Method wait_and_pop

include/LabSound/core/ConcurrentQueue.h:49–59

    }

    void wait_and_pop(Data & popped_value)
    {
        std::unique_lock<std::mutex> lock(the_mutex);
        while (the_queue.empty())
        {
            the_condition_variable.wait(lock);
        }

        popped_value = the_queue.front();
        the_queue.pop();
    }
};
}