accumulate: variant

[mickey0]

hello,
I need to sum a vector and divide the sum by the number of element:
if the filed _missed is "true", the value mustn't take into account....

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 );
    }
};

My accumulate compute the sum properly but HOW can I retrive the numbers summed???

Thanks,

[weaknessforcats]

Maybe as you sum the Values you could push_back the Value into a vector that you could return.

BTW: Your sum_values is a re-code of the std::accumulate s algorithm.

[mickey0]

yes but there is this line too: "if ( right.getMissed () )"
I don't know how code your idea, because I don't usually use accumulate and alghorithms; could you write me an example, please?

thanks,

[weaknessforcats]

Read this: http://msdn.microsoft.com/en-us/library/3bsk3zs9.aspx.