New upstream version 8.1.0

fsck/source/database/Cursor.h

@@ -0,0 +1,67 @@
+#ifndef CURSOR_H_
+#define CURSOR_H_
+
+#include <boost/make_shared.hpp>
+#include <boost/shared_ptr.hpp>
+
+template<typename Obj>
+class Cursor
+{
+   public:
+      typedef Obj ElementType;
+
+   private:
+      class SourceBase
+      {
+         public:
+            virtual ~SourceBase() {}
+
+            virtual bool step() = 0;
+            virtual ElementType* get() = 0;
+      };
+
+      template<typename Inner>
+      class Source : public SourceBase
+      {
+         public:
+            Source(Inner inner)
+               : inner(inner)
+            {
+            }
+
+            bool step()
+            {
+               return inner.step();
+            }
+
+            ElementType* get()
+            {
+               return inner.get();
+            }
+
+         private:
+            Inner inner;
+      };
+
+   public:
+      template<typename Inner>
+      explicit Cursor(Inner inner)
+         : source(boost::make_shared<Source<Inner> >(inner) )
+      {
+      }
+
+      bool step()
+      {
+         return source->step();
+      }
+
+      ElementType* get()
+      {
+         return source->get();
+      }
+
+   private:
+      boost::shared_ptr<SourceBase> source;
+};
+
+#endif