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Newsgroups: comp.lang.ada
Date: Mon, 4 Nov 2019 11:16:29 -0800 (PST)
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Subject: Re: How to best make a custom range?
From: Shark8 <onewingedshark@gmail.com>
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Xref: reader01.eternal-september.org comp.lang.ada:57474
Date: 2019-11-04T11:16:29-08:00
List-Id: <comp.lang.ada>

On Monday, November 4, 2019 at 10:56:15 AM UTC-7, Shark8 wrote:
> On Monday, November 4, 2019 at 10:26:22 AM UTC-7, Andrew Shvets wrote:
> > Lets say I have the following code:
> >=20
> > subtype Test_Char is Character range =E2=80=98A=E2=80=99 .. =E2=80=98Z=
=E2=80=99;
> >=20
> > But what if I wanted to include =E2=80=98&=E2=80=99, =E2=80=98@=E2=80=
=98 and =E2=80=98?=E2=80=99 in this custom range of characters as well?  I =
thought of doing the following, but this obviously failed:
> >=20
> > subtype Test_Char is Character range =E2=80=98@=E2=80=98 | =E2=80=98&=
=E2=80=99 | =E2=80=98?=E2=80=99 | =E2=80=98A=E2=80=99 .. =E2=80=98Z=E2=80=
=99;
> >=20
> > Or is this impossible unless I use a different approach?
>=20
>=20
> The approach I've been going with is splitting things apart into parts:
>=20
>   Subtype Upper  is Character range 'A'..'Z';
>   Subtype Lower  is Character range 'a'..'z';
>   Subtype Symbol is Character
>     with Static_Predicate =3D> '&' | '@' | '?';
>=20
>   Subtype Test_Character is Character
>     with Static_Predicate =3D> Upper | Lower | Symbol;
Ah, I forgot the SUBTYPE_NAME IN check, as well as the PREDICATE_FAILURE as=
pect.
Try:

   Subtype Upper  is Character range 'A'..'Z';
   Subtype Lower  is Character range 'a'..'z';
   Subtype Symbol is Character
     with Static_Predicate =3D> Symbol in '&' | '@' | '?';
=20
   Subtype Test_Character is Character
      with Static_Predicate  =3D> Test_Character in Upper | Lower | Symbol,
           Predicate_Failure =3D> Raise Constraint_Error;