gistfile1.cpp

typedef callback_t .....; // callback function

int run_export(int numX, int numU, callback_t * ode, callback_t * ref, .........){
  
    vector<DifferentialState> xvec;
    vector<Control> uvec;

    for (int k=0; k<numX; k++){
        DifferentialState x;
        xvec.push_back(x);
    }
    for (int k=0; k<numU; k++){
        Control u;
        uvec.push_back(u);
    }

    DifferentialEquation f = ode(xvec, uvec);
    Function r = ref(xvec, uvec);
}