Comparison operator is uncertain

Asked May 05 '17 at 18:11

Active May 05 '17 at 18:20

Viewed 29 times

i've overloaded some comparison operators in my Student class. When i try to use them, the result is uncertain:

class Student {
public:
    int ID;
    int grade;
    int teamID;
    int power;
    Student(int id,int grade, int power): ID(id),
        grade(grade),teamID(-1),power(power){};
    ~Student() {};
bool operator==(Student* right) {
    return this->ID == right->ID;
}
bool operator<(Student* right) {
    return this->ID < right->ID;
}

bool operator>(Student* right) {
    return this->ID > right->ID;
}


};

And this is where the weird things happen:

for (int i = 0; i < 10; i++) {
        Student* s1 = new Student(i + 1, i + 1, i + 1);
        Student* s2 = new Student(i + 2, i + 1, i + 1);
        cout << (s1 < s2);  
    }

The result is always some permutation of zeros and ones, nothing stable. I have no idea why this might happen. Can anyone help me? The reason why i'm using pointers is that i use a pointer to Student as a type T for another template class.

asked May 05 '17 at 18:11

CodeHoarder

2

You're just comparing pointers. For your operators two be called, one of the students needs to not be a pointer. – Ben Steffan May 05 '17 at 18:13
2

Please see this for all our operator overloading needs: http://stackoverflow.com/questions/4421706/operator-overloading – NathanOliver May 05 '17 at 18:19
Thanks guys, it really helped :) – CodeHoarder May 06 '17 at 09:51

Comparison operator is uncertain

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