Merge branch 'develop'

# Conflicts:
#	include/boost/iterator/reverse_iterator.hpp

include/boost/iterator/advance.hpp

@@ -0,0 +1,84 @@
+// Copyright (C) 2017 Michel Morin.
+//
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_ITERATOR_ADVANCE_HPP
+#define BOOST_ITERATOR_ADVANCE_HPP
+
+#include <boost/config.hpp>
+#include <boost/iterator/iterator_categories.hpp>
+
+namespace boost {
+namespace iterators {
+
+    namespace detail {
+        template <typename InputIterator, typename Distance>
+        inline BOOST_CXX14_CONSTEXPR void
+        advance_impl(
+            InputIterator& it
+          , Distance n
+          , incrementable_traversal_tag
+        )
+        {
+            while (n > 0) {
+                ++it;
+                --n;
+            }
+        }
+
+        template <typename BidirectionalIterator, typename Distance>
+        inline BOOST_CXX14_CONSTEXPR void
+        advance_impl(
+            BidirectionalIterator& it
+          , Distance n
+          , bidirectional_traversal_tag
+        )
+        {
+            if (n >= 0) {
+                while (n > 0) {
+                    ++it;
+                    --n;
+                }
+            }
+            else {
+                while (n < 0) {
+                    --it;
+                    ++n;
+                }
+            }
+        }
+
+        template <typename RandomAccessIterator, typename Distance>
+        inline BOOST_CXX14_CONSTEXPR void
+        advance_impl(
+            RandomAccessIterator& it
+          , Distance n
+          , random_access_traversal_tag
+        )
+        {
+            it += n;
+        }
+    }
+
+    namespace advance_adl_barrier {
+        template <typename InputIterator, typename Distance>
+        inline BOOST_CXX14_CONSTEXPR void
+        advance(InputIterator& it, Distance n)
+        {
+            detail::advance_impl(
+                it, n, typename iterator_traversal<InputIterator>::type()
+            );
+        }
+    }
+
+    using namespace advance_adl_barrier;
+
+} // namespace iterators
+
+using iterators::advance;
+
+} // namespace boost
+
+#endif

include/boost/iterator/distance.hpp

@@ -0,0 +1,65 @@
+// Copyright (C) 2017 Michel Morin.
+//
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_ITERATOR_DISTANCE_HPP
+#define BOOST_ITERATOR_DISTANCE_HPP
+
+#include <boost/config.hpp>
+#include <boost/iterator/iterator_categories.hpp>
+#include <boost/iterator/iterator_traits.hpp>
+
+namespace boost {
+namespace iterators {
+
+    namespace detail {
+        template <typename SinglePassIterator>
+        inline BOOST_CXX14_CONSTEXPR typename iterator_difference<SinglePassIterator>::type
+        distance_impl(
+            SinglePassIterator first
+          , SinglePassIterator last
+          , single_pass_traversal_tag
+        )
+        {
+            typename iterator_difference<SinglePassIterator>::type n = 0;
+            while (first != last) {
+                ++first;
+                ++n;
+            }
+            return n;
+        }
+
+        template <typename RandomAccessIterator>
+        inline BOOST_CXX14_CONSTEXPR typename iterator_difference<RandomAccessIterator>::type
+        distance_impl(
+            RandomAccessIterator first
+          , RandomAccessIterator last
+          , random_access_traversal_tag
+        )
+        {
+            return last - first;
+        }
+    }
+
+    namespace distance_adl_barrier {
+        template <typename SinglePassIterator>
+        inline BOOST_CXX14_CONSTEXPR typename iterator_difference<SinglePassIterator>::type
+        distance(SinglePassIterator first, SinglePassIterator last)
+        {
+            return detail::distance_impl(
+                first, last, typename iterator_traversal<SinglePassIterator>::type()
+            );
+        }
+    }
+
+    using namespace distance_adl_barrier;
+
+} // namespace iterators
+
+using iterators::distance;
+
+} // namespace boost
+
+#endif

include/boost/iterator/reverse_iterator.hpp

@@ -7,7 +7,6 @@
 #ifndef BOOST_REVERSE_ITERATOR_23022003THW_HPP
 #define BOOST_REVERSE_ITERATOR_23022003THW_HPP
 
-#include <boost/next_prior.hpp>
 #include <boost/iterator.hpp>
 #include <boost/iterator/iterator_adaptor.hpp>
 
@@ -40,14 +39,19 @@ namespace iterators {
       {}
 
    private:
-      typename super_t::reference dereference() const { return *boost::prior(this->base()); }
+      typename super_t::reference dereference() const
+      {
+          Iterator it = this->base_reference();
+          --it;
+          return *it;
+      }
 
       void increment() { --this->base_reference(); }
       void decrement() { ++this->base_reference(); }
 
       void advance(typename super_t::difference_type n)
       {
-          this->base_reference() += -n;
+          this->base_reference() -= n;
       }
 
       template <class OtherIterator>