I'm confused by a paragraph in the <documentation on functional interfaces>: &gt; &gt; ```fun inter...

# getting-started

[Klitos Kyriacou]

I'm confused by a paragraph in the documentation on functional interfaces:

```fun interface Printer {

fun print()

}```

Its constructor will be created implicitly, and any code using the ::Printer function reference will compile. For example:

documentsStorage.addPrinter(::Printer)

On this page, the addPrinter function is not mentioned anywhere. What would its parameter type be, and how would it be used?

[Youssef Shoaib [MOD]]

probably:

fun DocumentsStorage.addPrinter(printer: (() -> Unit) -> Printer)

Not sure how useful it really is to be honest.

[Youssef Shoaib [MOD]]

For type-related questions btw, you can write some of the code in Idea, and then Ctrl+Shift+P on it to see its type

[ephemient]

given that the code above it has

fun Printer(block: () -> Unit): Printer

that is the declaration ::Printer was referencing previously, and the docs say that works with fun interface and no additional function instead

[Klitos Kyriacou]

I see, thanks