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Newsgroups: comp.lang.ada
Date: Mon, 4 Nov 2019 09:56:13 -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:57468
Date: 2019-11-04T09:56:13-08:00
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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 thou=
ght 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?


The approach I've been going with is splitting things apart into parts:

  Subtype Upper  is Character range 'A'..'Z';
  Subtype Lower  is Character range 'a'..'z';
  Subtype Symbol is Character
    with Static_Predicate =3D> '&' | '@' | '?';

  Subtype Test_Character is Character
    with Static_Predicate =3D> Upper | Lower | Symbol;