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std::make_shared

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< cpp‎ | memory‎ | shared ptr

 
 
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std::shared_ptr
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Defined in header <memory>
template< class T, class... Args >
shared_ptr<T> make_shared( 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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Índice

[editar] Parâmetros

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 std::bad_alloc ou qualquer exceção lançada pelo contructor de T.
Original:
May throw std::bad_alloc or any exception thrown by the contructor 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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[editar] Exemplo

#include <iostream>
#include <memory>
 
void foo(std::shared_ptr<int> i)
{
    (*i)++;
}
 
int main()
{
    auto sp = std::make_shared<int>(10);
    foo(sp);
    std::cout << *sp << std::endl;
}

Output:

11

[editar] Veja também

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