Better way to make the static functions not accessible with the derived classes

DRAMSys/library/src/common/jsonAddressDecoder.h

@@ -46,15 +46,13 @@ using std::pair;
 using std::map;
 
 class JSONAddressDecoder
-    : public AddressDecoder
+    : private AddressDecoder
 {
     // Friendship needed so that the AddressDecoder can access the
     // constructor of this class to create the object in CreateInstance.
     friend class AddressDecoder;
 
 private:
-    JSONAddressDecoder();
-
     vector<pair<unsigned, unsigned>>
                                   m_vXor;            // This container stores for each used xor gate a pair which consists of "First/Number of an address bit which corresponds to a bank"
     // and "Second/Number of an address bit which corresponds to a row"
@@ -65,10 +63,9 @@ private:
     vector<pair<unsigned, unsigned>>
                                   m_vColumnBits;     // This container stores for each column bit a pair which consists of "First/Number of the column bit" and "Second/Number of the address bit"
 
-    static AddressDecoder &getInstance();
-    static void createInstance(Type t);
-
 public:
+    JSONAddressDecoder();
+
     virtual void setConfiguration(std::string url);
 
     virtual DecodedAddress decodeAddress(sc_dt::uint64 addr);

DRAMSys/library/src/common/xmlAddressdecoder.h

@@ -45,24 +45,21 @@
 #include "AddressDecoder.h"
 
 class xmlAddressDecoder
-    : public AddressDecoder
+    : private AddressDecoder
 {
     // Friendship needed so that the AddressDecoder can access the
     // constructor of this class to create the object in CreateInstance.
     friend class AddressDecoder;
 
 private:
-    xmlAddressDecoder();
-
     std::map<std::string, sc_dt::uint64> masks;
     std::map<std::string, unsigned int> shifts;
 
     tinyxml2::XMLElement *addressmapping;
 
-    static AddressDecoder &getInstance();
-    static void createInstance(Type t);
-
 public:
+    xmlAddressDecoder();
+
     virtual DecodedAddress decodeAddress(sc_dt::uint64 addr);
     virtual sc_dt::uint64 encodeAddress(DecodedAddress n);