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std::weak_ptr::operator=

weak_ptr& operator=( const weak_ptr& r );	(1)	(since C++11)
template< class Y > weak_ptr& operator=( const weak_ptr<Y>& r );	(2)	(since C++11)
template< class Y > weak_ptr& operator=( const shared_ptr<Y>& r );	(3)	(since C++11)
weak_ptr& operator=( weak_ptr&& r );	(4)	(since C++14)
template< class Y > weak_ptr& operator=( weak_ptr<Y>&& r );	(5)	(since C++14)

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.

noexcept specification:

noexcept

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

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