What's coming in Go 1.18

Posted Feb 9, 2022 8:45 UTC (Wed) by taladar (subscriber, #68407)
Parent article: What's coming in Go 1.18

> func min(x float32, y float32) float32 {
> if x < y {
> return x
> }
> return y
> }

> type ordered interface {
> float32 | float64 | int
> }
> func min[T ordered](x T, y T) T {
> if x < y {
> return x
> }
> return y
> }

That looks like it is significantly less expressive than proper generics with open traits/type classes/interfaces/...

Can you really only specify a closed, one-time list without being able to add new types to it later?

What's coming in Go 1.18

Posted Feb 9, 2022 13:19 UTC (Wed) by tsavola (subscriber, #37605) [Link]

constraints.Ordered was supposed to be shipped in the standard library (I guess it will be added in a later release). Go doesn't support operator overloading, so only primitive types (and ~primitive types) can have the < operator.

For generic code invoking methods, you can define interfaces with methods - you don't have to list concrete types.