std::weak_ptr<T>::reset
Since C++11
void reset() noexcept;
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';
}
Result
shared.use_count(): 3
weak.use_count(): 3
weak.expired(): false
weak.reset();
shared.use_count(): 3
weak.use_count(): 0
weak.expired(): true