what's the correct way for a lambda to be returnin...

# getting-started

[jamie-purchase]

what's the correct way for a lambda to be returning void?
for example I have written this function fun createImage(sizeX: Int, sizeY: Int, logic: (g: Graphics) -> Void) : BufferedImage
and IDEA is moaning that my lambda usage is returning Unit and not Void
how do I say that the logic parameter can be a function that returns null
and how can I write the lambda to not return anything

myClass.createImage(64, 64)
{
    // invoking simple drawing functions using graphics but don't need to return anything
}