// Restore restores the pool to the previously captured state. ErrMismatchedNetwork
// is returned if the provided port range doesn't exactly match the previous range.
func (r *Allocator) Restore(into *mcs.Range, data []byte) error {
	if into.String() != r.r.String() {
		return ErrMismatchedRange
	}
	snapshottable, ok := r.alloc.(allocator.Snapshottable)
	if !ok {
		return fmt.Errorf("not a snapshottable allocator")
	}
	return snapshottable.Restore(into.String(), data)
}
// New creates a Allocator over a UID range, calling factory to construct the backing store.
func New(r *mcs.Range, factory allocator.AllocatorFactory) *Allocator {
	return &Allocator{
		r:     r,
		alloc: factory(int(r.Size()), r.String()),
	}
}