private void PerformIteration()
{
if (!_enumerator.MoveNext())
{
Current = _next != null
? new EnumeratorValue <T>(_next.Value, _index++, true)
: EnumeratorValue <T> .Empty;
_next = null;
return;
}
if (_next == null)
{
_next = new Container <T>((T)_enumerator.Current);
return;
}
Current = new EnumeratorValue <T>(_next.Value, _index++, false);
_next.Value = (T)_enumerator.Current;
}
private void PerformIteration()
{
if (!_enumerator.MoveNext())
{
Current = _hasNext
? new EnumeratorValue <T>(_next, _index++, true)
: new EnumeratorValue <T>();
_hasNext = false;
_next = default;
return;
}
if (!_hasNext)
{
_hasNext = true;
_next = (T)_enumerator.Current;
return;
}
Current = new EnumeratorValue <T>(_next, _index++, false);
_next = (T)_enumerator.Current;
}