UseMyDIContainer.swift

// DIContainer를 상속 받아 configure를 override하여 사용하는 방법
class MyContainer: DIContainer {
    override func configure() {
        registerSingleton { Earth() }

        register { Book() }
        register { Pen() }
        register { PencilCase(pen: self.resolve()) }
        register { Bag(pencilCase: self.resolve(), book: self.resolve()) }
        register { Human(bag: self.resolve()) }
        
        register(key: "happy") { Dog(name: "happy") }
        register(key: "goofy") { Dog(name: "goofy") }
    }
}