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std::allocate_shared

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< cpp‎ | memory‎ | shared ptr

 
 
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Defined in header <memory>
template< class T, class Alloc, class... Args >
shared_ptr<T> allocate_shared( const Alloc& alloc, Args... args );
Constrói um objeto do tipo T e quebra-lo em um std::shared_ptr usando args como a lista de parâmetros para o construtor 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.
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Toda a alocação de memória é feita usando uma cópia do alloc, que satisfaz os requisitos Allocator.
Original:
All memory allocation is done using a copy of alloc, which satisfies the Allocator requirements.
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Índice

[editar] Parâmetros

alloc - The Allocator to use.
args... -
lista de argumentos com que uma instância de T serão construídas .
Original:
list of arguments with which an instance of T will be constructed.
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[editar] Valor de retorno

std::shared_ptr de uma instância de T tipo.
Original:
std::shared_ptr of an instance of type T.
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[editar] Exceções

Pode lançar as exceções lançadas a partir Alloc::allocate() ou do construtor de T.
Original:
Can throw the exceptions thrown from Alloc::allocate() or from the constructor of T.
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[editar] Notas

Esta função aloca memória para o objeto T e para o bloco de controle shared_ptr com uma alocação de memória único. Em contraste, a declaração std::shared_ptr<T> p(new T(Args...)) executa duas atribuições de memória, os quais podem implicar uma sobrecarga desnecessária.
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.
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Uma cópia do alloc é armazenado como parte do bloco de controle, de modo que ele pode ser usado para desalocar uma vez contagens de referência compartilhados e fraco chegar a zero.
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.
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[editar] Veja também

constructs new shared_ptr
(função pública membro) [edit]
cria um ponteiro comum que gere um novo objeto
Original:
creates a shared pointer that manages a new object
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(modelo de função) [edit]