c++ -fpermissive error while implement callback in c++ - 


    class caller{ private:     callbackinterface &m_cb; public:     caller(callbackinterface& cb):m_cb(cb){};

doesn't give -fpermissive error whereas following gives. why so?

class caller{ private:     callbackinterface &m_cb; public:     caller(callbackinterface& cb){         m_cb=cb;     };

a reference variable should initialized when declaring. member variable constructed in constructor, should in initialization list .

if trying initialize member reference variable inside constructor, assignment variable should have been defined.

so code has issues in 2 fold

  1. reference variable not initialized when defined
  2. reference variable assigned once has been defined inside constructor.

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