From: Yuval Ronen (ronen_yuval_at_[hidden])
Date: 2007-05-31 17:31:52
I have the following code:
#include <utility>
#include <boost/mpl/map.hpp>
#include <boost/mpl/transform.hpp>
template <typename MplPair>
struct make_ptr_pair1
{
typedef std::pair<typename MplPair::first *, typename
MplPair::second *> type;
};
template <typename First, typename Second>
struct make_ptr_pair2
{
typedef std::pair<First *, Second *> type;
};
int main(int argc, char *argv[])
{
namespace mpl = boost::mpl;
typedef mpl::map< mpl::pair<int, double> > my_map;
//typedef mpl::transform< my_map, make_ptr_pair1<mpl::_1> >::type
ptr_pair_seq1;
//typedef mpl::transform< my_map, make_ptr_pair2<mpl::_1, mpl::_2>
>::type ptr_pair_seq2;
return 0;
}
If I uncomment any of the two mpl::transform lines in main(), the code
doesn't compile (VC8). The point is to get a sequence of std::pairs out
of the content of the mpl::map. Is there anything I'm doing wrong? Can
mpl::transform be used for mpl::map? Maybe I can do it with fusion, but
the above code seems to be something that's supposed to be working,
isn't it?
Yuval