Listing 3

#include <string>
#include "shape.h"

class PieDataItem{
public:
double value;
std::string label;
Shape appearance;
public:
PieDataItem(const double v,const std::string l,const int fill_col,
             const int fill_op=100,const int line_col=0x000000,
             const int line_sz=1,const int line_op=100):value(v),

label(l),appearance(line_sz,line_col,fill_col,line_op,fill_op){}
};
/** Functor for use by accumulate */
double get_value(double v,const PieDataItem &d){
return v+d.value;
}