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std::bad_weak_ptr

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std::bad_weak_ptr
Funções de membro
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bad_weak_ptr::bad_weak_ptr
 
Defined in header <memory>
class bad_weak_ptr;
(a partir do C++ 11)
std::bad_weak_ptr é o tipo do objeto lançado como exceções pelos construtores de std::shared_ptr que levam std::weak_ptr como argumento, quando o std::weak_ptr refere-se a um objeto já eliminado.
Original:
std::bad_weak_ptr is the type of the object thrown as exceptions by the constructors of std::shared_ptr that take std::weak_ptr as the argument, when the std::weak_ptr refers to an already deleted object.
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cpp/error/exceptionstd-bad weak ptr-inheritance.svg
Sobre esta imagem

Inheritance diagram

Índice

[editar] Funções de membro

constrói o objeto bad_weak_ptr
Original:
constructs the bad_weak_ptr object
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(função pública membro)

Inherited from std::exception

Member functions

[virtual]
destrói o objeto de exceção
Original:
destructs the exception object
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(of std::exception função pública virtual membro) [edit]
[virtual]
retorna uma cadeia explicativa
Original:
returns an explanatory string
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(of std::exception função pública virtual membro) [edit]

[editar] Exemplo

#include <memory>
#include <iostream>
int main()
{
    std::shared_ptr<int> p1(new int(42));
    std::weak_ptr<int> wp(p1);
    p1.reset();
    try {
        std::shared_ptr<int> p2(wp);
    } catch(const std::bad_weak_ptr& e) {
        std::cout << e.what() << '\n';
    }
}

Output:

std::bad_weak_ptr

[editar] Veja também

smart pointer with shared object ownership semantics
(modelo de classe) [edit]
(C++11)
referência fraca para um objeto gerenciado por std::shared_ptr
Original:
weak reference to an object managed by std::shared_ptr
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(modelo de classe) [edit]