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Side by Side Diff: base/values.h

Issue 2843783003: Expose Value::GetList and Value(ListStorage) on ListValue (Closed)
Patch Set: Created 3 years, 7 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 // This file specifies a recursive data storage class called Value intended for 5 // This file specifies a recursive data storage class called Value intended for
6 // storing settings and other persistable data. 6 // storing settings and other persistable data.
7 // 7 //
8 // A Value represents something that can be stored in JSON or passed to/from 8 // A Value represents something that can be stored in JSON or passed to/from
9 // JavaScript. As such, it is NOT a generalized variant type, since only the 9 // JavaScript. As such, it is NOT a generalized variant type, since only the
10 // types supported by JavaScript/JSON are supported. 10 // types supported by JavaScript/JSON are supported.
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376 // This type of Value represents a list of other Value values. 376 // This type of Value represents a list of other Value values.
377 class BASE_EXPORT ListValue : public Value { 377 class BASE_EXPORT ListValue : public Value {
378 public: 378 public:
379 using const_iterator = ListStorage::const_iterator; 379 using const_iterator = ListStorage::const_iterator;
380 using iterator = ListStorage::iterator; 380 using iterator = ListStorage::iterator;
381 381
382 // Returns |value| if it is a list, nullptr otherwise. 382 // Returns |value| if it is a list, nullptr otherwise.
383 static std::unique_ptr<ListValue> From(std::unique_ptr<Value> value); 383 static std::unique_ptr<ListValue> From(std::unique_ptr<Value> value);
384 384
385 ListValue(); 385 ListValue();
386 explicit ListValue(const ListStorage& in_list);
387 explicit ListValue(ListStorage&& in_list) noexcept;
386 388
387 // Clears the contents of this ListValue 389 // Clears the contents of this ListValue
388 void Clear(); 390 void Clear();
389 391
390 // Returns the number of Values in this list. 392 // Returns the number of Values in this list.
391 size_t GetSize() const { return list_->size(); } 393 size_t GetSize() const { return list_->size(); }
392 394
393 // Returns the capacity of storage for Values in this list. 395 // Returns the capacity of storage for Values in this list.
394 size_t capacity() const { return list_->capacity(); } 396 size_t capacity() const { return list_->capacity(); }
395 397
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423 bool GetInteger(size_t index, int* out_value) const; 425 bool GetInteger(size_t index, int* out_value) const;
424 // Values of both type Type::INTEGER and Type::DOUBLE can be obtained as 426 // Values of both type Type::INTEGER and Type::DOUBLE can be obtained as
425 // doubles. 427 // doubles.
426 bool GetDouble(size_t index, double* out_value) const; 428 bool GetDouble(size_t index, double* out_value) const;
427 bool GetString(size_t index, std::string* out_value) const; 429 bool GetString(size_t index, std::string* out_value) const;
428 bool GetString(size_t index, string16* out_value) const; 430 bool GetString(size_t index, string16* out_value) const;
429 bool GetBinary(size_t index, const Value** out_value) const; 431 bool GetBinary(size_t index, const Value** out_value) const;
430 bool GetBinary(size_t index, Value** out_value); 432 bool GetBinary(size_t index, Value** out_value);
431 bool GetDictionary(size_t index, const DictionaryValue** out_value) const; 433 bool GetDictionary(size_t index, const DictionaryValue** out_value) const;
432 bool GetDictionary(size_t index, DictionaryValue** out_value); 434 bool GetDictionary(size_t index, DictionaryValue** out_value);
435
436 using Value::GetList;
433 bool GetList(size_t index, const ListValue** out_value) const; 437 bool GetList(size_t index, const ListValue** out_value) const;
434 bool GetList(size_t index, ListValue** out_value); 438 bool GetList(size_t index, ListValue** out_value);
435 439
436 // Removes the Value with the specified index from this list. 440 // Removes the Value with the specified index from this list.
437 // If |out_value| is non-NULL, the removed Value AND ITS OWNERSHIP will be 441 // If |out_value| is non-NULL, the removed Value AND ITS OWNERSHIP will be
438 // passed out via |out_value|. If |out_value| is NULL, the removed value will 442 // passed out via |out_value|. If |out_value| is NULL, the removed value will
439 // be deleted. This method returns true if |index| is valid; otherwise 443 // be deleted. This method returns true if |index| is valid; otherwise
440 // it will return false and the ListValue object will be unchanged. 444 // it will return false and the ListValue object will be unchanged.
441 bool Remove(size_t index, std::unique_ptr<Value>* out_value); 445 bool Remove(size_t index, std::unique_ptr<Value>* out_value);
442 446
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534 return out << static_cast<const Value&>(value); 538 return out << static_cast<const Value&>(value);
535 } 539 }
536 540
537 // Stream operator so that enum class Types can be used in log statements. 541 // Stream operator so that enum class Types can be used in log statements.
538 BASE_EXPORT std::ostream& operator<<(std::ostream& out, 542 BASE_EXPORT std::ostream& operator<<(std::ostream& out,
539 const Value::Type& type); 543 const Value::Type& type);
540 544
541 } // namespace base 545 } // namespace base
542 546
543 #endif // BASE_VALUES_H_ 547 #endif // BASE_VALUES_H_
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