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// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
// Package cmpx has code that will likely land in a future version of Go, but
// we want sooner.
package cmpx
// Or returns the first non-zero element of list, or else returns the zero T.
//
// This is the proposal from
// https://github.com/golang/go/issues/60204#issuecomment-1581245334.
func Or[T comparable](list ...T) T {
// TODO(bradfitz): remove the comparable constraint so we can use this
// with funcs too and use reflect to see whether they're non-zero? 🤷♂️
var zero T
for _, v := range list {
if v != zero {
return v
}
}
return zero
}
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