Kotlin Delegate Pattern

https://github.com/DNights/KotlinDelegateSample

GitHub - DNights/KotlinDelegateSample

 

Kotlin Delegate Pattern 이란?

Kotlin Delegate Pattern은 클래스에서 특정 기능을 제공하지 않더라도 해당 기능을 제공하는 다른 클래스에 위임하는 방법입니다. 이를 통해 클래스는 더 간결하고 유지 관리가 쉬워집니다.

Delegate Pattern을 사용하려면 먼저 Delegate 클래스를 정의해야 합니다. 이 클래스는 클래스가 제공해야 하는 기능을 구현해야 합니다. 그런 다음 클래스에서 Delegate 클래스의 인스턴스를 생성하고 해당 인스턴스를 클래스의 속성에 할당해야 합니다. 클래스의 속성에 값을 할당할 때 Delegate 클래스는 해당 값을 처리하고 클래스에 필요한 기능을 제공합니다.

Delegate Pattern은 클래스를 더 간결하고 유지 관리가 쉬운 방법으로 특정 기능을 제공하는 데 유용합니다. 또한 클래스가 제공하지 않는 기능을 제공하는 데에도 유용합니다.

 

Sample code

interface Base {
    fun print()
}

class BaseImpl(val x: Int) : Base {
    override fun print() { print(x) }
}

class Derived(b: Base) : Base by b

fun main() {
    val b = BaseImpl(10)
    Derived(b).print()
}

결과 값 10

 

 

 

 

[참고 자료]

https://kotlinlang.org/docs/delegation.html

Delegation | Kotlin

 

https://en.wikipedia.org/wiki/Delegation_pattern

Delegation pattern - Wikipedia

 

https://kotlinworld.com/85

[Delegate Pattern] 1. Delegate Pattern이란?

 

https://medium.com/genetec-tech/the-power-of-kotlin-delegation-e6d45fe85e24

The Power of Kotlin Delegation