Hourglass Interfaces for C++ APIs(slideshare.net)

    size_t hairpoll_size() { return sizeof(Poll); }
    void hairpoll_construct(void *mem, char const *person) { new (mem) Poll(person); }
    void hairpoll_destruct(void *mem) { ((Poll *)mem)->Poll::~Poll(); }

    void *poll_reusable = malloc(hairpoll_size());
    while (a long time) {
        char const *person = get_person_name();
        hairpoll_construct(poll_reusable, person);
        // use the hairpoll
        hairpoll_destruct(poll_reusable);
    }
    free(poll_reusable);