fusion\support\tag_of.hpp, boost::fusion::traits

[Mikhail Strelnikov <strelnikov@…>]

Here is the code I tried to compile with VC++2008:

typedef boost::fusion::traits::deduce_sequence <

boost::mpl::vector<int, char>

::type seq_t;

error C2039: 'is_mpl_sequence' : is not a member of 'boost::fusion::traits::detail'

I think it because 'fusion\support\deduce_sequence.hpp' introduces 'detail' namespace into boost::fusion::traits (instead of boost::fusion).

[Mikhail Strelnikov <strelnikov@…>]

This file could be used to check that deduce_sequence compiles with boost::mpl::vector as parameter

[Mikhail Strelnikov <strelnikov@…>]

There is what I propose to change in 'boost/fusion/support/tag_of.hpp' (I'm not sure if these changes are ideologically correct but all the Boost::Fusion tests are passed with them):

Comparing files tag_of.hpp and TAG_OF.HPP_OLD
***** tag_of.hpp
        struct tag_of
          : mpl::if_< fusion::detail::is_mpl_sequence<Sequence>,
              mpl::identity<mpl_sequence_tag>,
***** TAG_OF.HPP_OLD
        struct tag_of
          : mpl::if_< detail::is_mpl_sequence<Sequence>,
              mpl::identity<mpl_sequence_tag>,
*****

***** tag_of.hpp
        {
            BOOST_MPL_ASSERT_NOT((fusion::detail::is_specialized<Sequence>));
        };
***** TAG_OF.HPP_OLD
        {
            BOOST_MPL_ASSERT_NOT((detail::is_specialized<Sequence>));
        };
*****

Thanks.

[Mikhail Strelnikov <strelnikov@…>]

patch for the 'boost/fusion/support/tag_of.hpp' in the unified diff format