From def441d02daf62d4fb14b8acef175bde4e637fc6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=BCrgen=20Hunold?= <jhunold@gmx.eu>
Date: Sun, 11 Apr 2010 15:52:27 +0000
Subject: [PATCH] Merged revisions 61152,61185 via svnmerge from
 https://svn.boost.org/svn/boost/trunk

........
  r61152 | jhunold | 2010-04-09 11:04:51 +0200 (Fr, 09 Apr 2010) | 2 lines

  Silence gcc warnings when using UnaryFunction with reference parameters.
........
  r61185 | jhunold | 2010-04-10 19:50:26 +0200 (Sa, 10 Apr 2010) | 2 lines

  Dummy-Constructor only for gcc > 4.
........


[SVN r61205]
---
 include/boost/concept_check.hpp | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/include/boost/concept_check.hpp b/include/boost/concept_check.hpp
index 12ec2ad..7ee3036 100644
--- a/include/boost/concept_check.hpp
+++ b/include/boost/concept_check.hpp
@@ -330,7 +330,16 @@ namespace boost
       {
           f(arg);
       }
-      
+
+#if (BOOST_WORKAROUND(__GNUC__, BOOST_TESTED_AT(4) \
+                      && BOOST_WORKAROUND(__GNUC__, > 3)))
+      // 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;
   };