1 files changed, 18 insertions, 2 deletions
diff --git a/evaluator.h b/evaluator.h
index f3bbe41..e64f27b 100644
--- a/evaluator.h
+++ b/evaluator.h
@@ -2,11 +2,27 @@
 #ifndef EVALUATOR_H_
 #define EVALUATOR_H_
 
-class value;
+#include <string>
+
+#include "value.h"
 
 class evaluator {
 public:
-	virtual void evaluate(value l, value r);
+	evaluator(const char * display_name);
+	virtual value * evaluate(
+		value * l,
+		value * r);
+
+	virtual std::string to_string();
+private:
+	const char * m_display_name;
 };
 
+class add_evaluator : public evaluator{
+public:
+	add_evaluator();
+	value * evaluate(
+		float_value * l,
+		float_value * r);
+};
 #endif //EVALUATOR_H_