std::weak_ptr<T>::reset
void reset() noexcept; |
(since C++11) |
Releases the reference to the managed object. After the call *this manages no object.
Parameters
(none).
Return value
(none).
Example
#include <memory>
#include <iostream>
int main()
{
auto shared = std::make_shared<int>(), shared2 = shared, shared3 = shared2;
auto weak = std::weak_ptr<int>{shared};
std::cout << std::boolalpha
<< "shared.use_count(): " << shared.use_count() << '\n'
<< "weak.use_count(): " << weak.use_count() << '\n'
<< "weak.expired(): " << weak.expired() << '\n';
weak.reset();
std::cout << "weak.reset();\n"
<< "shared.use_count(): " << shared.use_count() << '\n'
<< "weak.use_count(): " << weak.use_count() << '\n'
<< "weak.expired(): " << weak.expired() << '\n';
}
Output:
shared.use_count(): 3 weak.use_count(): 3 weak.expired(): false weak.reset(); shared.use_count(): 3 weak.use_count(): 0 weak.expired(): true
See also
| checks whether the referenced object was already deleted (public member function) |
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https://en.cppreference.com/w/cpp/memory/weak_ptr/reset
