c++ - need design help using private inheritance -


i have problem following situation: library (cardreader) implements iso7816 protocol , communicates smart card (implemented me).

i have implement proprietary protocol use library.

in cardreader there following classes apdurequest , apduresponse. , cardreader class implements functions send , receive these messages.

class apduresonse { public:        /* ctor, copy ctor, move ctor, copy =, , move = operators. */     //...     int statusword() const { return ...; }     int sw1() const { return ...; }     int sw2() const { return ...; }    };

on other hand in software have hierarchy independent implentare messages , smart card. interface of base class:

enum class messagereskind { /* ... */ };  class imessageres { public:     virtual ~imessageres() {};     virtual int statusword() const = 0;     virtual int sw1() const = 0;     virtual int sw2() const = 0;     virtual messagereskind kind() const = 0;            virtual void print( std::ostream& ) = 0; };

now doubt how derive specialized class... first attempt was:

class admessageresatr : public iadmessageres, private iso7816::apduresponse { public:      // import iso7816::apduresponse ctor     using iso7816::apduresponse::apduresponse;      using iso7816::apduresponse::sw1;     using iso7816::apduresponse::sw2;     using iso7816::apduresponse::statusword;      admessagereskind kind() const     {         return admessagereskind::atr;     }      void print() const {} };

but i've compile time error: unable instantiate abstract class admessageresatr: statusword, sw1 , sw2 abstract

not sure trying achieve if want expose interface , use library implementation, can this:

class admessageresatr : public iadmessageres, private iso7816::apduresponse { public:      int sw1() const {return iso7816::apduresponse::sw1();} ... };

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