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From: Justin M. Lewis (boost_at_[hidden])
Date: 2003-05-04 17:50:46

----- Original Message -----
From: "Noel Yap" <Noel.Yap_at_[hidden]>
To: "Boost mailing list" <boost_at_[hidden]>
Sent: Sunday, May 04, 2003 3:47 PM
Subject: Re: [boost] Re: in/out parameters, codingstylesandmaintenance

> "Justin M. Lewis" wrote:
> > Again, you're addressing the specifics of an example, rather than the
> > itself. You can see the point, and you have to realize that in real
> > situations come up where you have an object that can't be copied, but
> > still want to use, and pass around to functions.
> Again, the point is that out parameters aren't necessary. You and
> others may see a lot of them in your code. IMHO, without seeing the
> rationale behind the decision, the code you see is messy because of the
> out parameters. I also think this is why you're having such a hard time
> tracking down variable changes.
> For example:
> double d = sqrt( x );
> is much easier to comprehend than:
> sqrt( x, d );
> You seem to want to band-aid the latter with:
> sqrt( in( x ), out( d ) );

Not at all. I wouldn't use out params for trivial things like that. Out
params are necessary where the cost of copying the object is too expensive,
or where copying the object isn't possible (non-copyable objects,
polymorphic objects, any large object).

> which will, indeed make it a little clearer, but I think it's still not
> better than the former.
> Noel
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