typedef struct CQueue<>{
    union Data* cQueue;
    union Data* data;


    __code whenEmpty(...);
    __code whenEOF(...);
    __code clear(Impl* cQueue, __code next(...));
    __code put(Impl* cQueue, union Data* data, __code next(...));
    __code take(Impl* cQueue, __code next(union Data* data, ...));
    __code isEmpty(Impl* cQueue, __code next(...), __code whenEmpty(...));
    __code getData(Impl* cQueue, __code next(...), __code whenEOF(...));
    __code next(...);
} CQueue;