| title |
bad_weak_ptr Class |
| ms.date |
11/04/2016 |
| f1_keywords |
|
| helpviewer_keywords |
bad_weak_ptr |
bad_weak_ptr class |
|
| ms.assetid |
a09336d5-7237-4480-ab6b-3787e0e6025e |
Reports bad weak_ptr exception.
class bad_weak_ptr : public std::exception
{
bad_weak_ptr();
const char *what() throw();
};Remarks
The class describes an exception that can be thrown from the shared_ptr Class constructor that takes an argument of type weak_ptr Class. The member function what returns "bad_weak_ptr".
// std__memory__bad_weak_ptr.cpp
// compile with: /EHsc
#include <memory>
#include <iostream>
int main()
{
std::weak_ptr<int> wp;
{
std::shared_ptr<int> sp(new int);
wp = sp;
}
try
{
std::shared_ptr<int> sp1(wp); // weak_ptr has expired
}
catch (const std::bad_weak_ptr&)
{
std::cout << "bad weak pointer" << std::endl;
}
catch (...)
{
std::cout << "unknown exception" << std::endl;
}
return (0);
}weak_ptr Class