public bool MoveNext()
{
switch (state)
{
case EnumeratorState.Enumerating:
if (++sourceIndex >= end)
{
state = EnumeratorState.Complete;
return(false);
}
var enumerable = selector.Invoke(source[sourceIndex]);
subEnumerator = enumerable.GetEnumerator();
state = EnumeratorState.EnumeratingSub;
goto case EnumeratorState.EnumeratingSub;
case EnumeratorState.EnumeratingSub:
if (!subEnumerator.MoveNext())
{
state = EnumeratorState.Enumerating;
goto case EnumeratorState.Enumerating;
}
return(true);
default:
return(false);
}
}
internal DisposableEnumerator(DoublyLinkedList <T> list)
{
this.list = list;
version = list.version;
current = null;
state = list.IsEmpty ? EnumeratorState.Empty : EnumeratorState.First;
}
/// <summary>
/// Advances the enumerator to the next element of the collection.
/// </summary>
///
/// <returns>
/// true if the enumerator was successfully advanced to the next
/// element; false if the enumerator has passed the end of the collection.
/// </returns>
///
/// <exception cref="T:System.InvalidOperationException">
/// The collection was modified after the enumerator was created.
/// </exception>
/// <filterpriority>2</filterpriority>
public bool MoveNext()
{
bool hasNext = GoNext();
State = hasNext ? EnumeratorState.InProgress : EnumeratorState.AfterFinish;
return(hasNext);
}
public bool MoveNext()
{
var index = _currentState.Index + 1;
if (_onValues)
{
if (index >= _currentState.Branch.Values.Length)
{
index = 0;
_onValues = false;
}
else
{
_currentState.Index = index;
return(true);
}
}
_currentState.Index = index;
if (index >= _currentState.Branch.Branches.Length)
{
if (_currentSlot == 0)
{
return(false);
}
_currentSlot--;
_currentState = CurrentStackState(ref this);
return(MoveNext());
}
var branch = _currentState.Branch.Branches[index];
ref var nextState = ref CurrentStackState(ref this);
internal Enumerator(SpanSelectManyEnumerable <TSource, TSubEnumerable, TSubEnumerator, TResult, TSelector> enumerable)
{
source = enumerable.source;
selector = enumerable.selector;
state = EnumeratorState.Enumerating;
sourceIndex = -1;
end = sourceIndex + enumerable.source.Length;
subEnumerator = default;
}
public static void CheckCurrentState(EnumeratorState state)
{
if (state == EnumeratorState.Before)
{
throw new EnumeratorInvalidStateException("Enumerator in initial satte. Use MoveNext() for moving to 1st element.");
}
if (state == EnumeratorState.After)
{
throw new EnumeratorInvalidStateException("End of enumerator. Use Reset().");
}
}
internal Enumerator(Branch start)
{
_start = start;
_slot0 = default;
_slot1 = default;
_slot2 = default;
_slot3 = default;
_slot4 = default;
_slot5 = default;
_slot6 = default;
_currentState = new EnumeratorState(start, -1);
_onValues = true;
_currentSlot = 0;
}
public bool MoveNext()
{
if (_enumeratorState == EnumeratorState.Ended)
{
throw Error.EnumerationFinished();
}
bool result = DoMoveNext();
if (result)
{
_enumeratorState = EnumeratorState.Started;
}
else
{
_enumeratorState = EnumeratorState.Ended;
}
return(result);
}
public bool MoveNext()
{
if (_enumeratorState == EnumeratorState.Ended)
{
throw new InvalidOperationException("Enumeration already finished.");
}
bool result = DoMoveNext();
if (result)
{
_enumeratorState = EnumeratorState.Started;
}
else
{
_enumeratorState = EnumeratorState.Ended;
}
return(result);
}
public void Reset()
{
DoReset();
_enumeratorState = EnumeratorState.NotStarted;
}
/// <summary>
/// Sets the enumerator to its initial position, which is before
/// the first element in the collection. This implementation
/// always throw <see cref="NotSupportedException"/>.
/// </summary>
/// <remarks>
/// This method is intentionally sealed. Derived class should override
/// <see cref="DoReset"/> protected method instead.
/// </remarks>
/// <exception cref="NotSupportedException">
/// Always thrown.
/// </exception>
/// <exception cref="T:System.InvalidOperationException">
/// The collection was modified after the enumerator was created.
/// </exception>
/// <filterpriority>2</filterpriority>
public void Reset()
{
DoReset();
_state = EnumeratorState.BeforeStart;
}
