public bool MoveNext()
{
if (!_firstEdge)
{
while (_vertexEnumerator.MoveNext())
{
while (_graphEnumerator.MoveTo(_vertexEnumerator.Current))
{
if (!_graphEnumerator.MoveNext())
{
break;
}
_firstEdge = true;
return(true);
}
}
return(false);
}
while (true)
{
if (_graphEnumerator.MoveNext())
{
return(true);
}
if (!_vertexEnumerator.MoveNext())
{
return(false);
}
while (_graphEnumerator.MoveTo(_vertexEnumerator.Current))
{
if (_graphEnumerator.MoveNext())
{
return(true);
}
if (!_vertexEnumerator.MoveNext())
{
return(false);
}
}
}
}
/// <summary>
/// Moves the enumerator to the first edge of the given vertex.
/// </summary>
/// <param name="vertex">The vertex.</param>
/// <returns>True if the vertex exists.</returns>
public bool MoveTo(VertexId vertex)
{
if (_enumerator == null)
{
throw new InvalidOperationException(
$"Cannot reset an enumerator created from an {nameof(EdgeEnumerator)}.");
}
return(_enumerator.MoveTo(vertex));
}