W3cubDocs
/C++std::bad_weak_ptr
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.
Member functions
| (constructor) | constructs the bad_weak_ptr object (public member function) |
std::bad_weak_ptr ::bad_weak_ptr()
bad_weak_ptr() noexcept; |
Constructs a new instance of std::bad_weak_ptr. what() returns an implementation-defined null-terminated byte string.
Parameters
(none).
Inherited from std::exception
Member functions
|
[virtual] | destroys the exception object (virtual public member function of std::exception) |
|
[virtual] | returns an explanatory string (virtual public member function of std::exception) |
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
|
(C++11) | smart pointer with shared object ownership semantics (class template) |
|
(C++11) | weak reference to an object managed by std::shared_ptr (class template) |
© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
http://en.cppreference.com/w/cpp/memory/bad_weak_ptr