1 files changed, 5 insertions, 0 deletions
diff --git a/src/classdef.h b/src/classdef.h
index e23bc19..1cbf7b1 100644
--- a/src/classdef.h
+++ b/src/classdef.h
@@ -19,6 +19,7 @@
 #define CLASSDEF_H
 
 #include <vector>
+#include <set>
 
 #include <qlist.h>
 #include <qdict.h>
@@ -474,6 +475,10 @@ ClassDefMutable *createClassDef(
 
 ClassDef *createClassDefAlias(const Definition *newScope,const ClassDef *cd);
 
+// --- Set of classes
+
+using ClassDefSet = std::set<const ClassDef*>;
+
 // --- Cast functions
 
 ClassDef            *toClassDef(Definition *d);