Re: [AD] Indexed datafiles

[Peter Wang <tjaden@xxxxxxxxxx>]

On 2006-01-05, Elias Pschernig <elias@xxxxxxxxxx> wrote:
> On Fri, 2006-01-06 at 01:50 +1100, Peter Wang wrote:
> > On 2006-01-05, Elias Pschernig <elias@xxxxxxxxxx> wrote:
> > 
> > A compromise may be to ask Allegro users to check for a minimum version
> > of Allegro (from a forwards-compatible series) that their program
> > requires.  We would have to make that check easy to do, of course, but I
> > expect most programs don't need such a check anyway.
> > 
> 
> Aha, so forward compatibility after all, just not strict.

Breaking compatibility actually requires going out of your way and doing
work.  Retaining compatibility is easier...

> Well, what
> about a function: get_allegro_version(int *a, int *b, int *c)
> 
> Then if you want to use e.g. the list_config_entries function, you would
> do:
> 
> get_allegro_version(&a, &b, &c);
> if (!(a >= 4 && b >= 2 && c >= 1))
>    abort_with_error("Need at least Allegro 4.2.1 DLL.\n");
> 
> And otherwise, it would run even with the 4.2.0 DLL.

Well, not quite.  You might want to compile the same code with 4.3.0 and
that would fail unnecessarily.

Peter