Use comparison operator for NewGRFCache instead of memcmp

src/openttd.cpp

@@ -1830,7 +1830,7 @@ void CheckCaches(bool force_check, std::function<void(const char *)> log, CheckC
 			length = 0;
 			for (const Vehicle *u = v; u != nullptr; u = u->Next()) {
 				FillNewGRFVehicleCache(u);
-				if (memcmp(&grf_cache[length], &u->grf_cache, sizeof(NewGRFCache)) != 0) {
+				if (grf_cache[length] != u->grf_cache) {
 					CCLOGV("newgrf cache mismatch");
 				}
 				if (veh_cache[length].cached_max_speed != u->vcache.cached_max_speed || veh_cache[length].cached_cargo_age_period != u->vcache.cached_cargo_age_period ||

src/vehicle_base.h

@@ -87,6 +87,8 @@ struct NewGRFCache {
 	uint32_t company_information;       ///< Cache for NewGRF var 43.
 	uint32_t position_in_vehicle;       ///< Cache for NewGRF var 4D.
 	uint8_t  cache_valid;               ///< Bitset that indicates which cache values are valid.
+
+	bool operator==(const NewGRFCache&) const = default;
 };
 
 /** Meaning of the various bits of the visual effect. */