Abstracting Swift Actor's impl into protocol. https://twitter.com/inamiy/status/1479670050215063557

abstracting-actor-into-protocol.swift

// Q. How to abstract Actor's impl into protocol?

// 1. Plain protocol + async methods
protocol MyProtocol
{
    var foo: Int { get async }

    func bar() async
}

// NOTE: `async` methods are always required.
actor MyActor: MyProtocol
{
    var foo: Int {
        get async { 1 }
    }

    func bar() async
    {
    }
}

// 2. Actor-constrained protocol
protocol MyProtocol2: Actor
{
    var foo: Int { get }

    func bar()
}

actor MyActor2: MyProtocol2
{
    var foo: Int {
        get { 1 }
    }

    func bar()
    {
    }
}