hello, a question related to SAM functional interf...

# announcements

[Andreas Unterweger]

hello, a question related to SAM functional interfaces

interface RequestAuth {
    fun header(): Pair<String, String>
}
val instance = object : RequestAuth {
                override fun header(): Pair<String, String> = "name" to "value"
            }

cant this be done more more concisely? sth like

val instance = object : RequestAuth { "name" to "value" }

[diesieben07]

This will be supported in 1.4 with the new type inference.
Until then you can do something like this:

interface RequestAuth {
    fun header(): Pair<String, String>
    companion object {
        inline operator fun invoke(crossinline body: () -> Pair<String, String>) = object : RequestAuth {
            override fun header() = body()
        }
    }
}

[marstran]

Not until v1.4. In 1.4 you can create a fun interface that will work as a SAM-interface. Then you can do this:

fun interface RequestAuth {
    fun header(): Pair<String, String>
}

val instance: RequestAuth = { "name" to "value" }

[marstran]

Both answers at the exact same time 😛

[Andreas Unterweger]

thx...waiting 1.4 then....