23 General utilities library [utilities]

23.11 Smart pointers [smartptr]

23.11.4 Class template weak_­ptr [util.smartptr.weak]

23.11.4.6 weak_­ptr specialized algorithms [util.smartptr.weak.spec]

template<class T> void swap(weak_ptr<T>& a, weak_ptr<T>& b) noexcept;
Effects: Equivalent to a.swap(b).