I found the answer meanwhile. Peter #include <boost/mpl/set.hpp> #include <boost/mpl/sort.hpp> #include <boost/mpl/inserter.hpp> #include <boost/mpl/insert.hpp> #include <boost/mpl/placeholders.hpp> #include <boost/mpl/front.hpp> #include <boost/mpl/deref.hpp> #include <boost/mpl/for_each.hpp> #include <iostream> typedef boost::mpl::set< boost::mpl::int_<1>, boost::mpl::int_<5>, boost::mpl::int_<3>, boost::mpl::int_<0> > CSet; typedef boost::mpl::inserter< boost::mpl::set<>, boost::mpl::insert<boost::mpl::_1, boost::mpl::_2>

CInserter;

typedef boost::mpl::sort< CSet, boost::mpl::less< boost::mpl::_1, boost::mpl::_2 >, CInserter

::type COrderedSet;