std::allocate_shared
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Déclaré dans l'en-tête <memory> | ||
template<class T, class Alloc, class... Args> shared_ptr<T> allocate_shared(const Alloc& alloc, Args... args); | ||
Construit un objet de type de
T et l'enveloppe dans un std::shared_ptr utilisant args que la liste des paramètres pour le constructeur de 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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Tout d'allocation de mémoire se fait en utilisant une copie de alloc, qui satisfait aux exigences
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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Sommaire |
[modifier]Paramètres
| alloc | - | The Allocator to use. |
| args... | - | liste des arguments avec lesquels une instance de T seront construits .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. |
[modifier]Retourne la valeur
std::shared_ptr d'une instance de
T type .Original:
std::shared_ptr of an instance of type
T.The text has been machine-translated via Google Translate.
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[modifier]Exceptions
Peut lever les exceptions levées à partir de Alloc::allocate() ou du constructeur de
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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[modifier]Notes
Cette fonction alloue de la mémoire pour l'objet T et pour le bloc de contrôle shared_ptr avec une allocation de mémoire unique. En revanche, la déclaration
std::shared_ptr<T> p(new T(Args...)) effectue deux allocations de mémoire, ce qui peut induire une surcharge inutile .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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Une copie de
alloc est stocké en tant que partie du bloc de commande de sorte qu'il peut être utilisé pour libérer une fois le nombre de références à la fois partagées et remis à zéro faible .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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[modifier]Voir aussi
Construit un nouveau shared_ptr(fonction membre publique) | |
crée un pointeur partagé qui gère un nouvel objet 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. (fonction générique) | |
