Re: Usage of Ada.Streams

["David C. Hoos, Sr." <david.c.hoos.sr@ada95.com>]

Pascal Obry <p.obry@wanadoo.fr> wrote in message
news:863vhk$qje$1@wanadoo.fr...
> David C. Hoos, Sr. a �crit dans le message ...
> >If you want to have the tags in the stream (so that the specific
> >types can be distinguished when reading back), you need to use:
> >Data'Class'Output(Str, Data_Pointer.all);
> >
> >Then, to read them back, you would say:
> >Data_Pointer := new Data'Class'(Data'Class'Input (str));
> >
> >That statement allocates memory for the object, and initializes it
> >with the value read from the stream.
> >
>
> That's correct, but note that it is not necessary to use pointer under
> Ada95.

Agreed.  I only used an access type because the original poster was
writing from a dereferenced access object.

Also, local declare blocks, of course, are more restricted in scope than
dynamically-allocated objects.

Which to use depends on other considerations, but I would probably use
a storage pool if dynamically allocating, especially in a long-running
program reading from, say, a network stream.