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From: Robert A Duff <bobduff@shell01.TheWorld.com>
Newsgroups: comp.lang.ada
Subject: Re: discriminant questions
Date: Sun, 18 Sep 2011 12:46:19 -0400
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Date: 2011-09-18T12:46:19-04:00
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"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:

> I am not sure if Ada 2012 offers new features interesting for designers of
> container libraries. OK, maybe one, functions have finally got [in] out
> parameters.

There's a whole bunch of stuff.  Look at these AI's:

AI05-0139-2.TXT : !subject Syntactic sugar for accessors, containers, and iterators
AI05-0142-4.TXT : !subject Explicitly aliased parameters
AI05-0143-1.TXT : !subject In Out parameters for functions
AI05-0162-1.TXT : !subject Allow incomplete types to be completed by partial views
AI05-0212-1.TXT : !subject Accessors and Iterators for Ada.Containers

The stuff you need to know for writing containers is pretty arcane.
But the use of containers becomes much simpler.
For example, you can say things like:

    A(X).Y := A(X).Y + 1;

whether A is an array or a Vector.

- Bob