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std::weak_ptr<T>::reset

From cppreference.com
< cpp‎ | memory‎ | weak ptr
 
 
Memory management library
(exposition only*)
Uninitialized storage (until C++20)
(until C++20*)
(until C++20*)

(C++11)(until C++23)
(C++11)(until C++23)
(C++11)(until C++23)
(C++11)(until C++23)
(C++11)(until C++23)
(C++11)(until C++23)
 
 
void reset() noexcept;
(since C++11)

Releases the reference to the managed object. After the call *this manages no object.

[edit] Parameters

(none)

[edit] Return value

(none)

[edit] Example

Run this code
#include <iostream>
#include <memory>
 
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

[edit] See also

checks whether the referenced object was already deleted
(public member function) [edit]
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