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]

23.11.2.3.4 weak_­ptr modifiers [util.smartptr.weak.mod]

void swap(weak_ptr& r) noexcept;

void reset() noexcept;