----- Mensaje original ----- De: Daniel Wallin <daniel@boost-consulting.com> Fecha: Viernes, Julio 20, 2007 0:11 am Asunto: Re: [Boost-users] [parameter] Parameter-Enabled Class Templates:combining keyword and deduction for the same parameter Para: boost-users@lists.boost.org
David Abrahams wrote:
on Thu Jul 19 2007, "JOAQUIN LOPEZ MU?Z" <joaquin-AT-tid.es> wrote:
Just to be sure: so, given the parameter specification
required<deduced<tag::T>,F>,
Boost.Parameter matches it to T<X> even if X does *not* satisfy F, correct?
That's the intention... although I can't promise SFINAE won't kick in in some cases.
Joaquin was talking about class templates, so the above holds true. SFINAE will kick in if you use the restriction mechanism for function templates. The PP interface does that, so if you use that you can't supply parameter types that doesn't match the predicate.
I've read this over and over and can't say whether you're correcting Dave or me :( excuse my incompetence. So, given (in the context of class template parameters) required<deduced<tag::T>,F>, can Boost.Parameter match it to T<X> even if X does *not* satisfy F? Thank you! Joaquín M López Muñoz Telefónica, Investigación y Desarrollo