 static bool isEmptyValue(const String&);
202 }; 202 };
203 203
204 // This struct template is an implementation detail of the isHashTraitsEmpty Value function, 204 // This struct template is an implementation detail of the isHashTraitsEmpty Value function,
205 // which selects either the emptyValue function or the isEmptyValue function to check for empty values. 205 // which selects either the emptyValue function or the isEmptyValue function to check for empty values.
206 template<typename Traits, bool hasEmptyValueFunction> struct HashTraitsEmpty ValueChecker; 206 template<typename Traits, bool hasEmptyValueFunction> struct HashTraitsEmpty ValueChecker;
207 template<typename Traits> struct HashTraitsEmptyValueChecker<Traits, true> { 207 template<typename Traits> struct HashTraitsEmptyValueChecker<Traits, true> {
208 template<typename T> static bool isEmptyValue(const T& value) { return T raits::isEmptyValue(value); } 208 template<typename T> static bool isEmptyValue(const T& value) { return T raits::isEmptyValue(value); }
209 }; 209 };
210 template<typename Traits> struct HashTraitsEmptyValueChecker<Traits, false> { 210 template<typename Traits> struct HashTraitsEmptyValueChecker<Traits, false> {
211 template<typename T> static bool isEmptyValue(const T& value) { return v alue == Traits::emptyValue(); } 211 template<typename T> static bool isEmptyValue(const T& value) { return v alue == Traits::emptyValue(); }
212 }; 212 };
213 template<typename Traits, typename T> inline bool isHashTraitsEmptyValue(con st T& value) 213 template<typename Traits, typename T> inline bool isHashTraitsEmptyValue(con st T& value)
214 { 214 {
215 return HashTraitsEmptyValueChecker<Traits, Traits::hasIsEmptyValueFuncti on>::isEmptyValue(value); 215 return HashTraitsEmptyValueChecker<Traits, Traits::hasIsEmptyValueFuncti on>::isEmptyValue(value);
216 } 216 }
217 217
218 template<typename FirstTraitsArg, typename SecondTraitsArg> 218 template<typename FirstTraitsArg, typename SecondTraitsArg>
219 struct PairHashTraits : GenericHashTraits<std::pair<typename FirstTraitsArg: :TraitType, typename SecondTraitsArg::TraitType> > { 219 struct PairHashTraits : GenericHashTraits<std::pair<typename FirstTraitsArg: :TraitType, typename SecondTraitsArg::TraitType>> {
220 typedef FirstTraitsArg FirstTraits; 220 typedef FirstTraitsArg FirstTraits;
221 typedef SecondTraitsArg SecondTraits; 221 typedef SecondTraitsArg SecondTraits;
222 typedef std::pair<typename FirstTraits::TraitType, typename SecondTraits ::TraitType> TraitType; 222 typedef std::pair<typename FirstTraits::TraitType, typename SecondTraits ::TraitType> TraitType;
223 typedef std::pair<typename FirstTraits::EmptyValueType, typename SecondT raits::EmptyValueType> EmptyValueType; 223 typedef std::pair<typename FirstTraits::EmptyValueType, typename SecondT raits::EmptyValueType> EmptyValueType;
224 224
225 static const bool emptyValueIsZero = FirstTraits::emptyValueIsZero && Se condTraits::emptyValueIsZero; 225 static const bool emptyValueIsZero = FirstTraits::emptyValueIsZero && Se condTraits::emptyValueIsZero;
226 static EmptyValueType emptyValue() { return std::make_pair(FirstTraits:: emptyValue(), SecondTraits::emptyValue()); } 226 static EmptyValueType emptyValue() { return std::make_pair(FirstTraits:: emptyValue(), SecondTraits::emptyValue()); }
227 227
228 static const bool needsDestruction = FirstTraits::needsDestruction || Se condTraits::needsDestruction; 228 static const bool needsDestruction = FirstTraits::needsDestruction || Se condTraits::needsDestruction;
229 229
(...skipping 10 matching lines...) Expand all
240 // zeroing must hold as they did at the initial allocation. 240 // zeroing must hold as they did at the initial allocation.
241 // Therefore we zero the value part of the slot here for GC 241 // Therefore we zero the value part of the slot here for GC
242 // collections. 242 // collections.
243 if (zeroValue) 243 if (zeroValue)
244 memset(reinterpret_cast<void*>(&slot.second), 0, sizeof(slot.sec ond)); 244 memset(reinterpret_cast<void*>(&slot.second), 0, sizeof(slot.sec ond));
245 } 245 }
246 static bool isDeletedValue(const TraitType& value) { return FirstTraits: :isDeletedValue(value.first); } 246 static bool isDeletedValue(const TraitType& value) { return FirstTraits: :isDeletedValue(value.first); }
247 }; 247 };
248 248
249 template<typename First, typename Second> 249 template<typename First, typename Second>
250 struct HashTraits<std::pair<First, Second> > : public PairHashTraits<HashTra its<First>, HashTraits<Second> > { }; 250 struct HashTraits<std::pair<First, Second>> : public PairHashTraits<HashTrai ts<First>, HashTraits<Second>> { };
251 251
252 template<typename KeyTypeArg, typename ValueTypeArg> 252 template<typename KeyTypeArg, typename ValueTypeArg>
253 struct KeyValuePair { 253 struct KeyValuePair {
254 typedef KeyTypeArg KeyType; 254 typedef KeyTypeArg KeyType;
255 255
256 KeyValuePair(const KeyTypeArg& _key, const ValueTypeArg& _value) 256 KeyValuePair(const KeyTypeArg& _key, const ValueTypeArg& _value)
257 : key(_key) 257 : key(_key)
258 , value(_value) 258 , value(_value)
259 { 259 {
260 } 260 }
261 261
262 template <typename OtherKeyType, typename OtherValueType> 262 template <typename OtherKeyType, typename OtherValueType>
263 KeyValuePair(const KeyValuePair<OtherKeyType, OtherValueType>& other) 263 KeyValuePair(const KeyValuePair<OtherKeyType, OtherValueType>& other)
264 : key(other.key) 264 : key(other.key)
265 , value(other.value) 265 , value(other.value)
266 { 266 {
267 } 267 }
268 268
269 KeyTypeArg key; 269 KeyTypeArg key;
270 ValueTypeArg value; 270 ValueTypeArg value;
271 }; 271 };
272 272
273 template<typename KeyTraitsArg, typename ValueTraitsArg> 273 template<typename KeyTraitsArg, typename ValueTraitsArg>
274 struct KeyValuePairHashTraits : GenericHashTraits<KeyValuePair<typename KeyT raitsArg::TraitType, typename ValueTraitsArg::TraitType> > { 274 struct KeyValuePairHashTraits : GenericHashTraits<KeyValuePair<typename KeyT raitsArg::TraitType, typename ValueTraitsArg::TraitType>> {
275 typedef KeyTraitsArg KeyTraits; 275 typedef KeyTraitsArg KeyTraits;
276 typedef ValueTraitsArg ValueTraits; 276 typedef ValueTraitsArg ValueTraits;
277 typedef KeyValuePair<typename KeyTraits::TraitType, typename ValueTraits ::TraitType> TraitType; 277 typedef KeyValuePair<typename KeyTraits::TraitType, typename ValueTraits ::TraitType> TraitType;
278 typedef KeyValuePair<typename KeyTraits::EmptyValueType, typename ValueT raits::EmptyValueType> EmptyValueType; 278 typedef KeyValuePair<typename KeyTraits::EmptyValueType, typename ValueT raits::EmptyValueType> EmptyValueType;
279 279
280 static const bool emptyValueIsZero = KeyTraits::emptyValueIsZero && Valu eTraits::emptyValueIsZero; 280 static const bool emptyValueIsZero = KeyTraits::emptyValueIsZero && Valu eTraits::emptyValueIsZero;
281 static EmptyValueType emptyValue() { return KeyValuePair<typename KeyTra its::EmptyValueType, typename ValueTraits::EmptyValueType>(KeyTraits::emptyValue (), ValueTraits::emptyValue()); } 281 static EmptyValueType emptyValue() { return KeyValuePair<typename KeyTra its::EmptyValueType, typename ValueTraits::EmptyValueType>(KeyTraits::emptyValue (), ValueTraits::emptyValue()); }
282 282
283 static const bool needsDestruction = KeyTraits::needsDestruction || Valu eTraits::needsDestruction; 283 static const bool needsDestruction = KeyTraits::needsDestruction || Valu eTraits::needsDestruction;
284 template<typename U = void> 284 template<typename U = void>
285 struct NeedsTracingLazily { 285 struct NeedsTracingLazily {
286 static const bool value = ShouldBeTraced<KeyTraits>::value || Should BeTraced<ValueTraits>::value; 286 static const bool value = ShouldBeTraced<KeyTraits>::value || Should BeTraced<ValueTraits>::value;
287 }; 287 };
288 static const WeakHandlingFlag weakHandlingFlag = (KeyTraits::weakHandlin gFlag == WeakHandlingInCollections || ValueTraits::weakHandlingFlag == WeakHandl ingInCollections) ? WeakHandlingInCollections : NoWeakHandlingInCollections; 288 static const WeakHandlingFlag weakHandlingFlag = (KeyTraits::weakHandlin gFlag == WeakHandlingInCollections || ValueTraits::weakHandlingFlag == WeakHandl ingInCollections) ? WeakHandlingInCollections : NoWeakHandlingInCollections;
289 289
290 static const unsigned minimumTableSize = KeyTraits::minimumTableSize; 290 static const unsigned minimumTableSize = KeyTraits::minimumTableSize;
291 291
292 static void constructDeletedValue(TraitType& slot, bool zeroValue) 292 static void constructDeletedValue(TraitType& slot, bool zeroValue)
293 { 293 {
294 KeyTraits::constructDeletedValue(slot.key, zeroValue); 294 KeyTraits::constructDeletedValue(slot.key, zeroValue);
295 // See similar code in this file for why we need to do this. 295 // See similar code in this file for why we need to do this.
296 if (zeroValue) 296 if (zeroValue)
297 memset(reinterpret_cast<void*>(&slot.value), 0, sizeof(slot.valu e)); 297 memset(reinterpret_cast<void*>(&slot.value), 0, sizeof(slot.valu e));
298 } 298 }
299 static bool isDeletedValue(const TraitType& value) { return KeyTraits::i sDeletedValue(value.key); } 299 static bool isDeletedValue(const TraitType& value) { return KeyTraits::i sDeletedValue(value.key); }
300 }; 300 };
301 301
302 template<typename Key, typename Value> 302 template<typename Key, typename Value>
303 struct HashTraits<KeyValuePair<Key, Value> > : public KeyValuePairHashTraits <HashTraits<Key>, HashTraits<Value> > { }; 303 struct HashTraits<KeyValuePair<Key, Value>> : public KeyValuePairHashTraits< HashTraits<Key>, HashTraits<Value>> { };
304 304
305 template<typename T> 305 template<typename T>
306 struct NullableHashTraits : public HashTraits<T> { 306 struct NullableHashTraits : public HashTraits<T> {
307 static const bool emptyValueIsZero = false; 307 static const bool emptyValueIsZero = false;
308 static T emptyValue() { return reinterpret_cast<T>(1); } 308 static T emptyValue() { return reinterpret_cast<T>(1); }
309 }; 309 };
310 310
311 // This is for tracing inside collections that have special support for weak 311 // This is for tracing inside collections that have special support for weak
312 // pointers. The trait has a trace method which returns true if there are we ak 312 // pointers. The trait has a trace method which returns true if there are we ak
313 // pointers to things that have not (yet) been marked live. Returning true 313 // pointers to things that have not (yet) been marked live. Returning true
314 // indicates that the entry in the collection may yet be removed by weak 314 // indicates that the entry in the collection may yet be removed by weak
315 // handling. Default implementation for non-weak types is to use the regular 315 // handling. Default implementation for non-weak types is to use the regular
316 // non-weak TraceTrait. Default implementation for types with weakness is to 316 // non-weak TraceTrait. Default implementation for types with weakness is to
317 // call traceInCollection on the type's trait. 317 // call traceInCollection on the type's trait.
318 template<WeakHandlingFlag weakHandlingFlag, ShouldWeakPointersBeMarkedStrong ly strongify, typename T, typename Traits> 318 template<WeakHandlingFlag weakHandlingFlag, ShouldWeakPointersBeMarkedStrong ly strongify, typename T, typename Traits>
319 struct TraceInCollectionTrait; 319 struct TraceInCollectionTrait;
320 320
321 } // namespace WTF 321 } // namespace WTF
322 322
323 using WTF::HashTraits; 323 using WTF::HashTraits;
324 using WTF::PairHashTraits; 324 using WTF::PairHashTraits;
325 using WTF::NullableHashTraits; 325 using WTF::NullableHashTraits;
326 using WTF::SimpleClassHashTraits; 326 using WTF::SimpleClassHashTraits;
327 327
328 #endif // WTF_HashTraits_h 328 #endif // WTF_HashTraits_h
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