[Boost-users] MPL Issue in apply.hpp in CVS

From: Martin Ecker (martin.ecker_at_[hidden])
Date: 2004-01-25 05:58:47

Hello,

I wanted to use boost::variant, so I got the Boost libraries
from CVS. While developing a small test program I discovered
an issue in the MPL header file apply.hpp that prevented
successful compilation on MSVC 7.1. In particular, starting
on line 245 in boost/mpl/apply.hpp it says

// ISO98 C++, with minor concession to vc7

template<
      typename F, AUX_APPLY_N_PARAMS(i, typename T)
    >
struct BOOST_PP_CAT(apply,i)
{
    // Metafunction forwarding confuses vc7
    typedef typename F::template apply<
       AUX_APPLY_N_PARAMS(i, T)
    >::type
        
    BOOST_MPL_AUX_LAMBDA_SUPPORT(
          BOOST_PP_INC(i)
        , BOOST_PP_CAT(apply,i)
        , (F, AUX_APPLY_N_PARAMS(i,T))
        )
};

The first typedef in that struct should be

    // Metafunction forwarding confuses vc7
    typedef typename F::template apply<
       AUX_APPLY_N_PARAMS(i, T)
    >::type type;

Regards,
Martin

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