1 files changed, 10 insertions, 8 deletions

diff --git a/NodeInput.h b/NodeInput.h
index 71cf36c..23a5e14 100644
--- a/NodeInput.h
+++ b/NodeInput.h
@@ -4,22 +4,25 @@
 
 class NodeInput : public Node {
 public:
-   NodeInput() = default;
+	NodeInput() = default;
 	NodeInput(const NodeInput * prototype);
 	~NodeInput() = default;
 	virtual void sim();
-	SignalLevel level() { return UNDEFINED; };
+	SignalLevel level();
 	virtual NodeInput * clone() const;
 
-private:
+protected:
 	NodeInput(const char * type);
 
-SignalLevel input = UNDEFINED;
+private:
+	SignalLevel input = UNDEFINED;
 };
 
 // Input LOW and HIGH unicorns:
 
 class NodeInputLow : public NodeInput {
+	using NodeInput::NodeInput;
+
 public:
 	// NodeInputLow(const NodeInputLow * prototype);
 	// ~NodeInputLow() = default;
@@ -27,18 +30,17 @@ public:
 	// virtual NodeInputLow * clone() const;
 
 private:
-	NodeInputLow(const char * type);
 	constexpr static const char * type = "input_low";
 	static NodeInputLow instance;
 
-   SignalLevel input = LOW;
+	SignalLevel input = LOW;
 };
 
 class NodeInputHigh : public NodeInput {
 private:
-   NodeInputHigh(const char * type);
+	using NodeInput::NodeInput;
 	constexpr static const char * type = "input_high";
 	static NodeInputHigh instance;
 
-   SignalLevel input = HIGH;
+	SignalLevel input = HIGH;
 };