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From: Matthew Heaney <mheaney@on2.com>
Newsgroups: comp.lang.ada
Subject: Re: Containers - nontrivial element access
Date: Thu, 04 Oct 2007 14:58:16 -0700
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Date: 2007-10-04T14:58:16-07:00
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On Oct 4, 9:01 am, Georg Bauhaus <rm.tsoh+bauh...@maps.futureapps.de>
wrote:
>
> Why not strive for something like
>
>    swap_salary(c1, c2);
> where
>    c1, c2: Cursor;

This is not quite right, since you need a variable view of the
container.  You'll have to do something like:

swap_salary(v, c1, c2);

If you want to generalize:

generic
   with package VT is new Vectors (<>);
procedure Generic_Update_Elements
  (V : in out Vector;
   C1, C2 : Cursor,
   Process : access procedure (E1, E2 : in out ET));

So you could say:

procedure Update_Elements is
  new Generic_Update_Elements (People_Vectors);

procedure Swap_Elements (E1, E2 : in out ET);

Update_Elements (V, C1, C2, Swap_Elements'Access);

Of course, you could also pass in Swap_Elements as a generic actual.