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Fix for ticket #6000

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[SVN r74873]
This commit is contained in:
Joel de Guzman
2011-10-10 02:33:13 +00:00
parent 295bacb652
commit 01156b172a
2 changed files with 56 additions and 3 deletions
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45
include/boost/fusion/algorithm/transformation/pop_back.hpp
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@ -78,6 +78,51 @@ namespace boost { namespace fusion
, mpl::int_<(Last::is_last?1:0)>
>::type
{};
template <typename Iterator, bool IsLast_>
struct prior_impl
{
typedef typename Iterator::iterator_base_type base_type;
typedef typename
result_of::prior<base_type>::type
base_prior;
typedef pop_back_iterator<base_prior, false> type;
static type
call(Iterator const& i)
{
return type(fusion::prior(i.iterator_base));
}
};
template <typename Iterator>
struct prior_impl<Iterator, true>
{
// If this is the last iterator, we'll have to double back
typedef typename Iterator::iterator_base_type base_type;
typedef typename
result_of::prior<
typename result_of::prior<base_type>::type
>::type
base_prior;
typedef pop_back_iterator<base_prior, false> type;
static type
call(Iterator const& i)
{
return type(fusion::prior(
fusion::prior(i.iterator_base)));
}
};
template <typename Iterator>
struct prior : prior_impl<Iterator, Iterator::is_last>
{};
};
namespace result_of