diff -r e8563dcaefca -r 56ebe2a31b5b stage4/generate_c/generate_c_sfc.cc
--- a/stage4/generate_c/generate_c_sfc.cc	Mon Apr 03 22:06:40 2017 +0100
+++ b/stage4/generate_c/generate_c_sfc.cc	Mon Apr 03 22:18:22 2017 +0100
@@ -443,7 +443,7 @@
           for(int i = 0; i < symbol->n; i++) {
             s4o.print(GET_VAR);
             s4o.print("(");
-            print_step_argument(symbol->elements[i], "X");
+            print_step_argument(symbol->get_element(i), "X");
             s4o.print(")");
             if (i < symbol->n - 1) {
               s4o.print(" && ");
@@ -452,12 +452,12 @@
           break;
         case stepset_sg:
           for(int i = 0; i < symbol->n; i++) {
-            print_set_step(symbol->elements[i]);
+            print_set_step(symbol->get_element(i));
           }
           break;
         case stepreset_sg:
           for(int i = 0; i < symbol->n; i++) {
-            print_reset_step(symbol->elements[i]);
+            print_reset_step(symbol->get_element(i));
           }
           break;
         default:
@@ -710,8 +710,8 @@
       
       generate_c_sfc_elements->reset_transition_number();
       for(i = 0; i < symbol->n; i++) {
-        symbol->elements[i]->accept(*this);
-        generate_c_sfc_elements->generate(symbol->elements[i], generate_c_sfc_elements_c::transitionlist_sg);
+        symbol->get_element(i)->accept(*this);
+        generate_c_sfc_elements->generate(symbol->get_element(i), generate_c_sfc_elements_c::transitionlist_sg);
       }
       
       s4o.print(s4o.indent_spaces +"INT i;\n");
@@ -853,7 +853,7 @@
       s4o.print(s4o.indent_spaces + "// Transitions reset steps\n");
       generate_c_sfc_elements->reset_transition_number();
       for(i = 0; i < symbol->n; i++) {
-        generate_c_sfc_elements->generate(symbol->elements[i], generate_c_sfc_elements_c::stepreset_sg);
+        generate_c_sfc_elements->generate(symbol->get_element(i), generate_c_sfc_elements_c::stepreset_sg);
       }
       s4o.print("\n");
       
@@ -861,14 +861,14 @@
       s4o.print(s4o.indent_spaces + "// Transitions set steps\n");
       generate_c_sfc_elements->reset_transition_number();
       for(i = 0; i < symbol->n; i++) {
-        generate_c_sfc_elements->generate(symbol->elements[i], generate_c_sfc_elements_c::stepset_sg);
+        generate_c_sfc_elements->generate(symbol->get_element(i), generate_c_sfc_elements_c::stepset_sg);
       }
       s4o.print("\n");
       
       /* generate step association */
       s4o.print(s4o.indent_spaces + "// Steps association\n");
       for(i = 0; i < symbol->n; i++) {
-        generate_c_sfc_elements->generate(symbol->elements[i], generate_c_sfc_elements_c::actionassociation_sg);
+        generate_c_sfc_elements->generate(symbol->get_element(i), generate_c_sfc_elements_c::actionassociation_sg);
       }
       s4o.print("\n");
       
@@ -967,7 +967,7 @@
         }
       }
       for(i = 0; i < symbol->n; i++) {
-        generate_c_sfc_elements->generate(symbol->elements[i], generate_c_sfc_elements_c::actionbody_sg);
+        generate_c_sfc_elements->generate(symbol->get_element(i), generate_c_sfc_elements_c::actionbody_sg);
       }
       s4o.print("\n");