diff --git a/ndnboost/detail/iterator.hpp b/ndnboost/detail/iterator.hpp
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+// (C) Copyright David Abrahams 2002.
+// 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)
+
+// Boost versions of
+//
+//    std::iterator_traits<>::iterator_category
+//    std::iterator_traits<>::difference_type
+//    std::distance()
+//
+// ...for all compilers and iterators
+//
+// Additionally, if X is a pointer
+//    std::iterator_traits<X>::pointer
+
+// Otherwise, if partial specialization is supported or X is not a pointer
+//    std::iterator_traits<X>::value_type
+//    std::iterator_traits<X>::pointer
+//    std::iterator_traits<X>::reference
+//
+// See http://www.boost.org for most recent version including documentation.
+
+// Revision History
+// 04 Mar 2001 - More attempted fixes for Intel C++ (David Abrahams)
+// 03 Mar 2001 - Put all implementation into namespace
+//               ndnboost::detail::iterator_traits_. Some progress made on fixes
+//               for Intel compiler. (David Abrahams)
+// 02 Mar 2001 - Changed BOOST_MSVC to BOOST_MSVC_STD_ITERATOR in a few
+//               places. (Jeremy Siek)
+// 19 Feb 2001 - Improved workarounds for stock MSVC6; use yes_type and
+//               no_type from type_traits.hpp; stopped trying to remove_cv
+//               before detecting is_pointer, in honor of the new type_traits
+//               semantics. (David Abrahams)
+// 13 Feb 2001 - Make it work with nearly all standard-conforming iterators
+//               under raw VC6. The one category remaining which will fail is
+//               that of iterators derived from std::iterator but not
+//               ndnboost::iterator and which redefine difference_type.
+// 11 Feb 2001 - Clean away code which can never be used (David Abrahams)
+// 09 Feb 2001 - Always have a definition for each traits member, even if it
+//               can't be properly deduced. These will be incomplete types in
+//               some cases (undefined<void>), but it helps suppress MSVC errors
+//               elsewhere (David Abrahams)
+// 07 Feb 2001 - Support for more of the traits members where possible, making
+//               this useful as a replacement for std::iterator_traits<T> when
+//               used as a default template parameter.
+// 06 Feb 2001 - Removed useless #includes of standard library headers
+//               (David Abrahams)
+
+#ifndef ITERATOR_DWA122600_HPP_
+# define ITERATOR_DWA122600_HPP_
+
+# include <ndnboost/config.hpp>
+# include <iterator>
+
+// STLPort 4.0 and betas have a bug when debugging is enabled and there is no
+// partial specialization: instead of an iterator_category typedef, the standard
+// container iterators have _Iterator_category.
+//
+// Also, whether debugging is enabled or not, there is a broken specialization
+// of std::iterator<output_iterator_tag,void,void,void,void> which has no
+// typedefs but iterator_category.
+# if defined(__SGI_STL_PORT)
+
+#  if (__SGI_STL_PORT <= 0x410) && !defined(__STL_CLASS_PARTIAL_SPECIALIZATION) && defined(__STL_DEBUG)
+#   define BOOST_BAD_CONTAINER_ITERATOR_CATEGORY_TYPEDEF
+#  endif
+
+#  define BOOST_BAD_OUTPUT_ITERATOR_SPECIALIZATION
+
+# endif // STLPort <= 4.1b4 && no partial specialization
+
+# if !defined(BOOST_NO_STD_ITERATOR_TRAITS)             \
+  && !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) \
+  && !defined(BOOST_MSVC_STD_ITERATOR)
+    
+namespace ndnboost { namespace detail {
+
+// Define a new template so it can be specialized
+template <class Iterator>
+struct iterator_traits
+    : std::iterator_traits<Iterator>
+{};
+using std::distance;
+
+}} // namespace ndnboost::detail
+
+# else
+
+#  if  !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)  \
+    && !defined(BOOST_MSVC_STD_ITERATOR)
+
+// This is the case where everything conforms except BOOST_NO_STD_ITERATOR_TRAITS
+
+namespace ndnboost { namespace detail {
+
+// Rogue Wave Standard Library fools itself into thinking partial
+// specialization is missing on some platforms (e.g. Sun), so fails to
+// supply iterator_traits!
+template <class Iterator>
+struct iterator_traits
+{
+    typedef typename Iterator::value_type value_type;
+    typedef typename Iterator::reference reference;
+    typedef typename Iterator::pointer pointer;
+    typedef typename Iterator::difference_type difference_type;
+    typedef typename Iterator::iterator_category iterator_category;
+};
+
+template <class T>
+struct iterator_traits<T*>
+{
+    typedef T value_type;
+    typedef T& reference;
+    typedef T* pointer;
+    typedef std::ptrdiff_t difference_type;
+    typedef std::random_access_iterator_tag iterator_category;
+};
+
+template <class T>
+struct iterator_traits<T const*>
+{
+    typedef T value_type;
+    typedef T const& reference;
+    typedef T const* pointer;
+    typedef std::ptrdiff_t difference_type;
+    typedef std::random_access_iterator_tag iterator_category;
+};
+
+}} // namespace ndnboost::detail
+
+#  else
+
+# include <ndnboost/type_traits/remove_const.hpp>
+# include <ndnboost/type_traits/detail/yes_no_type.hpp>
+# include <ndnboost/type_traits/is_pointer.hpp>
+
+# ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+#  include <ndnboost/type_traits/is_same.hpp>
+#  include <ndnboost/type_traits/remove_pointer.hpp>
+# endif
+# ifdef BOOST_BAD_OUTPUT_ITERATOR_SPECIALIZATION
+#  include <ndnboost/type_traits/is_base_and_derived.hpp>
+# endif
+
+# include <ndnboost/mpl/if.hpp>
+# include <ndnboost/mpl/has_xxx.hpp>
+# include <cstddef>
+
+// should be the last #include
+# include "ndnboost/type_traits/detail/bool_trait_def.hpp"
+
+namespace ndnboost { namespace detail {
+
+BOOST_MPL_HAS_XXX_TRAIT_DEF(value_type)
+BOOST_MPL_HAS_XXX_TRAIT_DEF(reference)
+BOOST_MPL_HAS_XXX_TRAIT_DEF(pointer)
+BOOST_MPL_HAS_XXX_TRAIT_DEF(difference_type)
+BOOST_MPL_HAS_XXX_TRAIT_DEF(iterator_category)
+
+// is_mutable_iterator --
+//
+//   A metafunction returning true iff T is a mutable iterator type
+//   with a nested value_type. Will only work portably with iterators
+//   whose operator* returns a reference, but that seems to be OK for
+//   the iterators supplied by Dinkumware. Some input iterators may
+//   compile-time if they arrive here, and if the compiler is strict
+//   about not taking the address of an rvalue.
+
+// This one detects ordinary mutable iterators - the result of
+// operator* is convertible to the value_type.
+template <class T>
+type_traits::yes_type is_mutable_iterator_helper(T const*, BOOST_DEDUCED_TYPENAME T::value_type*);
+
+// Since you can't take the address of an rvalue, the guts of
+// is_mutable_iterator_impl will fail if we use &*t directly.  This
+// makes sure we can still work with non-lvalue iterators.
+template <class T> T* mutable_iterator_lvalue_helper(T& x);
+int mutable_iterator_lvalue_helper(...);
+
+
+// This one detects output iterators such as ostream_iterator which
+// return references to themselves.
+template <class T>
+type_traits::yes_type is_mutable_iterator_helper(T const*, T const*);
+
+type_traits::no_type is_mutable_iterator_helper(...);
+
+template <class T>
+struct is_mutable_iterator_impl
+{
+    static T t;
+    
+    BOOST_STATIC_CONSTANT(
+        bool, value = sizeof(
+            detail::is_mutable_iterator_helper(
+                (T*)0
+              , mutable_iterator_lvalue_helper(*t) // like &*t
+            ))
+        == sizeof(type_traits::yes_type)
+    );
+};
+
+BOOST_TT_AUX_BOOL_TRAIT_DEF1(
+    is_mutable_iterator,T,::ndnboost::detail::is_mutable_iterator_impl<T>::value)
+
+
+// is_full_iterator_traits --
+//
+//   A metafunction returning true iff T has all the requisite nested
+//   types to satisfy the requirements for a fully-conforming
+//   iterator_traits implementation.
+template <class T>
+struct is_full_iterator_traits_impl
+{
+    enum { value = 
+           has_value_type<T>::value 
+           & has_reference<T>::value 
+           & has_pointer<T>::value 
+           & has_difference_type<T>::value
+           & has_iterator_category<T>::value
+    };
+};
+
+BOOST_TT_AUX_BOOL_TRAIT_DEF1(
+    is_full_iterator_traits,T,::ndnboost::detail::is_full_iterator_traits_impl<T>::value)
+
+
+#   ifdef BOOST_BAD_CONTAINER_ITERATOR_CATEGORY_TYPEDEF
+BOOST_MPL_HAS_XXX_TRAIT_DEF(_Iterator_category)
+    
+// is_stlport_40_debug_iterator --
+//
+//   A metafunction returning true iff T has all the requisite nested
+//   types to satisfy the requirements of an STLPort 4.0 debug iterator
+//   iterator_traits implementation.
+template <class T>
+struct is_stlport_40_debug_iterator_impl
+{
+    enum { value = 
+           has_value_type<T>::value 
+           & has_reference<T>::value 
+           & has_pointer<T>::value 
+           & has_difference_type<T>::value
+           & has__Iterator_category<T>::value
+    };
+};
+
+BOOST_TT_AUX_BOOL_TRAIT_DEF1(
+    is_stlport_40_debug_iterator,T,::ndnboost::detail::is_stlport_40_debug_iterator_impl<T>::value)
+
+template <class T>
+struct stlport_40_debug_iterator_traits
+{
+    typedef typename T::value_type value_type;
+    typedef typename T::reference reference;
+    typedef typename T::pointer pointer;
+    typedef typename T::difference_type difference_type;
+    typedef typename T::_Iterator_category iterator_category;
+};
+#   endif // BOOST_BAD_CONTAINER_ITERATOR_CATEGORY_TYPEDEF 
+
+template <class T> struct pointer_iterator_traits;
+
+#   ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+template <class T>
+struct pointer_iterator_traits<T*>
+{
+    typedef typename remove_const<T>::type value_type;
+    typedef T* pointer;
+    typedef T& reference;
+    typedef std::random_access_iterator_tag iterator_category;
+    typedef std::ptrdiff_t difference_type;
+};
+#   else
+
+// In case of no template partial specialization, and if T is a
+// pointer, iterator_traits<T>::value_type can still be computed.  For
+// some basic types, remove_pointer is manually defined in
+// type_traits/broken_compiler_spec.hpp. For others, do it yourself.
+
+template<class P> class please_invoke_BOOST_TT_BROKEN_COMPILER_SPEC_on_cv_unqualified_pointee;
+
+template<class P>
+struct pointer_value_type
+  : mpl::if_<
+        is_same<P, typename remove_pointer<P>::type>
+      , please_invoke_BOOST_TT_BROKEN_COMPILER_SPEC_on_cv_unqualified_pointee<P>
+      , typename remove_const<
+            typename remove_pointer<P>::type
+        >::type
+    >
+{
+};
+
+
+template<class P>
+struct pointer_reference
+  : mpl::if_<
+        is_same<P, typename remove_pointer<P>::type>
+      , please_invoke_BOOST_TT_BROKEN_COMPILER_SPEC_on_cv_unqualified_pointee<P>
+      , typename remove_pointer<P>::type&
+    >
+{
+};
+
+template <class T>
+struct pointer_iterator_traits
+{
+    typedef T pointer;
+    typedef std::random_access_iterator_tag iterator_category;
+    typedef std::ptrdiff_t difference_type;
+
+    typedef typename pointer_value_type<T>::type value_type;
+    typedef typename pointer_reference<T>::type reference;
+};
+
+#   endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+
+// We'll sort iterator types into one of these classifications, from which we
+// can determine the difference_type, pointer, reference, and value_type
+template <class Iterator>
+struct standard_iterator_traits
+{
+    typedef typename Iterator::difference_type difference_type;
+    typedef typename Iterator::value_type value_type;
+    typedef typename Iterator::pointer pointer;
+    typedef typename Iterator::reference reference;
+    typedef typename Iterator::iterator_category iterator_category;
+};
+
+template <class Iterator>
+struct msvc_stdlib_mutable_traits
+    : std::iterator_traits<Iterator>
+{
+    typedef typename std::iterator_traits<Iterator>::distance_type difference_type;
+    typedef typename std::iterator_traits<Iterator>::value_type* pointer;
+    typedef typename std::iterator_traits<Iterator>::value_type& reference;
+};
+
+template <class Iterator>
+struct msvc_stdlib_const_traits
+    : std::iterator_traits<Iterator>
+{
+    typedef typename std::iterator_traits<Iterator>::distance_type difference_type;
+    typedef const typename std::iterator_traits<Iterator>::value_type* pointer;
+    typedef const typename std::iterator_traits<Iterator>::value_type& reference;
+};
+
+#   ifdef BOOST_BAD_OUTPUT_ITERATOR_SPECIALIZATION
+template <class Iterator>
+struct is_bad_output_iterator
+    : is_base_and_derived<
+        std::iterator<std::output_iterator_tag,void,void,void,void>
+        , Iterator>
+{
+};
+
+struct bad_output_iterator_traits
+{
+    typedef void value_type;
+    typedef void difference_type;
+    typedef std::output_iterator_tag iterator_category;
+    typedef void pointer;
+    typedef void reference;
+};
+#   endif
+
+// If we're looking at an MSVC6 (old Dinkumware) ``standard''
+// iterator, this will generate an appropriate traits class. 
+template <class Iterator>
+struct msvc_stdlib_iterator_traits
+    : mpl::if_<
+       is_mutable_iterator<Iterator>
+       , msvc_stdlib_mutable_traits<Iterator>
+       , msvc_stdlib_const_traits<Iterator>
+      >::type
+{};
+
+template <class Iterator>
+struct non_pointer_iterator_traits
+    : mpl::if_<
+        // if the iterator contains all the right nested types...
+        is_full_iterator_traits<Iterator>
+        // Use a standard iterator_traits implementation
+        , standard_iterator_traits<Iterator>
+#   ifdef BOOST_BAD_CONTAINER_ITERATOR_CATEGORY_TYPEDEF
+        // Check for STLPort 4.0 broken _Iterator_category type
+        , mpl::if_<
+             is_stlport_40_debug_iterator<Iterator>
+             , stlport_40_debug_iterator_traits<Iterator>
+#   endif
+        // Otherwise, assume it's a Dinkum iterator
+        , msvc_stdlib_iterator_traits<Iterator>
+#   ifdef BOOST_BAD_CONTAINER_ITERATOR_CATEGORY_TYPEDEF
+        >::type
+#   endif 
+    >::type
+{
+};
+
+template <class Iterator>
+struct iterator_traits_aux
+    : mpl::if_<
+        is_pointer<Iterator>
+        , pointer_iterator_traits<Iterator>
+        , non_pointer_iterator_traits<Iterator>
+    >::type
+{
+};
+
+template <class Iterator>
+struct iterator_traits
+{
+    // Explicit forwarding from base class needed to keep MSVC6 happy
+    // under some circumstances.
+ private:
+#   ifdef BOOST_BAD_OUTPUT_ITERATOR_SPECIALIZATION
+    typedef 
+    typename mpl::if_<
+        is_bad_output_iterator<Iterator>
+        , bad_output_iterator_traits
+        , iterator_traits_aux<Iterator>
+    >::type base;
+#   else
+    typedef iterator_traits_aux<Iterator> base;
+#   endif
+ public:
+    typedef typename base::value_type value_type;
+    typedef typename base::pointer pointer;
+    typedef typename base::reference reference;
+    typedef typename base::difference_type difference_type;
+    typedef typename base::iterator_category iterator_category;
+};
+
+// This specialization cuts off ETI (Early Template Instantiation) for MSVC.
+template <> struct iterator_traits<int>
+{
+    typedef int value_type;
+    typedef int pointer;
+    typedef int reference;
+    typedef int difference_type;
+    typedef int iterator_category;
+};
+
+}} // namespace ndnboost::detail
+
+#  endif // workarounds
+
+namespace ndnboost { namespace detail {
+
+namespace iterator_traits_
+{
+  template <class Iterator, class Difference>
+  struct distance_select
+  {
+      static Difference execute(Iterator i1, const Iterator i2, ...)
+      {
+          Difference result = 0;
+          while (i1 != i2)
+          {
+              ++i1;
+              ++result;
+          }
+          return result;
+      }
+
+      static Difference execute(Iterator i1, const Iterator i2, std::random_access_iterator_tag*)
+      {
+          return i2 - i1;
+      }
+  };
+} // namespace ndnboost::detail::iterator_traits_
+
+template <class Iterator>
+inline typename iterator_traits<Iterator>::difference_type
+distance(Iterator first, Iterator last)
+{
+    typedef typename iterator_traits<Iterator>::difference_type diff_t;
+    typedef typename ::ndnboost::detail::iterator_traits<Iterator>::iterator_category iterator_category;
+    
+    return iterator_traits_::distance_select<Iterator,diff_t>::execute(
+        first, last, (iterator_category*)0);
+}
+
+}}
+
+# endif
+
+
+# undef BOOST_BAD_CONTAINER_ITERATOR_CATEGORY_TYPEDEF
+# undef BOOST_BAD_OUTPUT_ITERATOR_SPECIALIZATION
+
+#endif // ITERATOR_DWA122600_HPP_