update_bullets

void MyViewer::update_bullets() {
    int i = 0;
    bullet_list = bullet::getList();
    for (std::vector<bullet *>::iterator it = bullet_list.begin(); it != bullet_list.end(); ) {
        for (std::vector<collision *>::iterator it_b = buildings.begin(); it_b != buildings.end(); ++it_b) {
            if ((*it_b)->contains((*it)->getPos(), 0.05f)) {
                (*it)->setAge(1500000);
            }
        }
        if ((*it)->getAge() > 150) {
            bullet_group->remove(i + 1);
            it = bullet_list.erase(it);
        }
        else {
            (*it)->update();
            ++it;
        }
        ++i;
    }
    bullet::setList(bullet_list);
}