[LAD] Inter thread Communication: Design Approach

[David Robillard]

On Thu, 2011-09-01 at 21:29 -0500, Gabriel Beddingfield wrote:
> On 09/01/2011 01:18 PM, David Robillard wrote:
> >
> > The main issue you'll find with going the C++/RTTI route is that #2 no
> > longer is possible, since virtual objects are not POD, so you can't
> > safely write them through a ringbuffer (or copy them around manually in
> > general).
> [snip]
> 
> Correct me if I'm wrong... but...
> 
> >>       class event_two_t : public event_t
> >>       {
> >>       public:
> >>           int type() { return int(EVENT_TWO); }
> >>           uint32_t size() { return sizeof(event_two); }
> >>
> >>           /* event-specific stuff */
> >>       };
> 
> The intention of the size() member function is to allow you to memcpy() 
> the object without knowing its type.  Is that not enough?

Because it uses inheritance, this object is not POD, so strictly
speaking no.

-dr