Question

我有一个成员函数“ myfunction”和“ my约束1”，如下所示。

//f= k1(x1-a1)^2 + k2(x2-a2)^2 + k3(x3-a3)^2
double CNonlinearOptimization::myfunction(unsigned n, const double *x, double *grad, void *pdata) {

    if (grad) {
        grad[0] = 2*k1*(x[0]-1);
        grad[1] = 2*k2*(x[1]-3);
        grad[2] = 2*k3*(x[2]-5);
    }

    return (k1*(x[0]-1)*(x[0]-1)+k2*(x[1]-3)*(x[1]-3)+k3*(x[2]-5)*(x[2]-5));
}

double CNonlinearOptimization::myconstraint1(unsigned n, const double *x, double *grad, void *data){

    ++count;

    if (grad) {
        grad[0] = -1;       //grad[0] = d(c1)/dx1
        grad[1] = 0;        //grad[1] = d(c1)/dx2
        grad[2] = 0;        //grad[2] = d(c1)/dx3
    }
    return (0.9-(x[0]-2));
}

i将通过在主函数中应用nlopt来调用其函数，如下所示。 nlopt_set_min_objective(opt,nonlinopt.myfunction, NULL); nlopt_add_inequality_constraint(opt,nonlinopt.myconstraint1, NULL, 1e-8);

我试图做一个指针：

CNonlinearOptimization nonlinopt;
nlopt_set_min_objective(opt,nonlinopt.myfunction, NULL);

但是，我遇到了一些错误：

NonlinearOptimization.cpp(288): error C3867: 'CNonlinearOptimization::myfunction': function call missing argument list; use '&CNonlinearOptimization::myfunction' to create a pointer to member
NonlinearOptimization.cpp(290): error C3867: 'CNonlinearOptimization::myconstraint1': function call missing argument list; use '&CNonlinearOptimization::myconstraint1' to create a pointer to member

有人知道如何解决吗？

Answer 1

如错误消息所述，您应该使用

&objectName.memberFunctionName

语法以获得指向成员函数的指针。请注意&。尝试通过这种方式传递

nlopt_set_min_objective(opt, &nonlinopt.myfunction, NULL);

如何制作一个指针来调用我的成员函数？

1 个答案: