Add forward decleration helpers

Makefile.am

@@ -17,6 +17,7 @@ UTIL_INCLUDE =  \
     except.hpp  	\
     fixed.hpp		\
     float.hpp		\
+    fwd.hpp		\
     guid.hpp		\
     io.hpp		\
     ip.hpp		\

fwd.hpp

@@ -0,0 +1,27 @@
+/*
+ * This file is part of libgim.
+ *
+ * libgim is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * libgim is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with libgim.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright 2010 Danny Robson <danny@blubinc.net>
+ */
+
+#ifndef __UTIL_FWD_HPP
+#define __UTIL_FWD_HPP
+
+#define DEFINE_STRUCT(x) struct x;
+#define DEFINE_CLASS(x)  class  x;
+
+#endif
+