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std::weak_ptr<T>::operator= - cppreference.com

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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