How to replace ::new in kotlin?

Question

Following a tutorial on Disruptor in Java and they make the following call

Disruptor<LongEvent> disruptor = new Disruptor<>(LongEvent::new, bufferSize, executor);

Where LongEvent is instantiated using a default constructor of no argument- ie. new LongEvent().

The equivalent line in Kotlin is throwing an error at the ::new. What is the correct syntax for ::new in Kotlin?

# THIS IS INVALID
val disruptor = Disruptor<LongEvent>(LongEvent::new, bufferSize, executor)

holi-java · Answer 1 · 2017-06-30T17:02:49.303

5

the constructor reference expression in kotlin is ::LongEvent.

Constructors can be referenced just like methods and properties. Constructors are referenced by using the :: operator and adding the class name.

edited Jun 30 '17 at 17:02

answered Jun 30 '17 at 16:57

holi-java

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Thanks. Sorry, didn't know what to search to find that duplicated question. – Adam Hughes Jun 30 '17 at 16:58
@AdamHughes Not at all. you can see more detailed here: https://kotlinlang.org/docs/reference/reflection.html#constructor-references – holi-java Jun 30 '17 at 17:01

How to replace ::new in kotlin?

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