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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).

smart pointer to share an object with

*this.

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

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

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