From 9bd171bcd1b33cb92c9dcf06b1cfe767cad800af Mon Sep 17 00:00:00 2001
From: Dane Springmeyer <dane@mapbox.com>
Date: Sat, 4 Apr 2015 13:19:55 -0400
Subject: [PATCH] geometry_is_empty should only accept const&

---
 include/mapnik/geometry_is_empty.hpp | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/mapnik/geometry_is_empty.hpp b/include/mapnik/geometry_is_empty.hpp
index 4a0f55a35..a999d76db 100644
--- a/include/mapnik/geometry_is_empty.hpp
+++ b/include/mapnik/geometry_is_empty.hpp
@@ -20,8 +20,8 @@
  *
  *****************************************************************************/
 
-#ifndef MAPNIK_GEOMETRY_EMPTY_HPP
-#define MAPNIK_GEOMETRY_EMPTY_HPP
+#ifndef MAPNIK_GEOMETRY_IS_EMPTY_HPP
+#define MAPNIK_GEOMETRY_IS_EMPTY_HPP
 
 #include <mapnik/geometry.hpp>
 
@@ -82,11 +82,11 @@ struct geometry_is_empty
 }
 
 template <typename GeomType>
-inline bool is_empty(GeomType & geom)
+inline bool is_empty(GeomType const& geom)
 {
     return detail::geometry_is_empty()(geom);
 }
 
 }}
 
-#endif // MAPNIK_GEOMETRY_EMPTY_HPP
+#endif // MAPNIK_GEOMETRY_IS_EMPTY_HPP