Joel, On Tue, Feb 10, 2009 at 8:10 PM, Joel de Guzman <joel@boost-consulting.com> wrote:
Stjepan Rajko wrote:
Hi,
I tried to make boost::array a conforming MPL sequence by including:
#include <boost/fusion/adapted/array.hpp> // makes array a conforming fusion sequence #include <boost/fusion/mpl.hpp> // makes fusion sequences conforming MPL sequences
but,
typedef boost::array<int, 1> array; assert(boost::mpl::is_sequence<array>::type::value); // fails
Am I misinterpreting the fusion documentation in expecting that this should work? Is there another way of making boost::array an mpl sequence?
I think the basic problem is that is_sequence is not really part of the requirements for an MPL sequence. You don't have to be a conforming MPL sequences. I am not sure how to best approach this. Perhaps the MPL authors have a better idea?
I was able to get the fusion-adapted boost::array to be a conforming mpl sequence by adding: namespace boost { namespace mpl { template<typename T, std::size_t N> struct tag<boost::array<T,N> > { typedef boost::fusion::fusion_sequence_tag type; }; template<typename T, std::size_t N> struct sequence_tag<boost::array<T,N> > { typedef boost::fusion::fusion_sequence_tag type; }; }} Best, Stjepan