void g_signal_set_va_marshaller ( guint signal_id, GType instance_type, GSignalCVaMarshaller va_marshaller )
GSignalCVaMarshaller used for a given signal. This is a
specialised form of the marshaller that can often be used for the
common case of a single connected signal handler and avoids the
GValue. Its use is optional.
Available since: 2.32
The signal id.
The instance type on which to set the marshaller.
The marshaller to set.