/// <summary>
/// Tries to get value from collection and return success status.
/// Notifies if next value is ready.
/// Resets enumerator if source is inexhaustible and last element of collection is already reached.
/// </summary>
/// <param name="value">Output parameter for pulled value.</param>
/// <returns>True if value was successfully extracted or false otherwise.</returns>
public override bool Pull(out T value)
{
if (_hasNext)
{
value = _enumerator.Current;
_hasNext = _enumerator.MoveNext();
if (_hasNext || !_exhaustible)
{
ValueReady?.Invoke(this);
}
return(true);
}
else
{
if (!_exhaustible)
{
_enumerator.Reset();
_hasNext = _enumerator.MoveNext();
return(Pull(out value));
}
else
{
_exhausted = true;
value = default(T);
return(false);
}
}
}
/// <summary>
/// Tries to get value and return success status. Notifies if next value is ready.
/// </summary>
/// <param name="value">Output parameter for pulled value.</param>
/// <returns>True if value was successfully extracted or false otherwise.</returns>
public override bool Pull(out T value)
{
if (!_exhausted)
{
value = _value;
if (_exhaustible)
{
_exhausted = true;
}
else
{
ValueReady?.Invoke(this);
}
return(true);
}
value = default(T);
return(false);
}
/// <summary>
/// Event handler method for ValueEnqueued event fired by inner queue.
/// </summary>
private void ValueEnqueued()
{
ValueReady?.Invoke(this);
}
