Passing Option<SharedObject> as function argument

Technical Support
1

Hi everyone. I cannot find information on how to work with optional object arguments in the documentation or on Google.
I have a function, that should accept Option<SharedObject> because this object can exist only in certain circumstances.

If I pass an argument by reference like opt_arg: &mut Option<SharedObject> code compiles and tested without any errors, but on the runtime I’m getting UnusedValueWithoutDrop { result_idx: 2, secondary_idx: 0 } error, because tssdk under the hood performs a MoveCall to create option::some() or option::none().

If I pass an argument by value like opt_arg: Option<SharedObject>, I should destroy the Option object and re-share the SharedObject. But there is no way to re-share the object as transer::public_share_object will emit the ESharedNonNewObject error.

Also, there is no way to pass SharedObject to the Option by reference to not re-share it later.

Is there any solution for this? Or I need to have 2 functions with this SharedObject argument and without it?

2

In my testing using python, after adding a function to a test contract that accepts Option<Clock>, it builds ok but fails when invoking the function from client.

I don’t believe it is possible.