From 0eac9e329b81dfe765f0bce040a8d3c4c1d7a807 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=BCrgen=20Hunold?= <jhunold@gmx.eu>
Date: Fri, 9 Apr 2010 09:04:51 +0000
Subject: [PATCH] Silence gcc warnings when using UnaryFunction with reference
 parameters.

[SVN r61152]
---
 include/boost/concept_check.hpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/boost/concept_check.hpp b/include/boost/concept_check.hpp
index 12ec2ad..f051c72 100644
--- a/include/boost/concept_check.hpp
+++ b/include/boost/concept_check.hpp
@@ -330,7 +330,15 @@ namespace boost
       {
           f(arg);
       }
-      
+
+#if BOOST_WORKAROUND(__GNUC__, BOOST_TESTED_AT(4))
+      // Declare a dummy construktor to make gcc happy.
+      // It seems the compiler can not generate a sensible constructor when this is instantiated with a refence type.
+      // (warning: non-static reference "const double& boost::UnaryFunction<YourClassHere>::arg"
+      // in class without a constructor [-Wuninitialized])
+      UnaryFunction();
+#endif
+
       Func f;
       Arg arg;
   };