How do you write "member" with the proposed generics draft?

[Juliusz Chroboczek]

I'd be grateful if people could give me an example to help me understand
the generics draft. Suppose I've got these two functions:

func MemberInt(x int, a []int) bool {
for _, v := range a {
if v == x {
return true
}
}
return false
}

func MemberIP(x net.IP, a []net.IP) bool {
for _, v := range a {
if v.Equal(x) {
return true
}
}
return false
}

I can see how to write a generic "Member" function that takes an extra
equality predicate; but is there a way to write a function that
generalises both functions above without requiring the extra parameter?

Thanks.

[Axel Wagner]

No, that's not possible. A generic function can only work with *either* built in operators *or* methods. So, you always need to have two functions: https://go2goplay.golang.org/p/YuzSzDAOEo2

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[Andrei Tudor Călin]

I feel like https://go2goplay.golang.org/p/RLn9BXjU1OR is a better compromise than having two functions.

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Andrei Călin

[Axel Wagner]

Prolly. Except OP specifically asked about "not that" :)

[Juliusz Chroboczek]

Axel Wagner writes:

> I feel like https://go2goplay.golang.org/p/RLn9BXjU1OR is a better
> compromise than having two functions.

> Prolly. Except OP specifically asked about "not that" :)

Agreed on both counts.