Re: [boost] [phoenix] request for a mini-review. (Re: Phoenix as a Boost library)

Subject: Re: [boost] [phoenix] request for a mini-review. (Re: Phoenix as a Boost library)
From: David Abrahams (dave_at_[hidden])
Date: 2010-10-17 06:38:49

At Sun, 17 Oct 2010 13:01:08 +0800,
Joel de Guzman wrote:
> 
> > You could approximate it for up to 3-5 arguments. But you can't actually do it perfectly in C++03 even for 1 argument because you will erase rvalue-ness no matter what.
> 
> Yeah, that's what we do for 03. Let's call it less-than-perfect forwarding.
> It's the best we can do. Right now we have a PP constant for that. Mind you,
> even 3 args is still quite expensive! Then we have 2 more PP constants
> for all refs and another for all const refs.

I think it's only useful to have one of those be higher than the first
PP constant, because you'll just get ambiguities.

-- 
Dave Abrahams
BoostPro Computing
http://www.boostpro.com