/// <summary>
/// Initializes a new instance of the <see cref="PartitionEnumerator{T}"/> class.
/// Creates an instance that enumerates objects starting at the specified position in <see cref="IPartition{T}"/>.
/// </summary>
/// <param name="partition">The enumerated partition.</param>
/// <param name="segmentIndex">The segment index of the position of the first element to enumerate.</param>
/// <param name="elementIndex">The element index of the position of the first element to enumerate.</param>
public PartitionEnumerator(IPartition <T> partition, int segmentIndex, int elementIndex)
{
Debug.Assert(partition.IsValidPosition(segmentIndex, elementIndex, false));
Partition = partition;
SegmentIndex = segmentIndex;
Enumerator = partition.GetSegmentEnumerator(segmentIndex, elementIndex, out SegmentCount);
}