----Original Message---- From: Manfred Doudar [mailto:manfred.doudar@metoceanengineers.com] Sent: 16 November 2005 11:35 To: boost@lists.boost.org Subject: Re: [boost] mpl help needed - doing the impossible?
Manfred Doudar wrote:
/* Now, how do I get T out when Rank == 1, ... compiler complains about seeing a MyArray/blitz::Array of <T, Rank = 0> (, which is not defined for blitz Arrays) */ template <typename T, int Rank> typename boost::mpl::if_ < typename boost::mpl::equal_to < boost::mpl::int_<Rank> , boost::mpl::int_<1> >::type , T , blitz::Array<T,
boost::mpl::int_<Rank>::prior::value>
^ Oops typo, should be: MyArray<T,
boost::mpl::int_<Rank>::prior::value>
... but nonetheless, the problem remains ...
>::type MyArray<T, Rank> :: operator[] (const int& index) throw(); { // Slicing
How about a helper traits class? template <typename T, int Rank> struct SliceType { typedef typename MyArray<T, Rank-1> type; }; template <typename T> struct SliceType<T,1> { typedef T type; }; template <typename T, int Rank> typename SliceType<T,Rank>::type MyArray<T,Rank> :: operator[] (const int& index) throw(); -- Martin Bonner Martin.Bonner@Pitechnology.com Pi Technology, Milton Hall, Ely Road, Milton, Cambridge, CB4 6WZ, ENGLAND Tel: +44 (0)1223 441434