[Boost-users] [mpl] Using at_c within find_if

From: Christian Henning (chhenning_at_[hidden])
Date: 2007-03-26 16:18:26

Hi there, I'm trying to find a solution for looking for type vector
containing a specific type. On another thread I was suggested to use
at_c within the find_if algorithm. Unfortunately the code doesn't
compile.

#include "boost/mpl/vector.hpp"
#include <boost/mpl/find_if.hpp>
#include <boost/mpl/at.hpp>

using namespace std;
using namespace boost;

typedef mpl::vector<char, char> vec_1;
typedef mpl::vector<char, int> vec_2;

typedef mpl::vector<vec_1, vec_2> mat;

typedef mpl::find_if<mat, is_same<mpl::at_c<mpl::_1,1>, int> >::type iter;

int _tmain(int argc, _TCHAR* argv[])
{
   BOOST_STATIC_ASSERT(( is_same< mpl::deref<iter>::type, vec_2 >::value ));

   return 0;
}

Might this be a bug in the MPL lib?

Thanks for any help,
Christian