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Newsgroups: comp.lang.ada
Subject: Re: Array of Strings
References: <fda9aa48-6029-469e-82fb-20bb99d750c6@73g2000hsx.googlegroups.com>
From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Date: Sat, 13 Sep 2008 16:32:54 +0200
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Date: 2008-09-13T16:32:54+02:00
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jedivaughn <jedivaughn14@gmail.com> writes:
> Hi everyone,
>
> I'm having trouble making a array of type string. can some one show me
> how to do this. I've tried type letters is array (Integer range <>) of
> String; but I get error "unconstrained element type in array
> declaration". what am I doing wrong?

The type String is unconstrained because you don't know the size of
the strings at compile time.  Therefore you cannot put Strings in an
array.  You can however create:

- an array of fixed-size strings; for this you need a subtype e.g.

subtype Constrained_String is String (1 .. 10);
type Array_Of_Constrained_Strings is
  array (Positive range <>) of Constrained_String;

- an array of access values to Strings e.g.

type String_Access is access String;
type Array_Of_String_Accesses is array (Positive range <>) of String_Access;

(!this is the most error-prone method!)

- an array of Ada.Strings.Unbounded.Unbounded_Strings e.g.

type Array_Of_Unbouded_Strings is
  array (Positive range <>) of Ada.Strings.Unbounded.Unbounded_String;

- an array of Ada.Strings.Bounded.Bounded_Strings similar to the above
  but you also need to specify the maximum size

HTH

-- 
Ludovic Brenta.