Set<Foo>

Set<Bar>

Set

object

abstract class Foo(val num: Int)

// Error: expecting a class body
val x = object : Foo(42)

// Works
val y = object : Foo(42) {}

error: unresolved reference: b

fun removePages():Int=b.pages-Random().nextInt(0,100)

as Any

Property Wrapper

class MainWindow {
    // ...
    var winPtr: CPointer<GtkWidget>? = null
    var title: String
        set(value) = gtk_window_set_title(winPtr?.reinterpret(), value)
        get() = gtk_window_get_title(winPtr?.reinterpret())?.toKString() ?: ""
    // ...
}

{
    "responseCode": 200
    "responseMessage": "You did something successfully"
}

{
    "errorCode": 401
    "errorDescription": "Permission denied"
}

data class MyDataClass(
    val responseCode: Int,
    val responseMessage: String
): MyAbstractClass()

data class MyOtherDataClass(
    val errorCode: Int,
    val errorDescription: String
): MyAbstractClass()

@JsonSubTypes(
    JsonSubTypes.Type(value = MyDataClass::class),
    JsonSubTypes.Type(value = MyOtherDataClass::class)
)
@JsonIgnoreProperties(ignoreProperties = true)
abstract class MyAbstractClass

fun receiveMessage(message: String) {
    val convertedMessage = jacksonObjectMapper().readValue<MyAbstractClass>(message)

    <http://log.info|log.info>(convertedMessage)
    /* prints either:
    MyDataClass(responseCode=200, responseMessage=You did something successfully)
    OR
    MyOtherDataClass(errorCode=401, errorDescription=Permission denied)
    */
}

@JsonTypeInfo

@JsonTypeInfo

property testing

The superclass constructor that gets invoked is the one with all the parameters, with supplied defaults.