From ed17a8f57dcbe180e77593c95166e3d335fda38b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Philipp=20M=C3=B6ller?= <bootsarehax@gmail.com>
Date: Tue, 2 Feb 2016 15:24:43 +0100
Subject: [PATCH] Add free dual function

---
 BGL/include/CGAL/boost/graph/Dual.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/BGL/include/CGAL/boost/graph/Dual.h b/BGL/include/CGAL/boost/graph/Dual.h
index 8da49913742..0975b885738 100644
--- a/BGL/include/CGAL/boost/graph/Dual.h
+++ b/BGL/include/CGAL/boost/graph/Dual.h
@@ -66,6 +66,15 @@ public:
   { return primal_; }
 };
 
+
+/*!
+  Construct a `Dual` from a given `primal`.
+  \relates CGAL::Dual
+ */
+template<typename Primal>
+Dual<Primal> dual(const Primal& primal)
+{ return Dual<Primal>(primal); }
+
 } // namespace CGAL
 
 namespace boost {