Attribute Macro sewup_derive::ewasm_main

#[ewasm_main]

ewasm_main is a macro for the main function of the contract There are three different contract output.

#[ewasm_main] The default contract output, the error will be return as a string message This is for a scenario that you just want to modify the data on chain only, and the error will to string than return.

#[ewasm_main(rusty)] The rust styl output, the result object from ewasm_main function will be returned, this is for a scenario that you are using a rust client to catch and want to catch the result from the contract.

#[ewasm_main(unwrap)] The unwrap the output of the result object from ewasm_main function. This is for a scenario that you are using a rust non-rust client, and you are only care the happy case of excuting the contract.