diff --git a/include/boost/range/adaptor/indexed.hpp b/include/boost/range/adaptor/indexed.hpp
old mode 100755
new mode 100644
index 5a523ce..cb2c127
--- a/include/boost/range/adaptor/indexed.hpp
+++ b/include/boost/range/adaptor/indexed.hpp
@@ -55,6 +55,9 @@ namespace boost
             index_type m_index;
 
         public:
+            indexed_iterator()
+            : m_index(index_type()) {}
+            
             explicit indexed_iterator( Iter i, index_type index )
             : base(i), m_index(index)
             {
diff --git a/include/boost/range/concepts.hpp b/include/boost/range/concepts.hpp
index 5965293..5a02a21 100644
--- a/include/boost/range/concepts.hpp
+++ b/include/boost/range/concepts.hpp
@@ -330,8 +330,8 @@ namespace boost {
     struct BidirectionalRangeConcept : ForwardRangeConcept<T>
     {
 #if BOOST_RANGE_ENABLE_CONCEPT_ASSERT
-        BOOST_RANGE_CONCEPT_ASSERT((BidirectionalIteratorConcept<BOOST_DEDUCED_TYPENAME BidirectionalRangeConcept::iterator>));
-        BOOST_RANGE_CONCEPT_ASSERT((BidirectionalIteratorConcept<BOOST_DEDUCED_TYPENAME BidirectionalRangeConcept::const_iterator>));
+        BOOST_RANGE_CONCEPT_ASSERT((range_detail::BidirectionalIteratorConcept<BOOST_DEDUCED_TYPENAME BidirectionalRangeConcept::iterator>));
+        BOOST_RANGE_CONCEPT_ASSERT((range_detail::BidirectionalIteratorConcept<BOOST_DEDUCED_TYPENAME BidirectionalRangeConcept::const_iterator>));
 #endif
     };
 
@@ -348,8 +348,8 @@ namespace boost {
     struct RandomAccessRangeConcept : BidirectionalRangeConcept<T>
     {
 #if BOOST_RANGE_ENABLE_CONCEPT_ASSERT
-        BOOST_RANGE_CONCEPT_ASSERT((RandomAccessIteratorConcept<BOOST_DEDUCED_TYPENAME RandomAccessRangeConcept::iterator>));
-        BOOST_RANGE_CONCEPT_ASSERT((RandomAccessIteratorConcept<BOOST_DEDUCED_TYPENAME RandomAccessRangeConcept::const_iterator>));
+        BOOST_RANGE_CONCEPT_ASSERT((range_detail::RandomAccessIteratorConcept<BOOST_DEDUCED_TYPENAME RandomAccessRangeConcept::iterator>));
+        BOOST_RANGE_CONCEPT_ASSERT((range_detail::RandomAccessIteratorConcept<BOOST_DEDUCED_TYPENAME RandomAccessRangeConcept::const_iterator>));
 #endif
     };
 
diff --git a/include/boost/range/detail/extract_optional_type.hpp b/include/boost/range/detail/extract_optional_type.hpp
old mode 100755
new mode 100644
index 8292e34..4a7f71a
--- a/include/boost/range/detail/extract_optional_type.hpp
+++ b/include/boost/range/detail/extract_optional_type.hpp
@@ -16,7 +16,7 @@
 
 #include <boost/config.hpp>
 
-#ifdef BOOST_NO_PARTIAL_TEMPLATE_SPECIALIZATION
+#ifdef BOOST_NO_PARTIAL_SPECIALIZATION_IMPLICIT_DEFAULT_ARGS
 
 #define BOOST_RANGE_EXTRACT_OPTIONAL_TYPE( a_typedef )                         \
     template< typename C >                                                     \
diff --git a/include/boost/range/irange.hpp b/include/boost/range/irange.hpp
index 248124f..f35df47 100644
--- a/include/boost/range/irange.hpp
+++ b/include/boost/range/irange.hpp
@@ -217,7 +217,7 @@ namespace boost
         const std::ptrdiff_t sz = static_cast<std::ptrdiff_t>(step_size >= 0 ? step_size : -step_size);
         const Integer l = step_size >= 0 ? last : first;
         const Integer f = step_size >= 0 ? first : last;
-        const std::ptrdiff_t num_steps = (l + ((l-f) % sz) - f) / sz;
+        const std::ptrdiff_t num_steps = (l - f) / sz + ((l - f) % sz ? 1 : 0);
         BOOST_ASSERT(num_steps >= 0);
        
         return strided_integer_range<Integer>(
diff --git a/include/boost/range/istream_range.hpp b/include/boost/range/istream_range.hpp
old mode 100755
new mode 100644
index c3f2248..a486317
--- a/include/boost/range/istream_range.hpp
+++ b/include/boost/range/istream_range.hpp
@@ -14,7 +14,7 @@
  */
 
 #include <iterator>
-#include <istream>
+#include <iosfwd>
 #include <boost/config.hpp>
 #include <boost/range/iterator_range.hpp>
 
@@ -27,8 +27,8 @@ namespace boost
         istream_range(std::basic_istream<Elem, Traits>& in)
         {
             return iterator_range<std::istream_iterator<Type, Elem, Traits> >(
-                std::istream_iterator<Type>(in),
-                std::istream_iterator<Type>());
+                std::istream_iterator<Type, Elem, Traits>(in),
+                std::istream_iterator<Type, Elem, Traits>());
         }
     } // namespace range
     using range::istream_range;
diff --git a/include/boost/range/iterator_range_core.hpp b/include/boost/range/iterator_range_core.hpp
index 60c7670..6e68992 100644
--- a/include/boost/range/iterator_range_core.hpp
+++ b/include/boost/range/iterator_range_core.hpp
@@ -21,7 +21,9 @@
 #include <boost/assert.hpp>
 #include <boost/iterator/iterator_traits.hpp>
 #include <boost/iterator/iterator_facade.hpp>
+#include <boost/mpl/or.hpp>
 #include <boost/type_traits/is_abstract.hpp>
+#include <boost/type_traits/is_array.hpp>
 #include <boost/type_traits/is_pointer.hpp>
 #include <boost/range/functions.hpp>
 #include <boost/range/iterator.hpp>
@@ -167,7 +169,8 @@ namespace boost
 
         private: // for return value of operator()()
             typedef BOOST_DEDUCED_TYPENAME
-                boost::mpl::if_< boost::is_abstract<value_type>,
+                boost::mpl::if_< boost::mpl::or_< boost::is_abstract< value_type >, 
+                                                  boost::is_array< value_type > >,
                                  reference, value_type >::type abstract_value_type;
 
         public:
diff --git a/test/Jamfile.v2 b/test/Jamfile.v2
index d76c141..bcaa772 100644
--- a/test/Jamfile.v2
+++ b/test/Jamfile.v2
@@ -161,5 +161,6 @@ test-suite range :
 	[ range-test ticket_5544_terminate_irange ]
 	[ range-test ticket_5547 ]
 	[ range-test ticket_5556_is_sorted_namespace ]
+	[ range-test ticket_6944 ]
     ;
 
diff --git a/test/adaptor_test/indexed.cpp b/test/adaptor_test/indexed.cpp
index 2a9c45d..a5bef4d 100644
--- a/test/adaptor_test/indexed.cpp
+++ b/test/adaptor_test/indexed.cpp
@@ -15,11 +15,14 @@
 
 #include <boost/assign.hpp>
 #include <boost/range/algorithm_ext.hpp>
+#include <boost/range/concepts.hpp>
 
 #include <algorithm>
 #include <list>
 #include <vector>
 
+#include "../test_utils.hpp"
+
 namespace boost
 {
     namespace
@@ -83,6 +86,9 @@ namespace boost
         {
             indexed_test_impl< std::vector< int > >();
             indexed_test_impl< std::list< int > >();
+            
+            check_random_access_range_concept(std::vector<int>() | boost::adaptors::indexed(0));
+            check_bidirectional_range_concept(std::list<int>() | boost::adaptors::indexed(0));
         }
     }
 }
diff --git a/test/irange.cpp b/test/irange.cpp
index 358a2b1..659401b 100644
--- a/test/irange.cpp
+++ b/test/irange.cpp
@@ -35,15 +35,6 @@ namespace boost
                                        reference.begin(), reference.end() );
     }
     
-    template<typename Integer>
-    std::ptrdiff_t test_irange_calculate_num_steps(Integer first, Integer last, int step)
-    {
-        const std::ptrdiff_t sz = static_cast<std::ptrdiff_t>(step >= 0 ? step : -step);
-        const std::ptrdiff_t l = static_cast<std::ptrdiff_t>(step >= 0 ? last : first);
-        const std::ptrdiff_t f = static_cast<std::ptrdiff_t>(step >= 0 ? first : last);
-        return (l + ((l-f) % sz) - f) / sz;
-    }
-
     // Test an integer range with a runtime specified step size.
     template<typename Integer, typename IntegerInput>
     void test_irange_impl(IntegerInput first, IntegerInput last, int step)
@@ -58,9 +49,12 @@ namespace boost
         
         std::vector<Integer> reference;
 
-        const std::ptrdiff_t num_steps = test_irange_calculate_num_steps(first, last, step);        
-        Integer current_value = first;
-        for (std::ptrdiff_t i = 0; i < num_steps; ++i, current_value += step)
+        const std::ptrdiff_t first_p = static_cast<std::ptrdiff_t>(first);
+        const std::ptrdiff_t last_p = static_cast<std::ptrdiff_t>(last);
+        const std::ptrdiff_t step_p = static_cast<std::ptrdiff_t>(step);
+        for (std::ptrdiff_t current_value = first_p; 
+             step_p >= 0 ? current_value < last_p : current_value > last_p;
+             current_value += step_p)
             reference.push_back(current_value);
 
         std::vector<Integer> test;
diff --git a/test/istream_range.cpp b/test/istream_range.cpp
index b3e16db..7d10313 100644
--- a/test/istream_range.cpp
+++ b/test/istream_range.cpp
@@ -19,15 +19,15 @@
 
 namespace
 {
-    // Test an integer range with a step size of 1.
-    void test_istream_range()
+    template <typename CharT>
+    void test_istream_range_impl()
     {
-        std::stringstream s;
+        std::basic_stringstream<CharT> s;
         std::vector<int> reference;
         for (int i = 0; i < 10; ++i)
         {
             reference.push_back(i);
-            s << i << " ";
+            s << i << CharT(' ');
         }
 
         std::vector<int> target;
@@ -36,6 +36,13 @@ namespace
         BOOST_CHECK_EQUAL_COLLECTIONS( reference.begin(), reference.end(),
             target.begin(), target.end() );
     }
+    
+    // Test an istream range.
+    void test_istream_range()
+    {
+        test_istream_range_impl<char>();
+        test_istream_range_impl<wchar_t>();
+    }
 
 } // namespace anonymous namespace
 
diff --git a/test/iterator_range.cpp b/test/iterator_range.cpp
index a53ef16..c914f43 100644
--- a/test/iterator_range.cpp
+++ b/test/iterator_range.cpp
@@ -101,6 +101,11 @@ void check_iterator_range()
     BOOST_CHECK( rrr == str );
 
     check_reference_type();
+    
+    // Check that an iterator range can be instantiated with
+    // a pointer to an array as an iterator.
+    int arr[2][2];
+    boost::make_iterator_range(arr, arr + 2);
 }
 
 namespace iterator_range_test_detail
diff --git a/test/test_utils.hpp b/test/test_utils.hpp
new file mode 100644
index 0000000..7af920a
--- /dev/null
+++ b/test/test_utils.hpp
@@ -0,0 +1,24 @@
+// Boost.Range library
+//
+//  Copyright Akira Takahashi 2013. Use, modification and
+//  distribution is subject to 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)
+//
+//
+// For more information, see http://www.boost.org/libs/range/
+//
+
+#include <boost/range/concepts.hpp>
+
+template <class RandomAccessRng>
+void check_random_access_range_concept(const RandomAccessRng& rng)
+{
+    BOOST_RANGE_CONCEPT_ASSERT(( boost::RandomAccessRangeConcept<RandomAccessRng> ));
+}
+
+template <class BidirectionalRng>
+void check_bidirectional_range_concept(const BidirectionalRng& rng)
+{
+    BOOST_RANGE_CONCEPT_ASSERT(( boost::BidirectionalRangeConcept<BidirectionalRng> ));
+}
diff --git a/test/ticket_6944.cpp b/test/ticket_6944.cpp
new file mode 100644
index 0000000..43796a8
--- /dev/null
+++ b/test/ticket_6944.cpp
@@ -0,0 +1,46 @@
+// Boost.Range library
+//
+//  Copyright Neil Groves 2011. Use, modification and
+//  distribution is subject to 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)
+//
+//
+// For more information, see http://www.boost.org/libs/range/
+//
+#include <boost/concept_check.hpp>
+#include <boost/iterator/iterator_adaptor.hpp>
+#include <boost/range/concepts.hpp>
+#include <boost/range/iterator_range.hpp>
+
+#include <boost/test/test_tools.hpp>
+#include <boost/test/unit_test.hpp>
+
+#include <vector>
+
+namespace boost
+{
+    typedef std::vector<int>::iterator iter_base;
+    struct iter : boost::iterator_adaptor<iter, iter_base, int, boost::use_default, int> {}; // will be deduced as random-access traversal but input category
+    typedef boost::iterator_range<iter> iter_range;
+    
+    namespace
+    {
+        // Ticket 6944 - Some Range concepts use the incorrect Iterator concept
+        void test_ticket_6944()
+        {
+            BOOST_CONCEPT_ASSERT(( boost::RandomAccessRangeConcept<iter_range> ));
+        }
+    }
+}
+
+boost::unit_test::test_suite*
+init_unit_test_suite(int argc, char* argv[])
+{
+    boost::unit_test::test_suite* test
+        = BOOST_TEST_SUITE( "RangeTestSuite.ticket_6944" );
+
+    test->add( BOOST_TEST_CASE( &boost::test_ticket_6944 ) );
+
+    return test;
+}