Fixed warning in visual studio

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%402825

examples/pipe_ex_2.cpp

@@ -132,7 +132,7 @@ int main()
     tsu_type msg;
 
     // Treat our msg as a float and assign it 4.567
-    msg.get<float>() = 4.567;
+    msg.get<float>() = 4.567f;
     // Now put the message into the pipe
     pe.message_pipe.enqueue(msg);