23 General utilities library [utilities]

23.11 Smart pointers [smartptr]

23.11.2 Shared-ownership pointers [util.smartptr]

23.11.2.3 Class template weak_­ptr [util.smartptr.weak]

23.11.2.3.3 weak_­ptr assignment [util.smartptr.weak.assign]

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

1
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Effects: Equivalent to weak_­ptr(r).swap(*this).

2
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Remarks: The implementation may meet the effects (and the implied guarantees) via different means, without creating a temporary.

3
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Returns: *this.

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

4
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Effects: Equivalent to weak_­ptr(std​::​move(r)).swap(*this).

5
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Returns: *this.