1 files changed, 47 insertions, 0 deletions
diff --git a/src/third_party/boost-1.69.0/boost/range/difference_type.hpp b/src/third_party/boost-1.69.0/boost/range/difference_type.hpp
new file mode 100644
index 00000000000..6bb3c5f5520
--- /dev/null
+++ b/src/third_party/boost-1.69.0/boost/range/difference_type.hpp
@@ -0,0 +1,47 @@
+// Boost.Range library
+//
+//  Copyright Thorsten Ottosen 2003-2004. 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/
+//
+
+#ifndef BOOST_RANGE_DIFFERENCE_TYPE_HPP
+#define BOOST_RANGE_DIFFERENCE_TYPE_HPP
+
+#if defined(_MSC_VER)
+# pragma once
+#endif
+
+#include <boost/mpl/and.hpp>
+#include <boost/range/config.hpp>
+#include <boost/range/iterator.hpp>
+#include <boost/range/has_range_iterator.hpp>
+#include <boost/iterator/iterator_traits.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+
+namespace boost
+{
+    namespace range_detail
+    {
+        template< class T, bool B = has_type<range_iterator<T> >::value >
+        struct range_difference
+        { };
+
+        template< class T >
+        struct range_difference<T, true>
+          : iterator_difference<
+                BOOST_DEDUCED_TYPENAME range_iterator<T>::type
+            >
+        { };
+    }
+
+    template< class T >
+    struct range_difference
+      : range_detail::range_difference<BOOST_DEDUCED_TYPENAME remove_reference<T>::type>
+    { };
+}
+
+#endif