accumulate variant

[mickey]

Hello,
could anyone explain me how do this below? I need to return the number of elements summed in way to do the mean. Is there anybody, please?

class Value {   
      public:
          double _value;
          bool _missed;
              bool getMissed() const { return _missed; }
              //other methods....
      };
      class Other {
          vector<Value> _values;
          static double sum_values(const double& accum, const Value& right) {
           if ( right.getMissed() ) return accum;
           return accum + right._value;
          }
          void computeMean() {
                double mean = std::accumulate( _values.begin(), _values.end(), 0.0,   
                Other::sum_values );
          }
      };

class Value {   
      public:
          double _value;
          bool _missed;
              bool getMissed() const { return _missed; }
              //other methods....
      };
      class Other {
          vector<Value> _values;
          static double sum_values(const double& accum, const Value& right) {
           if ( right.getMissed() ) return accum;
           return accum + right._value;
          }
          void computeMean() {
                double mean = std::accumulate( _values.begin(), _values.end(), 0.0,   
                Other::sum_values );
          }
      };

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