NAME¶

std::weak_ptr::reset - std::weak_ptr::reset

Synopsis¶

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¶

// Run this code

#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¶

expired checks whether the referenced object was already deleted
(public member function)