David Abrahams wrote:

Are customizable fusion functions such as begin(s) supposed to be called with or without qualification? I.e. do you expect them to be found via ADL or by other means?

I think they should be called with qualification to allow for 3rd party sequences (e.g. std::pair, mpl::vector). Regards, -- Joel de Guzman http://www.boost-consulting.com http://spirit.sf.net