[Boost-users] Re: mpl::sequence question

"Martin Pasdzierny" wrote [...]

// here is my type list typedef mpl::vector my_types;

// from_pos and to_pos are start and end iterators of the subsequence typedef typename mpl::find::type from_pos; typedef typename mpl::find::type to_pos;

// all elements (types) of my_types should be copied into the new seuqence my_sub_types if their iterator (index) is inside the given interval (from_pos,to_pos) typedef mpl::copy_if::type, mpl::int_ > , mpl::less< mpl::find::type, mpl::int_ >

...

, mpl::back_inserter< mpl::vector<> > ::type my_sub_types;

</code>

This code (and lots of slight variations) does not compile. Why ?

Most likely because mpl::greater, etc., are defined to work with integral constants, not with iterators. I think you should just use iterator_range: typedef mpl::iterator_range::type my_sub_types; HTH, Arkadiy