On Fri, Apr 19, 2013 at 10:49 AM, Olaf Peter <ope-devel@gmx.de> wrote:

must be mpl::vector<
mpl::vector< ...

Right :)

Thanks, now I want to find the maximum over all, but I've got lost. I got it working for

typedef mpl::vector_c<std::size_t,
0, // undefined,
4, // foo,
7 // bar,
> arity_info;

struct max_arity
: mpl::deref<
mpl::max_element<arity_info>::type
>::type
{ };

but not here with the vector<vector<>> :(

Sorry, you might have to be more specific? I'll give it a shot though. I would think some combination of mpl::max_element (as you have above) with mpl::transform (which transforms your vector<vector<...>> to a vector<...> of the at_c<1>'s of the inner vector<...>s) might be what you want, but not sure.

Alternatively, you can call mpl::max_element on the original vector<vector<...>> nested sequence directly, using a custom comparator, then extract at_c<1> of the (deref'ed) result.

If this is what want but you can't get either or both of the above to work, holler back.

HTH,

- Jeff