[Boost-users] [fusion] how to get the tuple of min values of 2 tuples whatever their length?

I have two tuples: typedef boost::tuple Key; Key k1, k2; I would like to get the tuple of the min values for each corresponding value between k1 and k2: Key min=Key(std::min(k1.get<0>(), k2.get<0>()), std::min(k1.get<1>(), k2.get<1>()), std::min(k1.get<2>(), k2.get<2>())); but I do not know the length of the tuple so I am looking for a generic algorithm... Is this possible with boost::fusion or boost::mpl? I have tried with boost::fusion::accumulate but I need to now in the functor the index of the value that is currently accessed to compare to the right one in k1. Frédéric