How to results array properly

pipe.cpp

class PipeExampleModule : public Module {
    ...
    union {
        struct pipe_results pr;
        struct pipe_results2 pr2;
        struct pipe_results3 pr3;
    } results[NUMBER_PIPES];
    ...
    // Nothing needed in constructor or destructor
    ...
    
    Status process_image(Image *image) {
        ...
        for (uint i = 0; i < NUMBER_PIPES; i++){
            memset(&results[i], 0, sizeof(struct pipe_results));
            ...
            results[i].pr.center_x = box.center.x;
            results[i].pr.center_y = box.center.y;
            ...
        }
        ...
        shm_setg(pipe_results, results[0].pr);
        shm_setg(pipe_results2, results[1].pr2);
        shm_setg(pipe_results3, results[2].pr3);
        ...
    }