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std::bad_weak_ptr

STD：不好[医]弱[医]PTR

Defined in header ​​
class bad_weak_ptr;​(since C++11)

std::bad_weak_ptr的构造函数作为异常抛出的对象的类型。std::shared_ptr那就std::weak_ptr作为论据，当std::weak_ptr引用已删除的对象。

二次

二次

继承图

成员函数

(constructor)constructs the bad_weak_ptr object (public member function)

继承自STD：例外

成员函数

(destructor) virtualdestructs the exception object (virtual public member function of std::exception)
what virtualreturns an explanatory string (virtual public member function of std::exception)

例

二次

#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';
    }
}

二次

产出：

二次

std::bad_weak_ptr

二次

另见

shared_ptr (C++11)smart pointer with shared object ownership semantics (class template)
weak_ptr (C++11)weak reference to an object managed by std::shared_ptr (class template)

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