Implemented generic for loops

src/Evaluator/EvalValues/EvalValue.hpp

@@ -2,11 +2,17 @@
 #ifndef PORYGONLANG_EVALVALUE_HPP
 #define PORYGONLANG_EVALVALUE_HPP
 
-#include "../../ScriptType.hpp"
-#include "../EvaluationException.hpp"
 #include <string>
 #include <sstream>
 #include <memory>
+#include "../../ScriptType.hpp"
+#include "../EvaluationException.hpp"
+namespace Porygon::Evaluation{
+    class EvalValue;
+    class Iterator;
+}
+#include "../Iterator/Iterator.hpp"
+
 
 namespace Porygon::Evaluation {
     class EvalValue {
@@ -54,6 +60,10 @@ namespace Porygon::Evaluation {
         virtual void SetIndexValue(EvalValue *key, const shared_ptr<EvalValue> &value) const {
             throw EvaluationException("Can't index this EvalValue");
         }
+
+        virtual Iterator * GetKeyIterator() const{
+            throw EvaluationException("Can't iterate over this EvalValue");
+        }
     };
 
     class BooleanEvalValue : public EvalValue {