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Showing content from https://timsong-cpp.github.io/cppwp/n4659/util.smartptr.weak.assign below:

[util.smartptr.weak.assign]

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;

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

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

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

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


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