kotlin-tips

仿C#中的Action和Func委托

//Action
typealias Action1<T1> = (t1: T1) -> Unit
typealias Action2<T1, T2> = (t1: T1, t2: T2) -> Unit
typealias Action3<T1, T2, T3> = (t1: T1, t2: T2, t3: T3) -> Unit
typealias Action4<T1, T2, T3, T4> = (t1: T1, t2: T2, t3: T3, t4: T4) -> Unit
typealias Action5<T1, T2, T3, T4, T5> = (t1: T1, t2: T2, t3: T3, t4: T4, t5: T5) -> Unit
typealias Action6<T1, T2, T3, T4, T5, T6> = (t1: T1, t2: T2, t3: T3, t4: T4, t5: T5, t6: T6) -> Unit
typealias Action7<T1, T2, T3, T4, T5, T6, T7> = (t1: T1, t2: T2, t3: T3, t4: T4, t5: T5, t6: T6, t7: T7) -> Unit

//Func
typealias Func1<T1, R> = (t1: T1) -> R
typealias Func2<T1, T2, R> = (t1: T1, t2: T2) -> R
typealias Func3<T1, T2, T3, R> = (t1: T1, t2: T2, t3: T3) -> R
typealias Func4<T1, T2, T3, T4, R> = (t1: T1, t2: T2, t3: T3, t4: T4) -> R
typealias Func5<T1, T2, T3, T4, T5, R> = (t1: T1, t2: T2, t3: T3, t4: T4, t5: T5) -> R
typealias Func6<T1, T2, T3, T4, T5, T6, R> = (t1: T1, t2: T2, t3: T3, t4: T4, t5: T5, t6: T6) -> R
typealias Func7<T1, T2, T3, T4, T5, T6, T7, R> = (t1: T1, t2: T2, t3: T3, t4: T4, t5: T5, t6: T6, t7: T7) -> R

使用

fun mian(args: Array<String>) {
    actionUsage { t1, t2 ->
        run {
            println(t1)
            println(t2)
        }
    }

    val printAction2: Action2<String, String> = { t1, t2 ->
        run {
            println(t1)
            println(t2)
        }
    }

    printAction2("hello", "world")

    val addFunc2: Func2<Int, Int, Int> = { t1, t2 ->
        run { t1 + t2 }
    }
    var t = addFunc2.invoke(1, 2)
}

fun actionUsage(action2: Action2<Int, String>) {
    action2.invoke(123, "hello world")
}

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