c++ - GSL 中的静态虚拟解决方法

Answer 1

I presume the void* in your function definition is a user-specified callback parameter. In that case, use this parameter to pass a pointer to your object and make your callback a static function. Inside this static function, cast this pointer back to the proper type (Experiment*) and call the non-static version of the function.

class Experiment
{
public:
    Experiment();
    ~Experiment();

    void setupExperiment();
    static int static_func(double t, const double y[], double f[], void *params);
    static int static_jac (double t, const double y[], double *dfdy, double dfdt[], void *params);
    virtual int func(double t, const double y[], double f[]);
    virtual int jac (double t, const double y[], double *dfdy, double dfdt[]);
};

void Experiment::setupExperiment()
{
    gsl_odeiv2_system sys = {static_func, static_jac, 2, this}; //Here is the problem with virtual functions
}

int Experiment::static_func(double t, const double y[], double f[], void *params)
{
  return ((Experiment*)params)->func(t, y, f);
}

int Experiment::static_jac (double t, const double y[], double *dfdy, double dfdt[], void *params)
{
  return ((Experiment*)params)->jac(t, y, dfdy, dfdt);
}

class aSpecificProblem: public Experiment
{
public:
    virtual int func(double t, const double y[], double f[]);
    virtual int jac (double t, const double y[], double *dfdy, double dfdt[]);
};