/// <summary>
/// Indicate that the edge connecting the vertices u and v forms a ring.
/// </summary>
/// <param name="u">a vertex</param>
/// <param name="v">a vertex connected to u</param>
/// <param name="b">bond type connecting u to v</param>
private void CyclicEdge(int u, int v, Bond b)
{
RingClosure r = new RingClosure(u, v, b);
AddRing(r.u, r);
AddRing(r.v, r);
}
/// <summary>
/// Add a ring closure to the the vertex 'u'.
/// </summary>
/// <param name="u"> a vertex</param>
/// <param name="rc">ring closure</param>
private void AddRing(int u, RingClosure rc)
{
if (!rings.TryGetValue(u, out IList <RingClosure> closures))
{
if (closures == null)
{
closures = new List <RingClosure>(2);
rings.Add(u, closures);
}
}
closures.Add(rc);
}
