4 files changed, 33 insertions, 14 deletions

diff --git a/fluid/nodes/Function_Node.cxx b/fluid/nodes/Function_Node.cxx
index 3e98a898f..42c3f3996 100644
--- a/fluid/nodes/Function_Node.cxx
+++ b/fluid/nodes/Function_Node.cxx
@@ -1513,7 +1513,6 @@ Class_Node Class_Node::prototype;
  */
 Class_Node::Class_Node() :
   Node(),
-  subclass_of(nullptr),
   public_(1)
 { }
 
@@ -1521,8 +1520,6 @@ Class_Node::Class_Node() :
  Destructor.
  */
 Class_Node::~Class_Node() {
-  if (subclass_of)
-    free((void*)subclass_of);
 }
 
 /**
@@ -1549,7 +1546,7 @@ Node *Class_Node::make(Strategy strategy) {
   Class_Node *o = new Class_Node();
   o->name("UserInterface");
   o->prefix("");
-  o->subclass_of = nullptr;
+  o->base_class("");
   o->public_ = 1;
   o->add(anchor, strategy);
   o->factory = this;
@@ -1563,9 +1560,9 @@ Node *Class_Node::make(Strategy strategy) {
  */
 void Class_Node::write_properties(fld::io::Project_Writer &f) {
   Node::write_properties(f);
-  if (subclass_of) {
+  if (!base_class().empty()) {
     f.write_string(":");
-    f.write_word(subclass_of);
+    f.write_word(base_class().c_str());
   }
   switch (public_) {
     case 0: f.write_string("private"); break;
@@ -1582,7 +1579,7 @@ void Class_Node::read_property(fld::io::Project_Reader &f, const char *c) {
   } else if (!strcmp(c,"protected")) {
     public_ = 2;
   } else if (!strcmp(c,":")) {
-    storestring(f.read_word(), subclass_of);
+    base_class(f.read_word());
   } else {
     Node::read_property(f, c);
   }
@@ -1608,7 +1605,9 @@ void Class_Node::write_code1(fld::io::Code_Writer& f) {
     f.write_h("class %s %s ", prefix().c_str(), name());
   else
     f.write_h("class %s ", name());
-  if (subclass_of) f.write_h(": %s ", subclass_of);
+  if (!base_class().empty()) {
+    f.write_h(": %s ", base_class().c_str());
+  }
   f.write_h("{\n");
 }
 
diff --git a/fluid/nodes/Function_Node.h b/fluid/nodes/Function_Node.h
index 282f33312..33bcc1849 100644
--- a/fluid/nodes/Function_Node.h
+++ b/fluid/nodes/Function_Node.h
@@ -271,9 +271,9 @@ public:
   typedef Node super;
   static Class_Node prototype;
 private:
-  const char* subclass_of;
-  char public_;
+  std::string base_class_;
   std::string prefix_;
+  char public_;
 public:
   Class_Node();
   ~Class_Node();
@@ -294,16 +294,20 @@ public:
   bool is_a(Type inType) const override { return (inType==Type::Class) ? true : super::is_a(inType); }
   void write_properties(fld::io::Project_Writer &f) override;
   void read_property(fld::io::Project_Reader &f, const char *) override;
-  const char* base_class_name() { return subclass_of; }
-  void base_class_name(const char* name) { storestring(name, subclass_of); }
+
+  /** Get base class access and name. */
+  std::string base_class() { return base_class_; }
+  /** Set base class access and name, i.e. `public Fl_Widget`. */
+  void base_class(const std::string& name) { storestring(name, base_class_); }
+
   char visibility() { return public_; }
   void visibility(char v) { public_ = v; }
 
   // class prefix attribute access
-  /** Set the text between `class` and the class name */
-  void prefix(const std::string& p) { prefix_ = p; }
   /** Get the text between `class` and the class name */
   std::string prefix() const { return prefix_; }
+  /** Set the text between `class` and the class name */
+  void prefix(const std::string& p) { prefix_ = p; }
 };
 
 #endif // FLUID_NODES_FUNCTION_NODE_H
diff --git a/fluid/nodes/Node.cxx b/fluid/nodes/Node.cxx
index 7557e61f4..a84528b59 100644
--- a/fluid/nodes/Node.cxx
+++ b/fluid/nodes/Node.cxx
@@ -455,6 +455,19 @@ int storestring(const char *n, const char * & p, int nostrip) {
   return 1;
 }
 
+// C++11 version, still using the original to copy all the side effects.
+int storestring(const std::string& n, std::string& p, int nostrip) {
+  const char *buffer { nullptr };
+  int ret = storestring(n.c_str(), buffer);
+  if (buffer) {
+    p = buffer;
+    free((void*)buffer);
+  } else {
+    p.clear();
+  }
+  return ret;
+}
+
 /** Update the `visible` flag for `p` and all its descendants.
  \param[in] p start here and update all descendants
  */
diff --git a/fluid/nodes/Node.h b/fluid/nodes/Node.h
index f6fce09b4..900addc6b 100644
--- a/fluid/nodes/Node.h
+++ b/fluid/nodes/Node.h
@@ -22,6 +22,8 @@
 #include <FL/Fl_Widget.H>
 #include <FL/fl_draw.H>
 
+#include <string>
+
 class Node;
 class Group_Node;
 class Window_Node;
@@ -113,6 +115,7 @@ enum class Type {
 void update_visibility_flag(Node *p);
 void delete_all(int selected_only=0);
 int storestring(const char *n, const char * & p, int nostrip=0);
+int storestring(const std::string& n, std::string& p, int nostrip=0);
 
 void select_all_cb(Fl_Widget *,void *);
 void select_none_cb(Fl_Widget *,void *);