std::allocate_shared
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| Заголовочный файл <memory>
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| template< class T, class Alloc, class... Args > shared_ptr<T> allocate_shared( const Alloc& alloc, Args... args ); |
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Создает объект типа
T и оборачивает его в std::shared_ptr использованием args как список параметров для конструктора T.Original:
Constructs an object of type
T and wraps it in a std::shared_ptr using args as the parameter list for the constructor of T.The text has been machine-translated via Google Translate.
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Все распределения памяти осуществляется с помощью копии alloc, которая удовлетворяет требованиям
Allocator.Original:
All memory allocation is done using a copy of alloc, which satisfies the
Allocator requirements.The text has been machine-translated via Google Translate.
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Содержание |
[править] Параметры
| alloc | - | The Allocator to use.
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| args... | - | Список аргументов, с которыми экземпляр
T будет построен .Original: list of arguments with which an instance of T will be constructed.The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
[править] Возвращаемое значение
std::shared_ptr экземпляра типа
T.Original:
std::shared_ptr of an instance of type
T.The text has been machine-translated via Google Translate.
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[править] Исключения
Можете бросить исключения из Alloc::allocate() или из конструктора
T.Original:
Can throw the exceptions thrown from Alloc::allocate() or from the constructor of
T.The text has been machine-translated via Google Translate.
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[править] Notes
Эта функция выделяет память для T объекта и для блока управления shared_ptr с одной распределения памяти. В отличие от декларации
std::shared_ptr<T> p(new T(Args...)) выполняет две выделения памяти, которая может понести ненужные накладные расходы.Original:
This function allocates memory for the T object and for the shared_ptr's control block with a single memory allocation. In contrast, the declaration
std::shared_ptr<T> p(new T(Args...)) performs two memory allocations, which may incur unnecessary overhead.The text has been machine-translated via Google Translate.
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Копия
alloc сохраняется как часть блока управления, так что она может быть использована для освобождения его один раз как общие, так и слабые счетчик ссылок достигает нуля.Original:
A copy of
alloc is stored as part of the control block so that it can be used to deallocate it once both shared and weak reference counts reach zero.The text has been machine-translated via Google Translate.
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[править] См. также
constructs new shared_ptr (public функция-член) | |
| создает общий указатель, который управляет новый объект Original: creates a shared pointer that manages a new object The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (шаблон функции) | |