diff --git a/trick_source/codegen/Interface_Code_Gen/FieldDescription.cpp b/trick_source/codegen/Interface_Code_Gen/FieldDescription.cpp
index 359b9463..f1cd4784 100644
--- a/trick_source/codegen/Interface_Code_Gen/FieldDescription.cpp
+++ b/trick_source/codegen/Interface_Code_Gen/FieldDescription.cpp
@@ -398,6 +398,26 @@ unsigned int FieldDescription::getIO() {
     return io ;
 }
 
+unsigned int FieldDescription::getChkpntIO() {
+    return io >> 2 & 3 ;
+}
+
+bool FieldDescription::isWriteable() {
+    return io & 1;
+}
+
+bool FieldDescription::isReadable() {
+    return io & 2;
+}
+
+bool FieldDescription::isCheckpointable() {
+    return io & 4;
+}
+
+bool FieldDescription::isRestorable() {
+    return io & 8;
+}
+
 std::string FieldDescription::getDescription() {
     return description ;
 }
diff --git a/trick_source/codegen/Interface_Code_Gen/FieldDescription.hh b/trick_source/codegen/Interface_Code_Gen/FieldDescription.hh
index 811398ea..dff5fe86 100644
--- a/trick_source/codegen/Interface_Code_Gen/FieldDescription.hh
+++ b/trick_source/codegen/Interface_Code_Gen/FieldDescription.hh
@@ -58,6 +58,11 @@ class FieldDescription : public ConstructValues {
         bool isDashDashUnits() ;
         void setIO(unsigned int) ;
         unsigned int getIO() ;
+        unsigned int getChkpntIO() ;
+        bool isReadable() ;
+        bool isWriteable();
+        bool isCheckpointable();
+        bool isRestorable();
         std::string getDescription() ;
         void setEnumString(std::string) ;
         std::string getEnumString() ;
diff --git a/trick_source/codegen/Interface_Code_Gen/PrintFileContents10.cpp b/trick_source/codegen/Interface_Code_Gen/PrintFileContents10.cpp
index 211a78ae..4cb79352 100644
--- a/trick_source/codegen/Interface_Code_Gen/PrintFileContents10.cpp
+++ b/trick_source/codegen/Interface_Code_Gen/PrintFileContents10.cpp
@@ -166,12 +166,16 @@ void PrintFileContents10::print_field_init_attr_stmts( std::ostream & ostream ,
             ostream << prefix << field << " = " << field << "_" << fullyQualifiedMangledClassNameUnderscores + "_" + fieldName + " ;\n";
         };
 
-        print("checkpoint_stl");
-        print("post_checkpoint_stl");
-        print("restore_stl");
+        if ( fdes->isCheckpointable() ) {
+            print("checkpoint_stl");
+            print("post_checkpoint_stl");
+        }
 
-        if ( fdes->hasSTLClear() ) {
-            print("clear_stl");
+        if ( fdes->isRestorable() ) {
+            print("restore_stl");
+            if ( fdes->hasSTLClear() ) {
+                print("clear_stl");
+            }
         }
     }
 
@@ -299,37 +303,6 @@ void PrintFileContents10::print_io_src_delete( std::ostream & ostream , ClassVal
     }
 }
 
-void PrintFileContents10::print_stl_helper_proto(std::ostream & ostream , ClassValues * cv ) {
-    auto& fieldDescriptions = cv->getFieldDescriptions();
-
-    if (!fieldDescriptions.size()) {
-        return;
-    }
-
-    print_open_extern_c(ostream) ;
-
-    for (auto& field : cv->getFieldDescriptions()) {
-        if ( field->isSTL() and determinePrintAttr(cv, field) ) {
-            const std::string classAndFieldName = cv->getFullyQualifiedMangledTypeName("__") + "_" + field->getName();
-
-            auto print = [&](const std::string& name) {
-                ostream << "void " << name << "_" << classAndFieldName
-                    << "(void* start_address, const char* obj_name , const char* var_name);" << std::endl ;
-            };
-
-            print("checkpoint_stl");
-            print("post_checkpoint_stl");
-            print("restore_checkpoint_stl");
-
-            if ( field->hasSTLClear() ) {
-                ostream << "void clear_stl_" << classAndFieldName << "(void* start_address);" << std::endl ;
-            }
-        }
-    }
-
-    print_close_extern_c(ostream) ;
-}
-
 void PrintFileContents10::print_checkpoint_stl(std::ostream & ostream , FieldDescription * fdes , ClassValues * cv ) {
     printStlFunction("checkpoint", "void* start_address, const char* obj_name , const char* var_name", "checkpoint_stl(*stl, obj_name, var_name)", ostream, *fdes, *cv);
 }
@@ -357,11 +330,15 @@ void PrintFileContents10::print_stl_helper(std::ostream & ostream , ClassValues
 
     for (auto& field : fieldDescriptions) {
         if ( field->isSTL() and determinePrintAttr(cv, field) ) {
-            print_checkpoint_stl(ostream, field, cv) ;
-            print_post_checkpoint_stl(ostream, field, cv) ;
-            print_restore_stl(ostream, field, cv) ;
-            if (field->hasSTLClear()) {
-                print_clear_stl(ostream, field, cv) ;
+            if (field->isCheckpointable()) {
+                print_checkpoint_stl(ostream, field, cv) ;
+                print_post_checkpoint_stl(ostream, field, cv) ;
+            }
+            if (field->isRestorable()) {
+                print_restore_stl(ostream, field, cv) ;
+                if (field->hasSTLClear()) {
+                    print_clear_stl(ostream, field, cv) ;
+                }
             }
         }
     }
@@ -370,7 +347,6 @@ void PrintFileContents10::print_stl_helper(std::ostream & ostream , ClassValues
 }
 
 void PrintFileContents10::printClass( std::ostream & ostream , ClassValues * cv ) {
-    print_stl_helper_proto(ostream, cv) ;
     print_class_attr(ostream, cv) ;
     print_stl_helper(ostream, cv) ;
     print_init_attr_func(ostream, cv) ;
diff --git a/trick_source/codegen/Interface_Code_Gen/PrintFileContents10.hh b/trick_source/codegen/Interface_Code_Gen/PrintFileContents10.hh
index 96df008c..c1a4f428 100644
--- a/trick_source/codegen/Interface_Code_Gen/PrintFileContents10.hh
+++ b/trick_source/codegen/Interface_Code_Gen/PrintFileContents10.hh
@@ -86,9 +86,6 @@ class PrintFileContents10 : public PrintFileContentsBase {
         /** Prints the io_src_delete function */
         void print_io_src_delete(std::ostream & outfile , ClassValues * cv ) ;
 
-        /** Prints stl helper function prototypes */
-        void print_stl_helper_proto(std::ostream & outfile , ClassValues * in_class) ;
-
         /** Prints stl helper function */
         void print_stl_helper(std::ostream & outfile , ClassValues * in_class) ;
 
diff --git a/trick_source/codegen/Interface_Code_Gen/PrintFileContentsBase.cpp b/trick_source/codegen/Interface_Code_Gen/PrintFileContentsBase.cpp
index 0404b66e..d647cd47 100644
--- a/trick_source/codegen/Interface_Code_Gen/PrintFileContentsBase.cpp
+++ b/trick_source/codegen/Interface_Code_Gen/PrintFileContentsBase.cpp
@@ -57,31 +57,13 @@ void PrintFileContentsBase::print_close_extern_c(std::ostream & ostream) {
    on access to the field and the presense of init_attr friends.
 */
 bool PrintFileContentsBase::determinePrintAttr( ClassValues * c , FieldDescription * fdes ) {
-    if ( fdes->getTypeName().compare("void") and fdes->getIO() != 0 and fdes->getEnumString().compare("TRICK_VOID")) {
-        if ( global_compat15 or c->isCompat15()) {
-            if ( fdes->isInherited() ) {
-                return ((c->getHasInitAttrFriend() && fdes->getAccess() == clang::AS_protected)
-                     || (fdes->getAccess() == clang::AS_public)) ;
-            } else {
-                return (c->getHasInitAttrFriend()
-                    || (fdes->getAccess() == clang::AS_public)) ;
-            }
-        } else {
-            if ( fdes->isStatic() ) {
-                if ( fdes->isInherited() ) {
-                    return ((c->getHasInitAttrFriend() && fdes->getAccess() == clang::AS_protected)
-                         || (fdes->getAccess() == clang::AS_public)) ;
-                } else {
-                    return (c->getHasInitAttrFriend()
-                        || (fdes->getAccess() == clang::AS_public)) ;
-                }
-            } else {
-                return true ;
-            }
-
-        }
+    if ( !fdes->getTypeName().compare("void") or !fdes->getChkpntIO() or !fdes->getEnumString().compare("TRICK_VOID")) {
+        return false;
     }
-    return false ;
+    if ( fdes->getAccess() == clang::AS_public or (!fdes->isStatic() and !global_compat15 and !c->isCompat15())) {
+        return true;
+    }
+    return c->getHasInitAttrFriend() && ( !fdes->isInherited() || fdes->getAccess() == clang::AS_protected ) ;
 }
 
 std::vector<FieldDescription*> PrintFileContentsBase::getPrintableFields(ClassValues& classValues) {