package shared

func MapChildToParent[P any, C any, K comparable](
	parents []P,
	children []C,
	parentKey func(*P) K,
	childKey func(C) K,
	attach func(*P, C),
) {
	index := make(map[K]*P)

	for i := range parents {
		index[parentKey(&parents[i])] = &parents[i]
	}

	for _, c := range children {
		if p, ok := index[childKey(c)]; ok {
			attach(p, c)
		}
	}
}