Unregister the metric collection callback associated with this handle (if isRegistered is true). Take an ownership on the metric collection callback registration associated with the specified original handle. Afterwards, original will no longer manage the registration, and original.isRegistered() will be false.
Declared in <bdlm_metricsregistry.h>
MetricsRegistryRegistrationHandle&
operator=(bslmf::MovableRef<MetricsRegistryRegistrationHandle> original) noexcept;