Pull in some dependencies of Boost.Range.

boost/dynamic_bitset_fwd.hpp

@@ -0,0 +1,25 @@
+// -----------------------------------------------------------
+//
+//   Copyright (c) 2001-2002 Chuck Allison and Jeremy Siek
+//            Copyright (c) 2003-2004 Gennaro Prota
+//
+// 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_DYNAMIC_BITSET_FWD_HPP
+#define BOOST_DYNAMIC_BITSET_FWD_HPP
+
+#include <memory>
+
+namespace boost {
+
+template <typename Block = unsigned long,
+          typename Allocator = std::allocator<Block> >
+class dynamic_bitset;
+
+}
+
+#endif // include guard