# std::weak_ptr<T>::operator=

From cppreference.com
< cpp‎ | memory‎ | weak ptr

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

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

Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/memory/weak_ptr/operator%3D&oldid=153991"