Method DEFINE_VMETHOD_INTERPOSE

plugins/steam-engine.cpp:538–544

Furnaces need architecture, and this is a workshop only because furnaces cannot connect to machines.

    // Furnaces need architecture, and this is a workshop
    // only because furnaces cannot connect to machines.
    DEFINE_VMETHOD_INTERPOSE(bool, needsDesign, ())
    {
        if (get_steam_engine())
            return true;

        return INTERPOSE_NEXT(needsDesign)();
    }

    // Machine interface
    DEFINE_VMETHOD_INTERPOSE(void, getPowerInfo, (df::power_info *info))