1) implemented noDefaultMethods. See effective C++ Item 6. There it is called Uncopyable

2) implemented Lock. See effective C++ item 14.
     This is as easy to use as Java synchronize.
3) wrapper on top of std::string. All usage of string in pvData is one of:
      String - Just a std::string
     StringBuilder - Used where StringBuilder is used in Java
     StringConst - Just a "std::string const". This is used wherever String is used in Java
     StringConstArray - Just like a String[] in Java.
4) The reference counting (incReferenceCount and decReferenceCount) are now private. It is completely handled by the implenentaion.
    NO code that uses pvData needs even know about reference counting.

pvDataApp/factory/BasePVDoubleArray.h

@@ -30,11 +30,10 @@ namespace epics { namespace pvData {
        virtual void deserialize(ByteBuffer *pbuffer,DeserializableControl *pflusher);
        virtual void serialize(ByteBuffer *pbuffer,
             SerializableControl *pflusher, int offset, int count) const;
-       virtual void toString(StringPtr buf)const;
-       virtual void toString(StringPtr buf,int indentLevel)const;
+       virtual void toString(StringBuilder buf)const;
+       virtual void toString(StringBuilder buf,int indentLevel)const;
     private:
-        BasePVDoubleArray(); // not implemented
-        DoubleArrayPtr doubleArray;
+        double *doubleArray;
     };
 
     BasePVDoubleArray::BasePVDoubleArray(PVStructure *parent,
@@ -88,12 +87,12 @@ namespace epics { namespace pvData {
         throw std::logic_error(notImplemented);
     }
 
-    void BasePVDoubleArray::toString(StringPtr buf)const
+    void BasePVDoubleArray::toString(StringBuilder buf)const
     {
         toString(buf,1);
     }
 
-    void BasePVDoubleArray::toString(StringPtr buf,int indentLevel)const
+    void BasePVDoubleArray::toString(StringBuilder buf,int indentLevel)const
     {
         convert->getString(buf,this,indentLevel);
         PVArray::toString(buf,indentLevel);