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From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: comp.lang.ada
Subject: Re: Array of Strings
Date: Tue, 23 Sep 2008 07:47:23 -0700 (PDT)
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Date: 2008-09-23T07:47:23-07:00
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mockturtle wrote:
> On Sep 23, 4:07 pm, jedivaughn <jedivaugh...@gmail.com> wrote:
> > If I wanted to make a package that made the array generic how would I
> > go about doing this. this is what I have which isn't working.
> >
> >     generic
> >
> >     type Element_Type is (<>);
> >     type range1 is (<>);
> >
> >    package list is
> >         type letters is private;
> >
> >         private
> >         type letters is array (range1) of Element_Type;
> >
> > end list;
> >
> > and then in the main program I want
> >
> >  subtype range2 is integer range 1..25;
> >  subtype str_length is string (1..25);
> >
> >  package List1 is new List(Element_Type => str_length, range1 =>
> > range2 );
> >
> > when I try to compile the main program I get "expect discrete type in
> > instantiation of "Element_Type""
> >
> > what am I doing wrong?
> >
>
> According to RM 12.5.2 "type Element_Type is (<>);" means that
> Element_Type
> is a discrete type.  I guess that you want something like
> "type Element_Type is private;" (I did not check)

That's correct.

To the OP: out of curiosity, why don't you use Ada.Containers.Vectors?
Even if you have good reason not to use this package, you will benefit
from reading its spec as a source of inspiration (aka "best
practices").

Also see http://en.wikibooks.org/wiki/Ada_Programming/Generics

--
Ludovic Brenta.