Implicit Function Types

Dotty
46

For comparison, there is extension in kotlin:
see: https://kotlinlang.org/docs/reference/extensions.html
With this functionality we can make sql dsl:

fun search(name: String, minAge: Int?) = list {
    where {
        upper(c.name) like upper("%$name%")
        if (minAge != null) {
            and {
                c.age gte minAge
            }
        }
    }
}

In this example “where” is declared as:

fun where(op: WhereExpr.() -> Unit) =
            add(WhereExpr(this), op)

see:https://github.com/edvin/kdbc/blob/master/src/main/kotlin/kdbc/expression.kt

This is equivalent of scope injection.
It’s very convenient.