Function FillNewGRFVehicleCache

src/newgrf_engine.cpp:1419–1443

* Fill the grf_cache of the given vehicle. * @param v The vehicle to fill the cache for. */

 * @param v The vehicle to fill the cache for.
 */
void FillNewGRFVehicleCache(const Vehicle *v)
{
	VehicleResolverObject ro(v->engine_type, v, VehicleResolverObject::WO_NONE);

	/* These variables we have to check; these are the ones with a cache. */
	static const int cache_entries[][2] = {
		{ 0x40, NCVV_POSITION_CONSIST_LENGTH },
		{ 0x41, NCVV_POSITION_SAME_ID_LENGTH },
		{ 0x42, NCVV_CONSIST_CARGO_INFORMATION },
		{ 0x43, NCVV_COMPANY_INFORMATION },
		{ 0x4D, NCVV_POSITION_IN_VEHICLE },
	};
	static_assert(NCVV_END == lengthof(cache_entries));

	/* Resolve all the variables, so their caches are set. */
	for (const auto &cache_entry : cache_entries) {
		/* Only resolve when the cache isn't valid. */
		if (HasBit(v->grf_cache.cache_valid, cache_entry[1])) continue;
		bool stub;
		ro.GetScope(VSG_SCOPE_SELF)->GetVariable(cache_entry[0], 0, stub);
	}

	/* Make sure really all bits are set. */
	assert(v->grf_cache.cache_valid == (1 << NCVV_END) - 1);
}