#include #include <iostream> #include #include #include typedef boost::mpl::map< boost::mpl::pair< boost::mpl::int_<0>, boost::mpl::int_<3> >, boost::mpl::pair< boost::mpl::int_<1>, boost::mpl::int_<2> >, boost::mpl::pair< boost::mpl::int_<2>, boost::mpl::int_<1> >, boost::mpl::pair< boost::mpl::int_<3>, boost::mpl::int_<0> >

CMapForward;

typedef boost::mpl::map< boost::mpl::pair< boost::mpl::int_<0>, boost::mpl::int_<3> >, boost::mpl::pair< boost::mpl::int_<1>, boost::mpl::int_<2> >, boost::mpl::pair< boost::mpl::int_<2>, boost::mpl::int_<1> >, boost::mpl::pair< boost::mpl::int_<3>, boost::mpl::int_<0> >

CMapReverse;

template struct CCreatePair:boost::mpl::pair > { }; struct CDoSomething { template inline void operator()(const boost::mpl::pair &_r) const { std::cout << INDEX0 << " " << INDEX1 << "\n"; } }; int main(int, char**) { boost::mpl::for_each< CMapForward, template CCreatePair >(CDoSomething()); return 0; } "The first point (using an init() function in preference to a constructor) is bogus. Using constructors and exception handling is a more general and systematic way of dealing with resource acquisition and initialization errors. This style is a relic of pre-exception C++." -- Stroustrup