"Jaap Suter" <boost@jaapsuter.com> writes:
I was trying to use mpl::contains with list_c and it always seems to return mpl::false_.
For example typedef mpl::list_c< int ,16,8 > mylist; typedef mpl::contains<mylist, mpl::int_<16> >::type tt;
I've run into this issue in the past as well, and I vaguely rememember seeing mpl::integral_c<long>'s being used somewhere along the way, instead of mpl::integral_c<int>'s as one would expect.
You can expect that list_c to contain integral_c<int,16> and integral_c<int,8>, neither of which is the same type as int_<16>. I suggest you try a predicate like mpl::equal_to<_,_> with find_if: typedef not_< is_same< find_if<s,mpl::int_<16>, mpl::equal_to<_,_> >::type , end<s>::type > >::type r; HTH, -- Dave Abrahams Boost Consulting www.boost-consulting.com