From ac6744fa89f99632c232db2129aedd85994104b0 Mon Sep 17 00:00:00 2001
From: Adam Wulkiewicz <adam.wulkiewicz@gmail.com>
Date: Mon, 20 Oct 2014 16:06:41 +0200
Subject: [PATCH] [algorithms] Fix unused parameter warning in
 throw_on_empty_input()

---
 .../geometry/algorithms/detail/throw_on_empty_input.hpp     | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/boost/geometry/algorithms/detail/throw_on_empty_input.hpp b/include/boost/geometry/algorithms/detail/throw_on_empty_input.hpp
index 3d83e6930..21f5fe40b 100644
--- a/include/boost/geometry/algorithms/detail/throw_on_empty_input.hpp
+++ b/include/boost/geometry/algorithms/detail/throw_on_empty_input.hpp
@@ -24,6 +24,10 @@
 // So decided that at least for Boost 1.49 this is commented for
 // scalar results, except distance.
 
+#if defined(BOOST_GEOMETRY_EMPTY_INPUT_NO_THROW)
+#include <boost/core/ignore_unused.hpp>
+#endif
+
 namespace boost { namespace geometry
 {
 
@@ -39,6 +43,8 @@ inline void throw_on_empty_input(Geometry const& geometry)
     {
         throw empty_input_exception();
     }
+#else
+    boost::ignore_unused(geometry);
 #endif
 }