gistfile1.ec

class TopoEdge : struct
{
   Link in, out;
   External from, to;
   bool breakable;
};

class External
{
   public const char * output;

   LinkList<TopoEdge, out> outgoing { };
   LinkList<TopoEdge, in> incoming { };
}

class FunctionExternal : External
{
}

class DeclarationExternal : External
{
}

void CreateEdge(External from, External to, bool soft)
{
   TopoEdge e { from = from, to = to, breakable = soft };
   from.outgoing.Add(e);
   to.incoming.Add(e);
}