class FuncSource {
protected:
	Function <double(double)> function;

public:
	FuncSource(Function <double(double)> function) : function(function) {}
	double f(double x)	{return function(x);}
};

class MySource : public FuncSource {
public:
	MySource(double data) : FuncSource(&Calc), data(data) {}  // COMPILER ERROR
	
	double Calc(double x) {return x + data/10;}
	
private:
	double data;
};