Refactoring: move ClassDefSet to the classdef header

Author: doxygen

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);

src/context.h

@@ -503,8 +503,6 @@ class ClassHierarchyContext : public RefCountedContext, public TemplateStructInt
 
 //----------------------------------------------------
 
-using ClassDefSet = std::set<const ClassDef*>;
-
 class NestingNodeContext : public RefCountedContext, public TemplateStructIntf
 {
   public:

src/dotgfxhierarchytable.h

@@ -20,7 +20,6 @@
 #include <string>
 #include <unordered_map>
 #include <vector>
-#include <set>
 
 #include "classdef.h"
 #include "ftextstream.h"
@@ -44,7 +43,6 @@ class DotGfxHierarchyTable : public DotGraph
     virtual void computeTheGraph();
 
   private:
-    using ClassDefSet = std::set<const ClassDef*>;
     void addHierarchy(DotNode *n,const ClassDef *cd,ClassDefSet &visited);
     void addClassList(const ClassSDict *cl,ClassDefSet &visited);