Hi All, What is the current status of compile time fractions / rationals? Various directions are 1 Alexei Gurovois in boost/mpl/math/rational_c.hpp 2 Cromwell Enages work on the files section <http://groups.yahoo.com/group/boost/files/mpl_math.zip> 3 Hugo Duncans: http://tinyurl.com/2qrpq However the three are not compatible with each other In Cromwells (named fraction_c) and Hugo Duncans the numerator and denominator are mpl Integral Constants not values, as in Alexeis original. mpl::rational_c<int,1,2>::denominator; // == 2 against mpl::rational_c<int,1,2>::denominator::value; == 2 Cromwell's version is not a nullary_metafunction whereas Hugo Duncans and Alexeis are. This is the right thing IMO because the type can be reduced eg 2/2 ---> 1, Also see http://lists.boost.org/MailArchives/boost-users/msg06245.php I appreciate that there my be advantages to Cromwells and Hugo Duncans versions.. Ultimately either the version in the release should be removed/ modified or 'lived with'. Anyone have any thoughts. And is anyone still working on this? regards Andy Little