static VertexStore GetFreeVxs()
{
if (s_vxsPool == null)
{
s_vxsPool = new Stack <VertexStore>();
}
if (s_vxsPool.Count > 0)
{
return(s_vxsPool.Pop());
}
else
{
VertexStore vxs = new VertexStore();
VertexStore.SetSharedState(vxs, true);
return(vxs);
}
}
