X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fcontainer.h;h=d1120cd8c36bb1e25fb845f6a20831cc264c057c;hb=c1faa54a3218b53757b8b55de0ff8aa64412253b;hp=66884652fc4da3bb80097d90c0f167d05d06ef95;hpb=8352d5f2590cfcb09e92854be211399105408c4d;p=libs%2Fgltk.git

diff --git a/source/container.h b/source/container.h
index 6688465..d1120cd 100644
--- a/source/container.h
+++ b/source/container.h
@@ -2,12 +2,21 @@
 #define MSP_GLTK_CONTAINER_H_
 
 #include <list>
+#include <stdexcept>
 #include <sigc++/trackable.h>
 #include "widget.h"
 
 namespace Msp {
 namespace GLtk {
 
+class hierarchy_error: public std::logic_error
+{
+public:
+	hierarchy_error(const std::string &);
+	virtual ~hierarchy_error() throw() { }
+};
+
+
 class Container: virtual public Widget
 {
 protected: