[boost] Re: passing temporaries to mutating algorithms

From: Thorsten Ottosen (nesotto_at_[hidden])
Date: 2004-04-12 21:50:06

"David Abrahams" <dave_at_[hidden]> wrote in message
news:uvfk47i7y.fsf_at_boost-consulting.com...
> "Thorsten Ottosen" <nesotto_at_[hidden]> writes:
>
> > "David Abrahams" <dave_at_[hidden]> wrote in message
> > news:uzn9hcgip.fsf_at_boost-consulting.com...
> > [snip]
> >> Seems like this would be more useful.
> >
> > Perhaps. Do you care to explain why?
>
> It works generically on lvalues and rvalues, so that if someone hands
> you a function object f, and some_algo is more efficient when it can
> modify its first argument in-place, you can do
>
>     some_algo( mutate_rvalue(f(),0), x );

yeah, definitely an improvement, although I wish there was some way of
putting a static assertion in there. The new error message is a lot worse.

br

Thorsten