Pull in some dependencies of Boost.Range.

boost/iterator.hpp

@@ -0,0 +1,20 @@
+//  (C) Copyright Beman Dawes 2000. 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_HPP
+#define BOOST_ITERATOR_HPP
+
+// This header is obsolete and will be deprecated.
+
+#include <iterator>
+#include <cstddef>           // std::ptrdiff_t
+
+namespace boost
+{
+
+using std::iterator;
+
+} // namespace boost
+
+#endif // BOOST_ITERATOR_HPP