On 1/13/2012 9:35 PM, Andy Venikov wrote:
struct alien { std::string color_; std::string planet_; bool benevolent_; };
BOOST_FUSION_ADAPT_STRUCT( alien, (std::string, color_) (std::string, planet_) (bool, benevolent_) )
I know how I can get to the actual member values, i.e. I could check at<2>(anAlien) to see if I should run away or not. But what if I wanted to get to the member names? (In this example it would be "color_", "planet_" and "benevolent_") It could be very useful for example for serialization that stores not just values but also the names of the values. Printing structures to stdout for inspection would be a breeze too. Since BOOST_FUSION_ADAPT_STRUCT is a macro, surely the member names could be strigized and stored somewhere.
The following is yet undocumented but has been stable for many years now: boost::fusion::extension::struct_member_name<alien , N>::call() where N is the index, will give you the name of the member. Ideally, we need a fusion namespace level function for easy access to this. It's reasonable to add something like: boost::fusion::member_name_at_c<N>(anAlien); for consistency with at_c, value_at_c, etc. It would be easy to add those functions in the adapted module. Would you like to volunteer creating a patch? Regards, -- Joel de Guzman http://www.boostpro.com http://boost-spirit.com