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From: franke@minet.uni-jena.de (Frank Ecke)
Subject: Re: How to initiate part of a string?
Date: 1998/08/26
Message-ID: <slrn6u8a87.7n2.franke@pax10f.mipool.uni-jena.de>#1/1
X-Deja-AN: 384941010
References: <35E171AB.75CD@ddre.dk> <35E41EF7.7FC9309F@elca-matrix.ch>
Organization: Friedrich-Schiller-University Jena, Germany
Reply-To: franke@minet.uni-jena.de
Newsgroups: comp.lang.ada
Date: 1998-08-26T00:00:00+00:00
List-Id: <comp.lang.ada>

On Wed, 26 Aug 1998 16:43:09, Mats Weber <Mats.Weber@elca-matrix.ch> wrote:

>If the value, and especially the length, of that string is going to change,
>then String(1 .. 100) is a very bad type to use. Instead, you should use one
>of the varying length string packages Ada.Strings.Bounded and Ada.Strings.
>Unbounded.
>
>Example:
>
>with Ada.Strings.Unbounded;
>
>use Ada.Strings.Unbounded;
>
>package Globals is
>   Txt : Unbounded_String := To_Unbounded_String("bla bla bla");
>end Globals;
>
B
>This way, you need no package body, and you can easily change the value if Txt
>later on.

Of course, unbounded strings provide more flexibility but I think Hans'
intention was to provide an initial value for a *slice* of Txt.  Your proposal
seems to only initialize a ``special slice'' of Txt, namely
Txt(1 .. Length("bla bla bla")).

Using unbounded strings, I suggest:

Txt : Unbounded_String :=
  Replace_Slice(100 * Space, 50, 54, "Hello");


or, as suggested by Hans:

Txt : Unbounded_String :=
  Overwrite(100 * Space, 5, "No need to count");


Regards,

Frank