From 37e4ddb10709270b346e0ead1f5e9b482946887a Mon Sep 17 00:00:00 2001
From: Andreas Fabri <andreas.fabri@geometryfactory.com>
Date: Fri, 22 Apr 2016 16:29:10 +0200
Subject: [PATCH] const&

---
 AABB_tree/include/CGAL/AABB_tree.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/AABB_tree/include/CGAL/AABB_tree.h b/AABB_tree/include/CGAL/AABB_tree.h
index 26470133277..4aa1fd6a50c 100644
--- a/AABB_tree/include/CGAL/AABB_tree.h
+++ b/AABB_tree/include/CGAL/AABB_tree.h
@@ -416,7 +416,7 @@ public:
     // call this member function.
     template<typename Ray, typename SkipFunctor = False_functor>
     boost::optional< typename Intersection_and_primitive_id<Ray>::Type >
-    first_intersection_and_primitive(const Ray& query, SkipFunctor skip = SkipFunctor()) const;
+    first_intersection_and_primitive(const Ray& query, const SkipFunctor& skip = SkipFunctor()) const;
 
 		// Returns the primitive id closest to the source point of the ray
     // query. 
@@ -432,7 +432,7 @@ public:
     // call this member function.
     template<typename Ray, typename SkipFunctor = False_functor>
     boost::optional<Primitive_id>
-		first_intersected_primitive(const Ray& query, SkipFunctor skip = SkipFunctor()) const;
+		first_intersected_primitive(const Ray& query, const SkipFunctor& skip = SkipFunctor()) const;
     ///@}
 
     /// \name Distance Queries