C++, Can't instantiate abstract class error -

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the compiler gives error cannot instantiate abstract class due following members:

how sort this?

'double payoff::operator ()(const double &) const' : abstract

this abstract class

class payoff { public:     virtual ~payoff() {}     virtual double operator()(const double& spot) const = 0;     virtual std::shared_ptr<payoff> clone() const = 0; };

derived class 

class asiangeometric: public payoff{ private:         double strike; public:     asiangeometric(const double& strike);     virtual ~asiangeometric(){};     virtual double asianpay()(const std::vector<double>& spot_prices) const;     virtual std::shared_ptr<payoff> clone()const; };  asiangeometric::asiangeometric(const double& strike){     this-> strike = strike; }  double asiangeometric::asianpay(const std::vector<double>& spot_prices) const{     unsigned num_times = spot_prices.size();     double log_sum = 0.0;     (unsigned int i=0; i<spot_prices.size(); i++){         log_sum += log(spot_prices[i]);     }     double geom_mean = exp(log_sum/static_cast<double>(num_times));     if (geom_mean > strike) return geom_mean - strike;         else return 0;  }  std::shared_ptr<payoff> asiangeometric::clone()const{     return std::shared_ptr<payoff>(new asiangeometric(*this));  }

you aware that:

virtual double operator()(const std::vector<double>& spot_prices) const;

does not override:

virtual double operator()(const double& spot) const = 0;

right?


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