Re: [Boost-users] large variant performance compared (50 elements)

18 Jan 2011

      On 01/17/11 18:35, Larry Evans wrote:
[snip]
...
However, I'm still getting a compile error with gcc4.5.1.  A partial
list of the compilation output is also attached.
Any ideas what's going wrong?
[snip]
Apparently gcc4.5.1 is more stringent about converting value types to
reference types.

Changing:

       template
       < typename VisitorType
       , typename IndexType
       >
       inline typename VisitorType::result_type
     apply_visitor_impl
       ( VisitorType& rVisitor
       , boost::mpl::true_ /*is_unrolled_t*/
       ) const
     {
           typedef typename
         boost::mpl::at::type
       type_t;
       return
         rVisitor
           ( boost::static_pointer_cast<typename type_t::value_type>
             ( m_spSelect
             )
           );
     }

to:

       template
       < typename VisitorType
       , typename IndexType
       >
       inline typename VisitorType::result_type
     apply_visitor_impl
       ( VisitorType& rVisitor
       , boost::mpl::true_ /*is_unrolled_t*/
       ) const
     {
           typedef typename
         boost::mpl::at::type::value_type
       value_t;
         boost::shared_ptr
       spc(boost::static_pointer_cast(m_spSelect));
       return rVisitor(spc);
     }

at around line 163 of CLoPtrVariant.hpp solved problem.