A gobject.Value to store the return value. May be NULL if the callback of closure doesn't return a value.
The length of the param_values array.
An array of gobject.Values holding the arguments on which to invoke the callback of closure.
The invocation hint given as the last argument to Closure.invoke.
Additional data specified when registering the marshaller, see Closure.setMarshal and Closure.setMetaMarshal
2.30
A generic marshaller function implemented via libffi.
Normally this function is not passed explicitly to g_signal_new(), but used automatically by GLib when specifying a NULL marshaller.