[util.smartptr.weak.assign]

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constexpr weak_ptr& operator=(const weak_ptr& r) noexcept;
template<class Y> constexpr weak_ptr& operator=(const weak_ptr<Y>& r) noexcept;
template<class Y> constexpr weak_ptr& operator=(const shared_ptr<Y>& r) noexcept;

Remarks: The implementation may meet the effects (and the implied guarantees) via different means, without creating a temporary object.

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constexpr weak_ptr& operator=(weak_ptr&& r) noexcept;
template<class Y> constexpr weak_ptr& operator=(weak_ptr<Y>& r) noexcept;

Returns: *this.

20 Memory management library [mem]

20.3 Smart pointers [smartptr]

20.3.2 Shared-ownership pointers [util.sharedptr]

20.3.2.3 Class template weak_ptr [util.smartptr.weak]

20.3.2.3.4 Assignment [util.smartptr.weak.assign]