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From: "Matthew Heaney" <mheaney@on2.com>
Newsgroups: comp.lang.ada
Subject: Re: Beginer problem: variable array size
Date: Wed, 2 Oct 2002 11:04:04 -0400
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Date: 2002-10-02T11:04:04-04:00
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"Nacho" <NACHANGA@terra.es> wrote in message
news:am26u4$d2q$1@nsnmpen2-gest.nuria.telefonica-data.net...
> I am learning ada and i have to implement an array of unknown size until
> rutime.
> The array must be resizable at runtime. This is easy to achieve for me in
> other lenguajes like c++, but i am new to ada and i don't know hot to
> resolve the problem. The solution in c++ code could be:
[snipped]
> How can I do the same in ada?
> How can I use dinamics arrays of variable size in ada?

The Charles container library comes with a vector data structure that does
this sort of thing, e.g.

package Integer_Vectors is new Charles.Vectors.Unbounded (Integer);
subtype Vector_Subtype is Integer_Vectors.Container_Type;
use Integer_Vectors;

V : Vector_Subtype := To_Container (Length => 50);
...
V := To_Container (Length => 80);
--or--
Assign (V, Length => 80);

If you're comfortable with the C++ STL, then using Charles will be natural.

http://home.earthlink.net/~matthewjheaney/charles/index.html

There's also a deque container type, which allows insertions at the front of
the container.