为什么我的枚举值在用作参数时“未定义”？

Question

A simplified model of my problem is below. All I'm trying to do is use the DegreeChecker() function in main(). The DegreeChecker() function takes an enum, 'DegreeProgram', as its type. This enum is defined in its own class, which subsequent classes inherit. But the problem is that the function in main() keeps treating any enum parameter as "undefined". Why is this happening and how can I resolve this?

#include <iostream>
using namespace std;

class Degree {
public:
    enum DegreeProgram { SECURITY, NETWORK, SOFTWARE };

};

class UseEnum : Degree {
public:
    bool DegreeChecker(DegreeProgram degreeProgram);
};

bool UseEnum::DegreeChecker(DegreeProgram degreeProgram) {

    if (degreeProgram == SOFTWARE) {
        return true;
    }

}



int main()
{
    UseEnum NewDegree;

    NewDegree.DegreeChecker(SOFTWARE); **//error: identifier "SOFTWARE" is undefined -- why?** 
    
    return 0;
}

Answer 1

The symbol is scoped to the Degree class so you will need to specify that in order to use it:

NewDegree.DegreeChecker(Degree::SOFTWARE);

Answer 2

The enum is a member of the Degree class, so it needs to be qualified.

Try

NewDegree.DegreeChecker(Degree::SOFTWARE);