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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
 =?utf-8?Q?=29?=
 <yannick_duchene@yahoo.fr>
Newsgroups: comp.lang.ada
Subject: Re: Q: type ... is new String
Date: Mon, 04 Jun 2012 09:48:07 +0200
Organization: Ada @ Home
Message-ID: <op.wfdbyh0dule2fv@douda-yannick>
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Date: 2012-06-04T09:48:07+02:00
List-Id: <comp.lang.ada>

Le Mon, 04 Jun 2012 08:30:14 +0200, J-P. Rosen <rosen@adalog.fr> a =C3=A9=
crit:

> Le 04/06/2012 07:58, Yannick Duch=C3=AAne (Hibou57) a =C3=A9crit :
>>    Minimum_Length : constant :=3D <platform dependent>;
>>    Maximum_Length : constant :=3D <platform dependent>;
>>
>>    subtype Index_Type is Natural range Minimum_Length .. Maximum_Leng=
th;
>>
>>    type Path_Type is new String (Index_Type);
>>    -- Unfortunately, this freeze the lower and upper bound, and the
>>    -- declaration below fails.
>>
>>    XYZ_Location : Path_Type :=3D "..................."; -- Will fail.=

> Why not:
> type Path_Type is array (Index_Type range <>) of Character;
>
> ?
> Reminder: There is nothing special to type String, you'll still have
> literals etc.

Good idea. I did not consider this one, may be due to the natural tenden=
cy  =

of deriving from an already existing type with similar meaning.

While I'm OK with this idea and feel it good, I would not apply it,  =

because I would prefer to derive from String. Ada lacks a way to narrow =
 =

the allowed range of a derived array type.

-- =

=E2=80=9CSyntactic sugar causes cancer of the semi-colons.=E2=80=9D [1]
=E2=80=9CStructured Programming supports the law of the excluded muddle.=
=E2=80=9D [1]
[1]: Epigrams on Programming =E2=80=94 Alan J. =E2=80=94 P. Yale Univers=
ity