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Date: Fri, 17 Oct 2003 11:40:26 -0400
From: Hyman Rosen <hyrosen@mail.com>
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Subject: Re: += in ada
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Date: 2003-10-17T11:40:26-04:00
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Lutz Donnerhacke wrote:
> Please simply do this:
>  procedure Mult_To_Left(target : in out Matrix; factor : in Matrix);

Yes, that's what I said.

>>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 don't understand this sentence at all. What do you mean?

> So what's your point?

I don't have a point, exactly. I was just pointing out that the
augmented assignment operators are used very frequently in normal
C++ code, and some of those uses involve those complicated left
side expressions. This is real production code, not a made-up
example. I think some people here believe that such an operator
is a rara avis that even if available would be rarely used.

 > declare
 >    fxExp : Fx_Type renames fxMap(exposure.secCurr.id.get_key);
 > begin
 >    fxExp := fxExp + exposure.secExp;
 > end;
 >
And now that you mention it, there's a considerable problem with
the renames idiom; you must repeat the type of the thing you're
renaming.

> 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.

I would hope that you at least use a generic instantiation instead of
littering your code all over the place with little bird droppings.