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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
// Package checkchange defines a utility for determining whether a value
// has changed since the last time it was checked.
package checkchange
// EqualCloner is an interface for types that can be compared for equality
// and can be cloned.
type EqualCloner[T any] interface {
Equal(T) bool
Clone() T
}
// Update sets *old to a clone of new if they are not equal, returning whether
// they were different.
//
// It only modifies *old if they are different. old must be non-nil.
func Update[T EqualCloner[T]](old *T, new T) (changed bool) {
if (*old).Equal(new) {
return false
}
*old = new.Clone()
return true
}
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