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std::bad_weak_ptr

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std::bad_weak_ptr
 

Template:ddcl list begin <tr class="t-dsc-header">

<td>
Defined in header <memory>
</td>

<td></td> <td></td> <tr class="t-dcl-sep"><td></td><td></td><td></td></tr>

<tr class="t-dcl ">

<td >
class bad_weak_ptr;
</td>

<td class="t-dcl-nopad"> </td> <td > (since C++11) </td> </tr> Template:ddcl list end

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.

cpp/error/exceptionstd-bad weak ptr-inheritance.svg
About this image

Inheritance diagram

Contents

Member functions

constructs the bad_weak_ptr object
(public member function)

Inherited from std::exception

Member functions

[virtual]
destructs the exception object
(virtual public member function of std::exception) [edit]
[virtual]
returns an explanatory string
(virtual public member function of std::exception) [edit]

Example

#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

See also

Template:cpp/memory/dcl list shared ptrTemplate:cpp/memory/dcl list weak ptr