+#ifndef INCLUDE__Interpreter_hxx_
+#define INCLUDE__Interpreter_hxx_
+
+#include <string>
+#include <sstream>
+
+class Interpreter {
+public:
+ virtual int evaluate(const std::string& command,
+ std::ostream& stdout,
+ std::ostream& stderr,
+ std::string& result) = 0;
+private:
+};
+
+#endif /* INCLUDE__Interpreter_hxx_ */