std::bad_weak_ptr

From cppreference.com

Defined in header `<memory>`

class bad_weak_ptr;		(since C++11)

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.

Inheritance diagram

Inherited from std::exception

Member functions


(destructor) [virtual]	destructs the exception object (virtual public member function of `std::exception`)

what [virtual]	returns an explanatory string (virtual public member function of `std::exception`)

[edit] Example

run this code

#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

[edit] See also


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)

Language
Standard library headers
Concepts
Utilities library
Strings library
Containers library
Algorithms library
Iterators library
Numerics library
Input/output library
Localizations library
Regular expressions library (C++11)
Atomic operations library (C++11)
Thread support library (C++11)

std::bad_weak_ptr

Contents

[edit] Member functions

Inherited from std::exception

Member functions

[edit] Example

[edit] See also


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