Function MaybeAddToTodoSet

src/signal.cpp:237–242

* Perform some operations before adding data into Todo set * The new and reverse direction is removed from Global set, because we are sure * it doesn't need to be checked again * Also, remove reverse direction from Todo set * This is the 'core' part so the graph searching won't enter any tile twice * * @param t1 tile we are entering * @param d1 direction (tile side) we are entering * @para

 * @return false iff the Todo buffer would be overrun
 */
static inline bool MaybeAddToTodoSet(TileIndex t1, DiagDirection d1, TileIndex t2, DiagDirection d2)
{
	if (!CheckAddToTodoSet(t1, d1, t2, d2)) return true;

	return _tbdset.Add(t1, d1);
}


/** Current signal block state flags */