CODEWITHSUNDEEP
genericskotlin
frenchdonuts
frenchdonuts

Reputation: 1412

Generic extending class AND implements interface in Kotlin

Say I want a type variable, T, that extends a certain class and implements an interface. Something like:

class Foo <T : Bar implements Baz> { ... }

What is the syntax for this in Kotlin?

Upvotes: 131

Views: 68070

Answers (1)

hotkey
hotkey

Reputation: 148159

Only one upper bound can be specified inside the angle brackets.

Kotlin offers different syntax for generic constraints when there is more than one constraint:

class Foo<T>(val t: T) where T : Bar, T : Baz { ... }

and for functions:

fun <T> f(): Foo where T : Bar, T : Baz { ... }

It is documented here.

Upvotes: 267

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