}

	var err error
	a.alloc, err = allocatorFactory(max, rangeSpec, calculateRangeOffset(pr))
	if err != nil {
		return nil, err
	}

	return a, err
}

// NewInMemory creates an in-memory allocator.
func NewInMemory(pr net.PortRange) (*PortAllocator, error) {
	return New(pr, func(max int, rangeSpec string, offset int) (allocator.Interface, error) {