Method GetID

src/engine.cpp:529–536

* Looks up an EngineID in the EngineOverrideManager * @param type Vehicle type * @param grf_local_id The local id in the newgrf * @param grfid The GrfID that defines the scope of grf_local_id. * If a newgrf overrides the engines of another newgrf, the "scope grfid" is the ID of the overridden newgrf. * If dynamic_engines is disabled, all newgrf share the same ID scop

 * @return The engine ID if present, or EngineID::Invalid() if not.
 */
EngineID EngineOverrideManager::GetID(VehicleType type, uint16_t grf_local_id, uint32_t grfid)
{
	const auto &map = this->mappings[type];
	const auto key = EngineIDMapping::Key(grfid, grf_local_id);
	auto it = std::ranges::lower_bound(map, key, std::less{}, EngineIDMappingKeyProjection{});
	if (it == std::end(map) || it->Key() != key) return EngineID::Invalid();
	return it->engine;
}

/**
 * Look for an unreserved EngineID matching the local id, and reserve it if found.