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find_if: Improved tag usage

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The traversal tag is a bit complex than before.
This commit is contained in:
Kohei Takahashi
2018-07-07 07:18:56 +09:00
parent 9036c72a61
commit 47ff2e6cb5
1 changed files with 8 additions and 17 deletions
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25
include/boost/fusion/algorithm/query/detail/find_if.hpp
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@ -22,10 +22,9 @@
#include <boost/fusion/sequence/intrinsic/begin.hpp> #include <boost/fusion/sequence/intrinsic/begin.hpp>
#include <boost/fusion/sequence/intrinsic/end.hpp> #include <boost/fusion/sequence/intrinsic/end.hpp>
#include <boost/fusion/support/category_of.hpp> #include <boost/fusion/support/category_of.hpp>
#include <boost/core/enable_if.hpp>
namespace boost { namespace fusion { namespace boost { namespace fusion { namespace detail
struct random_access_traversal_tag;
namespace detail
{ {
template <typename Iterator, typename Pred> template <typename Iterator, typename Pred>
struct apply_filter struct apply_filter
@ -179,7 +178,7 @@ namespace detail
First First
, Last , Last
, Pred , Pred
, is_base_of<random_access_traversal_tag, typename traits::category_of<First>::type>::value , traits::is_random_access<First>::value
>::type >::type
type; type;
@ -208,31 +207,23 @@ namespace detail
return recursive_call(iter, found()); return recursive_call(iter, found());
} }
template <typename Iterator, typename Tag> template <typename Iterator>
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
static type static typename boost::disable_if<traits::is_random_access<Iterator>, type>::type
choose_call(Iterator const& iter, Tag) iter_call(Iterator const& iter)
{ {
return recursive_call(iter); return recursive_call(iter);
} }
template <typename Iterator> template <typename Iterator>
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
static type static typename boost::enable_if<traits::is_random_access<Iterator>, type>::type
choose_call(Iterator const& iter, random_access_traversal_tag) iter_call(Iterator const& iter)
{ {
typedef typename result_of::distance<Iterator, type>::type N; typedef typename result_of::distance<Iterator, type>::type N;
return fusion::advance<N>(iter); return fusion::advance<N>(iter);
} }
template <typename Iterator>
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
static type
iter_call(Iterator const& iter)
{
return choose_call(iter, typename traits::category_of<Iterator>::type());
}
template <typename Sequence> template <typename Sequence>
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
static type static type