the gobject.Closure to which the marshaller belongs
a gobject.Value to store the return value. May be NULL if the callback of closure doesn't return a value.
the instance on which the closure is invoked.
va_list of arguments to be passed to the closure.
additional data specified when registering the marshaller, see Closure.setMarshal and Closure.setMetaMarshal
the GType of each argument from args.
The GVaClosureMarshal equivalent to g_cclosure_marshal_VOID__DOUBLE().