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From: deadlyhead <deadlyhead@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Determining value of record discriminant
Date: Mon, 19 Jul 2010 17:33:49 -0700 (PDT)
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Date: 2010-07-19T17:33:49-07:00
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On Jul 19, 5:26=A0pm, "Jeffrey R. Carter"
<spam.jrcarter....@spam.acm.org> wrote:
> On 07/19/2010 03:36 PM, deadlyhead wrote:
>
>
>
>
>
> > -- =A0code begins
> > type Discrim_Val is (Int, Str);
>
> > type Discrim_Rec (D : Discrim_Val) is record
> > =A0 =A0 case D is
> > =A0 =A0 =A0 =A0when Int =3D>
> > =A0 =A0 =A0 =A0 =A0 Val_Int : Integer :=3D 1_000_000;
> > =A0 =A0 =A0 =A0when Str =3D>
> > =A0 =A0 =A0 =A0 =A0 Val_Str : String (1 .. 11) :=3D "One million";
> > =A0 =A0 end case;
> > end record;
> > -- =A0code ends
>
> > Is there any way to determine what the discriminant value was on a
> > type later on, i.e. with a dynamically allocated Discrim_Rec object
> > created with user input for D? =A0A haven't found anything looking
> > through the RM about attributes or anything providing this
> > functionality.
>
> V : Discrim_Rec :=3D Some_Func;
>
> case V.D is
> when Int =3D>
> =A0 =A0 ...
> when Str =3D>
> =A0 =A0 ...
> end case;
>
> The discriminant is a field just like any other.
>
> --
> Jeff Carter
> "How'd you like to hide the egg and gurgitate
> a few saucers of mocha java?"
> Never Give a Sucker an Even Break
> 101

Thank you!  I really don't know how I missed that.