From eb04aeb7ad255c8e76a91f46e016e60acf4a5eb9 Mon Sep 17 00:00:00 2001
From: Barend Gehrels <barend@xs4all.nl>
Date: Mon, 16 Aug 2010 07:36:10 +0000
Subject: [PATCH] Added difference_type, reported as missing on the GGL mailing
 list

[SVN r64840]
---
 include/boost/geometry/iterators/box_iterator.hpp           | 1 +
 include/boost/geometry/iterators/segment_range_iterator.hpp | 1 +
 2 files changed, 2 insertions(+)

diff --git a/include/boost/geometry/iterators/box_iterator.hpp b/include/boost/geometry/iterators/box_iterator.hpp
index f177da610..f05b15bd7 100644
--- a/include/boost/geometry/iterators/box_iterator.hpp
+++ b/include/boost/geometry/iterators/box_iterator.hpp
@@ -53,6 +53,7 @@ struct box_iterator
 private:
     friend class boost::iterator_core_access;
     typedef typename point_type<Box>::type point_type;
+    typedef std::ptrdiff_t difference_type;
 
     inline point_type const& dereference() const
     {
diff --git a/include/boost/geometry/iterators/segment_range_iterator.hpp b/include/boost/geometry/iterators/segment_range_iterator.hpp
index 396f5042c..5ac63f1b7 100644
--- a/include/boost/geometry/iterators/segment_range_iterator.hpp
+++ b/include/boost/geometry/iterators/segment_range_iterator.hpp
@@ -62,6 +62,7 @@ struct segment_range_iterator
 private:
     friend class boost::iterator_core_access;
     typedef typename point_type<Segment>::type point_type;
+    typedef std::ptrdiff_t difference_type;
 
     inline point_type const& dereference() const
     {