public static T[] ToArray <T>(this IPiece <T> piece, int position, int length)
{
if (position + length > piece.Length)
{
throw new ArgumentOutOfRangeException();
}
var destination = new T[length];
piece.CopyTo(destination, 0, position, length);
return(destination);
}
public void CopyTo(T[] destination, int destinationIndex, int sourceIndex, int length)
{
_piece.CopyTo(destination, destinationIndex, _index + sourceIndex, length);
}