Re: Multiple task bodies for one task type?

[Tucker Taft <stt@avercom.net>]

John McCabe wrote:
> 
> On Sat, 15 Sep 2001 00:26:01 GMT, Darren New <dnew@san.rr.com> wrote:
> 
> If I understand yuo correctly, what you want is a heterogeneous array
> of tasks. If that is the case, I don't believe it is supported by Ada
> as the task type is not extendable.

You could define a limited tagged type, and include a task body
in each extension.  You would need some primitive operations to
interface with the entries of the task.  An access-to-LT'Class type
could be used for passing these around conveniently, where LT is
the limited tagged type.

> ...
> You may be able to implement someting like this using a discriminant
> on the task type. You would have to include all possible variations on
> the code within a case statement in the task. There may be other ways
> of course!

The tagged type mechanism is more easily extensible, though the
interface to the task must be through primitive operations,
rather than directly with entries.

> 
> Hope this helps.

-- 
-Tucker Taft   stt@avercom.net   http://www.avercom.net
Chief Technology Officer, AverCom Corporation (A Titan Company) 
Bedford, MA  USA (AverCom was formerly the Commercial Division of AverStar:
http://www.averstar.com/~stt)