Mathematical operations - the generics way

Endre Simo

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Mar 18, 2022, 1:45:44 PM3/18/22

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Now that generics are officially supported, I was checking in the Go source if there are some generic implementation of utility methods like Abs, Min, Max etc, but I couldn't find it other than this proposal https://github.com/golang/go/discussions/48287.

Anyone knows if something related has been adopted and implemented in Go 1.18?

fge...@gmail.com

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Mar 19, 2022, 6:22:39 AM3/19/22

to Endre Simo, golang-nuts

some details: https://github.com/golang/go/issues/48918

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Endre Simo

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Mar 22, 2022, 11:58:40 AM3/22/22

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I found a working version meantime.

// Max returns the bigger value between two numbers.
func Max[T constraints.Ordered](x, y T) T {
        if x > y {
                return x
        }
        return y
}

// Abs returns the absolut value of x.
func Abs[T constraints.Signed | constraints.Float](x T) T {
        if x < 0 {
                return -x
        }
        return x
}

Paul Hankin

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Mar 25, 2022, 4:34:16 AM3/25/22

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I don't know if it's important to you, but your Max[float64] isn't compatible with math.Max in the standard library.

For example, Max[float64](NaN, 1) returns 1 rather than NaN.

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