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From: 18k11tm001@sneakemail.com (Russ)
Newsgroups: comp.lang.ada
Subject: Re: Ideas for Ada 200X
Date: 4 Jun 2003 15:38:22 -0700
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Stephen Leake <Stephe.Leake@nasa.gov> wrote in message news:<uadcxwzhi.fsf@nasa.gov>...
> 18k11tm001@sneakemail.com (Russ) writes:
> 
> > > (And let's not forget that Ada *can* compute the result matrix in-place,
> > > just not using the notation you prefer. It's a strange performance-oriented
> > > programmer who gives up a factor of 4 for aesthetic reasons.)
> > 
> > But Mr. Duff says that "+=" is just "syntactic sugar" for "Add(A,B),"
> 
> Mr. Duff forgot about the Constraint_Error issues.
> 
> > and Mr. Eachus says "+=" needs a temporary to preserve A in the case
> > of a Constraint_Error. 
> 
> He's right, since the language defines that behavior. But since _you_
> write "Add", you get to decide what happens for Constraint_Error, so
> you _don't_ need a temporary.

I think you're missing something here. I would write "+=" too.