Calling quadl from a class

[Bogdan Cristea]

Is there a way to call quad from a class using a function which is a member of that class?

Minimal example:

class Example
{
double fct_to_int(const double x);
double integrate(double a, double b);
};

double integrate(double a, double b)
{
return quad(fct_to_int, a, b);
}

[Bogdan Cristea]

I reply to myself: pointers to functions and to member functions are incompatible.
Possible solution: define a templated version of this function to use pointers to member function.
Is this possible?