/// <summary>
/// Initializes a new instance of the <see cref="LargeEnumerator"/> struct.
/// Creates an instance that enumerates objects over a collection of segments.
/// </summary>
/// <param name="partition">The collection of segments enumerated by the new enumerator.</param>
/// <param name="index">The index of the first item to enumerate.</param>
/// <param name="count">The number of items to enumerate.</param>
internal LargeEnumerator(IPartition <T> partition, long index, long count)
{
Partition = partition;
int SegmentIndex;
int ElementIndex;
int CacheIndex;
Partition.GetPosition(index, out SegmentIndex, out ElementIndex, out CacheIndex);
Enumerator = Partition.GetEnumerator(SegmentIndex, ElementIndex);
Count = count;
}
public override bool MoveNext()
{
switch (state)
{
case 1:
_enumerator = _source.GetEnumerator();
state = 2;
goto case 2;
case 2:
if (_enumerator.MoveNext())
{
current = _selector(_enumerator.Current);
return(true);
}
Dispose();
break;
}
return(false);
}