/**
* iterates through all the edges in the graph and removes any that point
* to an invalidated node
*/
private void CullInvalidEdges()
{
foreach (EdgeList EL in edges)
{
var node = EL.First;
while (node != null)
{
var next = node.Next;
if (Nodes[node.Value.to].index == NT.INVALID_NODE_INDEX ||
Nodes[node.Value.from].index == NT.INVALID_NODE_INDEX)
{
EL.Remove(node);
}
node = next;
}
}
}