1 files changed, 5 insertions, 2 deletions
diff --git a/GateNand.h b/GateNand.h
index 5ed9956..fb9d788 100644
--- a/GateNand.h
+++ b/GateNand.h
@@ -4,13 +4,16 @@
 #include "GateAnd.h"
 
 class GateNand : public GateAnd {
-	using GateAnd::GateAnd;
+public:
+	virtual GateNand * clone() const;
 
 protected:
 	SignalLevel level();
+	using GateAnd::GateAnd;
 
 private:
-	GateNand(const char * type);
+	GateNand(const GateNand *) : GateAnd() {}
+	// GateNand(const char * type);
 	constexpr static const char * type = "nand";
 	static GateNand instance;
 };