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Translate fusion iterator categories to MPL iteraotr categories for fusion_iterator. Fixes #3204.

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[SVN r62889]
This commit is contained in:
Steven Watanabe
2010-06-13 01:22:41 +00:00
parent c9a5364472
commit 9b7b9db979
1 changed files with 23 additions and 1 deletions
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24
include/boost/fusion/iterator/mpl/fusion_iterator.hpp
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@ -16,6 +16,27 @@
#include <boost/mpl/next_prior.hpp> #include <boost/mpl/next_prior.hpp>
#include <boost/mpl/advance_fwd.hpp> #include <boost/mpl/advance_fwd.hpp>
#include <boost/mpl/distance_fwd.hpp> #include <boost/mpl/distance_fwd.hpp>
#include <boost/mpl/iterator_tags.hpp>
#include <boost/mpl/eval_if.hpp>
#include <boost/type_traits/is_base_of.hpp>
namespace boost { namespace fusion { namespace detail
{
template<class Category>
struct to_mpl_category {
typedef typename mpl::eval_if<
is_base_of<random_access_traversal_tag, Category>,
mpl::random_access_iterator_tag,
mpl::eval_if<
is_base_of<bidirectional_traversal_tag, Category>,
mpl::bidirectional_iterator_tag,
mpl::forward_iterator_tag
>
>::type type;
};
}}}
namespace boost { namespace mpl namespace boost { namespace mpl
{ {
@ -23,7 +44,8 @@ namespace boost { namespace mpl
struct fusion_iterator struct fusion_iterator
{ {
typedef typename fusion::result_of::value_of<Iterator>::type type; typedef typename fusion::result_of::value_of<Iterator>::type type;
typedef typename fusion::traits::category_of<Iterator>::type category; typedef typename fusion::traits::category_of<Iterator>::type fusion_category;
typedef typename fusion::detail::to_mpl_category<fusion_category>::type category;
typedef Iterator iterator; typedef Iterator iterator;
}; };