Re: array of operations

["Randy Brukardt" <randy@rrsoftware.com>]

Ehud Lamm wrote in message ...
>
>"Ole-Hjalmar Kristensen" <oleh@vlinux.voxelvision.no> wrote in message
>news:7vfzwh9dkl.fsf@vlinux.voxelvision.no...
>
>> Or a pointer to an object and let the dispatching mechanism implement
>> the function pointer behind the scenes.
>
>This indeed another useful technique. However, there are some small
gotchas.
>You can usually use singleton objects, but in many cases you will need
>access values so you have to make them "aliased."


Not true. Since it is always OK to take 'Unchecked_Access of a parameter
of a tagged type in Ada 95, you generally do not need to explicitly use
"aliased". Claw uses this extensively to provide an interface which is
mostly without access types, yet internally everything is linked
together. (Claw uses finalization to prevent dangling pointers in this
case).

There are very few 'aliased' tagged objects in the Claw sample programs
(3 in 74 samples).

                  Randy Brukardt.