Passing member function into static function

See more:

C++

compiler

errors

Math.h

class Math
{
    public:
    static double integrate(double (*f)(double x), double a, double b);
};

Math.cpp

#include "Math.h"

double Math::integrate(double (*f)(double x), double a, double b)
{
    int m = 1000;
    double dt = (b-a)/m;
    double c = 0;

    for(int i = 0; i<m;>    {
        c += (*f)(a+i*dt);
    }

    return c/m;
}

Model.cpp

...
double Model::i_L_charging(double t)
{
    return V_in/(R_L+RDSON) - V_in/(R_L+RDSON)*exp(-t/tau_charging());
}

double Model::I_d_avg()
{
    return math.integrate(&i_L_charging, 0.0, T_charging()); //Error is here
}
...

The shortend error is (GNU GCC Compiler):

||In member function `double Model::I_d_avg()':|

|45|error: ISO C++ forbids taking the address of an unqualified or parenthesized non-static member function to form a pointer to member function. Say `&Model::i_L_charging'|

|45|error: no matching function for call to `Math::integrate(double (Model::*)(double), double, double)'|

|5|note: candidates are: static double Math::integrate(double (*)(double), double, double)|

||=== Build finished: 2 errors, 0 warnings ===|


Just as a test I put "sqrt" in as the function instead of "i_L_charging" and it works perfectly. What is going on here?

Your help is appreciated.

Regards,
Johnny