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From: Lutz Donnerhacke <lutz@iks-jena.de>
Newsgroups: comp.lang.ada
Subject: Re: += in ada
Date: Fri, 17 Oct 2003 14:40:10 +0000 (UTC)
Organization: IKS GmbH Jena
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Date: 2003-10-17T14:40:10+00:00
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* Hyman Rosen wrote:
> No, you are forgetting that these operators are intended to
> be defined for all sorts of types, where the temporaries may
> be very large data structures, such as matrices.

Ada provides 'in out' parameters of procedures for that purpose.

> Anyway, I'm not an Ada programmer, so I don't really care if
> Ada has these operators or not. If I had to do stuff like this
> in Ada, I would just write the appropriate procedures and be
> done with it.

Please simply do this:
 procedure Mult_To_Left(target : in out Matrix; factor : in Matrix);

> In C++, I use these operators all the time.

You should stick to normal programming. It's much more funny than dealing
with one syntatic element all the time.

> I just did a quick search through the source code we've added to out
> trading system and counted around 500 uses of augmented assignment
> operators (+=, -=, *=, /=), and yes, we actually do have a few cases of
> /=. We also have a few of those complicated left-hand sides that people
> talk about; here's one:
> 
>      (*fxMap)[exposure.secCurr.id().get_key()] += exposure.secExp;

declare
   fxExp : Fx_Type renames fxMap(exposure.secCurr.id.get_key);
begin
   fxExp := fxExp + exposure.secExp;
end;

So what's your point?

Ah! Multiple lines:
  procedure Add (to: in out Fx_Type; term : in Fx_Type) is
  begin
     to := to + term;
  end add;

[...]
  Add(to => fxMap(exposure.secCurr.id.get_key), term => exposure.secExp);
  Add(fxMap(exposure.secCurr.id.get_key), exposure.secExp);
  
Have fun.