Andreas Pokorny wrote:
Hi, The default implementation of boost::fusion::pair<first,second> only stores an instance of second. I might need a fusion::pair which does not store that instance either,
If you want a map with *no* runtime data, then you should use mpl::map<>, not fusion::map<>. mpl::map<> uses mpl::pair<>, which has no runtime data. (Caveat: mpl::map is broken in more than one respect at the moment. Hopefully, it'll be fixed soon.)
At first I would like to explain what I am doing right now. At the moment I do work on an expression template framework, similiar to Eric Nieblers boost::proto, which was used to build boost::xpressive.
I do extend that library by adding a rule system which enables the user to define the allowed operations of a certain domain.
Yes, proto needs this. If you're extending proto, I'd gladly accept a patch. -- Eric Niebler Boost Consulting www.boost-consulting.com