The way I look at it, the default descriminant is a way of telling the
compiler you may want to assign a record with a different discriminant value
to a record you have declared.  That way enough memory is allocated to hold
the largest variant.  If you don't give a default descriminant, that tells
the compiler you're going to explicitly select the variant for each record
you declare, so it can size each variant in the smallest allocation - with
the restriction that you cannot assign a different variant after the
declaration.

I hope this helps,
Steve
(The Duck)


"Bj�rn Persson" <spam-away@nowhere.nil> wrote in message
news:JoO0c.84716$dP1.234457@newsc.telia.net...
Thank you, Steve and Robert! I'm afraid I still don't understand why
Parameter_Wrapper would be necessary, since Steve's solution seems to
work equally well - at least in Gnat 3.3.2. On the other hand I don't
understand why a default value for the discriminant would make such a
difference - but it does.

-- 
Bj�rn Persson

jor ers @sv ge.
b n_p son eri nu