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Diffstat (limited to 'boost/fusion/adapted/boost_tuple/boost_tuple_iterator.hpp')
-rw-r--r--boost/fusion/adapted/boost_tuple/boost_tuple_iterator.hpp29
1 files changed, 26 insertions, 3 deletions
diff --git a/boost/fusion/adapted/boost_tuple/boost_tuple_iterator.hpp b/boost/fusion/adapted/boost_tuple/boost_tuple_iterator.hpp
index 416880b4e9..850eef5fa7 100644
--- a/boost/fusion/adapted/boost_tuple/boost_tuple_iterator.hpp
+++ b/boost/fusion/adapted/boost_tuple/boost_tuple_iterator.hpp
@@ -42,12 +42,18 @@ namespace boost { namespace fusion
struct boost_tuple_is_empty<tuples::tuple<> const> : mpl::true_ {};
}
+ template <typename Cons>
+ struct boost_tuple_iterator_identity;
+
template <typename Cons = tuples::null_type>
struct boost_tuple_iterator
: iterator_facade<boost_tuple_iterator<Cons>, forward_traversal_tag>
{
typedef Cons cons_type;
+ typedef boost_tuple_iterator_identity<
+ typename add_const<Cons>::type> identity;
+
BOOST_FUSION_GPU_ENABLED
explicit boost_tuple_iterator(Cons& in_cons)
: cons(in_cons) {}
@@ -98,7 +104,7 @@ namespace boost { namespace fusion
return type(iter.cons.get_tail());
}
};
-
+
template <typename I1, typename I2>
struct distance;
@@ -115,7 +121,7 @@ namespace boost { namespace fusion
>::type
>::type type;
};
-
+
template <typename I1, typename I2>
struct distance
{
@@ -124,7 +130,7 @@ namespace boost { namespace fusion
mpl::int_<0>,
lazy_next_distance<I1, I2>
>::type type;
-
+
BOOST_FUSION_GPU_ENABLED
static type
call(I1 const&, I2 const&)
@@ -133,6 +139,11 @@ namespace boost { namespace fusion
}
};
+ template <typename I1, typename I2>
+ struct equal_to
+ : is_same<typename I1::identity, typename I2::identity>
+ {};
+
private:
// silence MSVC warning C4512: assignment operator could not be generated
boost_tuple_iterator& operator= (boost_tuple_iterator const&);
@@ -144,6 +155,9 @@ namespace boost { namespace fusion
{
typedef Null cons_type;
+ typedef boost_tuple_iterator_identity<
+ typename add_const<Null>::type> identity;
+
template <typename I1, typename I2>
struct equal_to
: mpl::or_<
@@ -193,6 +207,15 @@ namespace boost { namespace fusion
};
}}
+#ifdef BOOST_FUSION_WORKAROUND_FOR_LWG_2408
+namespace std
+{
+ template <typename Cons>
+ struct iterator_traits< ::boost::fusion::boost_tuple_iterator<Cons> >
+ { };
+}
+#endif
+
#endif