[Boost-users] Spirit inserting values into map

Hello, First of all, I love spirit. I've started using it yesterday and I cannot believe how easy it is. At the moment, I'm trying to parse digits that are supposed to go into a std::map < unsigned int, bool >. On a certain part, if a digits matches, the value /always/ needs to be true. Now, I'm trying to figure out how to statically set the std::map < unsigned int, bool>::value_type that Spirit allows you to assign values to; especially, how can I define that for a certain match, the ->second part should be true, instead of assigning it based on a match of the grammar ? I wasn't able to find this in the manual. I hope I'm making sense... :) Thanks in advance for any responses. Regards, Leon Mergen