Attribute Macro contract

#[contract]

Marks a type as being the type that contract functions are attached for.

Use #[contractimpl] on impl blocks of this type to make those functions contract functions.

Note that a crate only ever exports a single contract. While there can be multiple types in a crate with #[contract], when built as a wasm file and deployed the combination of all contract functions and all contracts within a crate will be seen as a single contract.

Examples

Define a contract with one function, hello, and call it from within a test using the generated client.

use soroban_sdk::{contract, contractimpl, vec, symbol_short, BytesN, Env, Symbol, Vec};

#[contract]
pub struct HelloContract;

#[contractimpl]
impl HelloContract {
    pub fn hello(env: Env, to: Symbol) -> Vec<Symbol> {
        vec![&env, symbol_short!("Hello"), to]
    }
}

#[test]
fn test() {
    let env = Env::default();
    let contract_id = env.register(HelloContract, ());
    let client = HelloContractClient::new(&env, &contract_id);

    let words = client.hello(&symbol_short!("Dev"));

    assert_eq!(words, vec![&env, symbol_short!("Hello"), symbol_short!("Dev"),]);
}