1 files changed, 16 insertions, 0 deletions
diff --git a/impl/Operator.hpp b/impl/Operator.hpp
new file mode 100644
index 0000000..f9a80f3
--- /dev/null
+++ b/impl/Operator.hpp
@@ -0,0 +1,16 @@
+#ifndef OPERATOR_H
+#define OPERATOR_H
+
+#include <map>
+#include <string>
+#include <vector>
+#include "Expression.hpp"
+
+template<typename T>
+struct Operator {
+  virtual const T eval(const std::vector< Expression<T> >&, const std::map<std::string, T>&) const = 0;
+};
+
+#include "Expression.hpp"
+
+#endif