Re: [boost] Library design Q : overloads v/s default args

Subject: Re: [boost] Library design Q : overloads v/s default args
From: Eric Niebler (eric_at_[hidden])
Date: 2010-06-20 11:18:13

On 6/20/2010 11:00 AM, David Abrahams wrote:
> At Sun, 20 Jun 2010 16:21:14 +0200, Thomas Klimpel wrote:
> 
>> [1] It's not really about "perfect forwarding", but about capturing
>> the non-const rvalue references. This is required for handling calls
>> using adapters like "lapack::syev(bindings::lower(A), w);".
> 
> I'm just curious, Have you thought about using const rvalues as return
> types in these situations?  If you consider the adapter itself to be
> immutable and the target sequence to be a separate object (which in
> reality it is), it actually all makes sense.  And a T const return
> type will bind nicely to a generalized U& argument.

Interesting to hear you recommending this practice. I use it extensively
in Proto but have felt like a bad citizen for doing it because I've
heard that practice proscribed by various experts and committee members.

-- 
Eric Niebler
BoostPro Computing
http://www.boostpro.com