Function UpdateNumEngineGroup

src/group_cmd.cpp:273–282

* Update the num engines of a groupID. Decrease the old one and increase the new one * @note called in SetTrainGroupID and UpdateTrainGroupID * @param v Vehicle we have to update * @param old_g index of the old group * @param new_g index of the new group */

 * @param new_g index of the new group
 */
static inline void UpdateNumEngineGroup(const Vehicle *v, GroupID old_g, GroupID new_g)
{
	if (old_g != new_g) {
		/* Decrease the num engines in the old group */
		GroupStatistics::Get(v->owner, old_g, v->type).num_engines[v->engine_type]--;

		/* Increase the num engines in the new group */
		GroupStatistics::Get(v->owner, new_g, v->type).num_engines[v->engine_type]++;
	}
}


const Livery *GetParentLivery(const Group *g)