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std::bad_weak_ptr

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< cpp‎ | memory

 
 
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std::bad_weak_ptr
Membri funzioni
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bad_weak_ptr::bad_weak_ptr
 
Defined in header <memory>
class bad_weak_ptr;
(dal C++11)
std::bad_weak_ptr è il tipo di oggetto lanciato come eccezioni dai costruttori di std::shared_ptr che prendono std::weak_ptr come argomento, quando il std::weak_ptr si riferisce ad un oggetto già eliminati.
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
Informazioni sull'immagine

Inheritance diagram

Indice

[modifica] Membri funzioni

costruisce l'oggetto bad_weak_ptr
Original:
constructs the bad_weak_ptr object
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(membro pubblico funzione)

Inherited from std::exception

Member functions

[virtuale]
distrugge l'oggetto eccezione
Original:
destructs the exception object
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(pubblico virtuale membro of std::exception funzione) [edit]
[virtuale]
restituisce una stringa esplicativa
Original:
returns an explanatory string
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(pubblico virtuale membro of std::exception funzione) [edit]

[modifica] Esempio

#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

[modifica] Vedi anche

smart pointer with shared object ownership semantics
(classe template) [edit]
(C++11)
riferimento debole a un oggetto gestito da std::shared_ptr
Original:
weak reference to an object managed by std::shared_ptr
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(classe template) [edit]