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Newsgroups: comp.lang.ada
Subject: Re: Efficiency of returning big objects
From: Georg Bauhaus <bauhaus@futureapps.de>
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Date: Mon, 25 Sep 2006 17:24:42 +0200
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Date: 2006-09-25T17:18:34+02:00
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On Mon, 2006-09-25 at 14:14 +0200, Alex R. Mosteo wrote:

> Some_Map.Element (Key).Method_Or_Member

Could you consider using Query_Element as an efficient
alternative? Or Update_Element if Method modifies.


> So, what do you think? Is there some error in my reasoning or testbed? Is
> this a particular shortcoming of this compiler (gnat gpl 2006), or I'm
> overlooking something that makes this very non-trivial to implement?

Making T limited reveals a few things:

Compiling: ref.adb (source file time stamp: 2006-09-25 15:22:05)

    23.       return Borg;
                     |
        >>> (Ada 2005) cannot copy object of a limited type (RM-2005 6.5(5.5/2))
        >>> return by reference not permitted in Ada 2005
        >>> consider switching to return of access type

    51.       if Create.X /= 0 then
                 |
        >>> (Ada 2005) limited function call in this context is not yet implemented




-- Georg