Creates a closure to invoke the function called @function_name.
This is using the create_closure() implementation of @builder's [class@Gtk.BuilderScope].
If no closure could be created, %NULL will be returned and @error will be set.
name of the function to look up
closure creation flags
Object to create the closure with
A new closure for invoking @function_name
GException on failure.
See Implementation
Creates a closure to invoke the function called @function_name.
This is using the create_closure() implementation of @builder's [class@Gtk.BuilderScope].
If no closure could be created, %NULL will be returned and @error will be set.