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From: "Matthew Heaney" <mheaney@on2.com>
Newsgroups: comp.lang.ada
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Subject: Re: Ada Popularity: Comparison of Ada/Charles with C++ STL (and Perl)
Date: Wed, 29 Sep 2004 11:44:41 -0400
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"Robert Kawulak" <tigrisek@interia.pl> wrote in message
news:cje1hj$jkh$1@nemesis.news.tpi.pl...
>
>     I don't know about Ada, but in C++ you can, and such "templates
nesting"
> is even the recommended way to have multi-dimensional vectors:
>
> typedef vector< vector < vector <int> > > vector_int_3D;

Typically, you'd use a 3-dimensional array:

   type Array_Type is
      array (Positive range <>, Positive range <>, Positive range <>) of
Integer;

Of course, you can pass the type made available via an instantiation of a
generic package as the actual type of some other instantiation.  The
container libraray for Ada 2005 (see AI-302) was specially designed to allow
a container as the element of another container.  So you could say:

package IV is new Ada.Containers.Vectors (Positive, Integer);

package IVV is new A.C.V (Positive, IV.Vector);

package IVVV is new A.C.V (Positive, IVV.Vector);

You'd probably want to declare a local wrapper function to give you a nice
syntax for selecting an element:

   V : IVVV.Vector;

   function E (I, J, K : Positive) return Integer is ...;
begin
   N := E (1, 2, 3);