Boost logo

Boost :

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

Boost list run by bdawes at, gregod at, cpdaniel at, john at