Difference between revisions of "cpp/memory/bad weak ptr"
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Revision as of 21:10, 26 August 2017
| 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
Contents |
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
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
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) |
