Re: [Boost-bugs] [Boost C++ Libraries] #5414: Errors compiling a piece of fusion with phoenix. Pheonix bug?

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #5414: Errors compiling a piece of fusion with phoenix. Pheonix bug?
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-04-05 10:07:03

#5414: Errors compiling a piece of fusion with phoenix. Pheonix bug?
--------------------------------------+-------------------------------------
  Reporter:  joe@…                    |       Owner:  djowel 
      Type:  Bugs                     |      Status:  closed 
 Milestone:  To Be Determined         |   Component:  phoenix
   Version:  Boost Development Trunk  |    Severity:  Problem
Resolution:  fixed                    |    Keywords:         
--------------------------------------+-------------------------------------

Comment (by joe@…):

 Still trying to get this result struct working. What's wrong with this
 then?

 {{{

 struct vector_dot_product_impl {
         template<typename V1, typename V2>
         struct result;

         template <typename This, typename V1, typename V2>
         struct result<This(V1, V2)>
         {
                 // Presume that the return type is the type of the first
 element
                 // of the first sequence argument.
                 typedef typename boost::fusion::result_of::value_at<V1,
 boost::mpl::int_<0> >::type type;
         };

         template <typename V1, typename V2>
         typename result<V1, V2>::type operator()(V1 v1, V2 v2) const
         {
                 using boost::phoenix::arg_names::_1;
                 using boost::phoenix::arg_names::_2;
                 using boost::fusion::fold;
                 using boost::fusion::transform;
                 return fold(transform(v1, v2, _1 * _2), 0.0, _1 + _2);
         }
 };
 }}}

 Thanks!

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/5414#comment:6>
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