Added fl (frame layout) to wxWindows, from source tidied by Hans Van Leemputten <Hansvl@softhome.net>.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@11170 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

contrib/include/wx/fl/garbagec.h

@@ -0,0 +1,74 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        No names yet.
+// Purpose:     Contrib. demo
+// Author:      Aleksandras Gluchovas (@Lithuania)
+// Modified by:
+// Created:     ??/10/98
+// RCS-ID:      $Id$
+// Copyright:   (c) Aleksandras Gluchovas
+// Licence:   	wxWindows license
+/////////////////////////////////////////////////////////////////////////////
+
+#ifndef __GARBAGEC_G__
+#define __GARBAGEC_G__
+
+#ifdef __GNUG__
+    #pragma interface "garbagec.h"
+#endif
+
+#include "wx/list.h"
+
+struct GCItem
+{
+	void*	  mpObj;
+	wxList    mRefs;   // references to other nodes
+};
+
+inline void* gc_node_to_obj( wxNode* pGCNode )
+{
+	return ( (GCItem*) (pGCNode->Data()) )->mpObj;
+}
+
+// class implements extremely slow, but probably one of the most simple GC algorithms
+
+class GarbageCollector
+{
+protected:
+	wxList mAllNodes;
+	wxList mRegularLst;
+	wxList mCycledLst;
+
+	wxNode* FindItemNode( void* pForObj );
+	void    ResolveReferences();
+
+	wxNode* FindReferenceFreeItemNode();
+	void    RemoveReferencesToNode( wxNode* pItemNode );
+	void    DestroyItemList( wxList& lst );
+
+public:
+
+	GarbageCollector() {}
+
+	virtual ~GarbageCollector();
+
+	// prepare data for GC alg.
+
+	virtual void AddObject( void* pObj, int refCnt = 1 );
+	virtual void AddDependency( void* pObj, void* pDependsOnObj );
+
+	// executes GC alg.
+
+	virtual void ArrangeCollection();
+
+	// access results of the alg.
+
+	wxList& GetRegularObjects();
+	wxList& GetCycledObjects();
+
+	// removes all data from GC
+
+	void Reset();
+};
+
+#endif /* __GARBAGEC_G__ */
+