Re: [Boost-users] [phoenix] ambiguity between std::begin/end and phoenix::begin/end due to ADL

On 12/16/2011 5:44 PM, Nathan Ridge wrote:

Hello,

I am running into a problem where an unqualified call to begin() on a range type whose template parameters include a Boost.Phoenix type (for examle filtered_range where Pred is a phoenix function) is ambiguous because, in addition to the intended std::begin, phoenix::begin is being found by ADL.

What can be done about this? There exists precedent for placing boost::xxx::begin/end functions in ADL barrier namespaces because C++11 encourages unqualified calls to begin/end (specifically, this was done for boost::range::begin/end). Should the same thing be done for Phoenix?

Yep. Heller seems to be on vacation now. It would be good to have a trac ticket for this, to be sure we won't forget. Regards, -- Joel de Guzman http://www.boostpro.com http://boost-spirit.com