Creates a closure to invoke the function called function_name.
This is using the create_closure implementation of this's [[email protected]].
If no closure could be created, null will be returned and throws will be set.
| this |
a `GtkBuilder` |
| function_name |
name of the function to look up |
| flags |
closure creation flags |
| object |
Object to create the closure with |
|
A new closure for invoking |