W3cubDocs

/C++

std::weak_ptr<T>::operator=

weak_ptr& operator=( const weak_ptr& r ) noexcept;
(1) (since C++11)
template< class Y > 
weak_ptr& operator=( const weak_ptr<Y>& r ) noexcept;
(2) (since C++11)
template< class Y > 
weak_ptr& operator=( const shared_ptr<Y>& r ) noexcept;
(3) (since C++11)
weak_ptr& operator=( weak_ptr&& r ) noexcept;
(4) (since C++11)
template< class Y > 
weak_ptr& operator=( weak_ptr<Y>&& r ) noexcept;
(5) (since C++11)

Replaces the managed object with the one managed by r. The object is shared with r. If r manages no object, *this manages no object too.

1-3) Equivalent to std::weak_ptr<T>(r).swap(*this).
4,5) Equivalent to std::weak_ptr<T>(std::move(r)).swap(*this).

Parameters

r - smart pointer to share an object with

Return value

*this.

Notes

The implementation may meet the requirements without creating a temporary weak_ptr object.

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior
LWG 2315 C++11 move semantic was not enabled for weak_ptr enabled

See also

creates a new weak_ptr
(public member function)
swaps the managed objects
(public member function)

© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
https://en.cppreference.com/w/cpp/memory/weak_ptr/operator%3D