Deriving Contract Reference from `ink::trait_definition`

Question

Is it possible to create a Contract Reference to perform a Cross-Contract call from ink::trait_definition?

If it is, how can I do so?

If it is not, why it is not possible? It seems strange that we can only create a reference to the whole contract and not to a single trait the contract is implementing.

Answer 1

There is a macro that based on ink trait creates an associated type for safe cross-contract calls:

https://paritytech.github.io/ink/ink/macro.contract_ref.html