Operatrator [] as non-static function

Question

Code:

SchedulingItem operator[](Schedule obj,int el){
    return obj.OfVector().at(el);
}

Error:

academia::SchedulingItem academia::operator[](academia::Schedule, int)' must be a nonstatic member function
     SchedulingItem operator[](Schedule obj,int el)

Where is the problem?

operator [] must be a member function that takes one parameter, — , May 16 '17 at 19:50
Some dupe. Not even about the same freakin' operator. Plus the accepted answer is wrong. — Lightness Races in Orbit, May 16 '17 at 19:54
http://stackoverflow.com/questions/17210718/in-c-must-operator-be-a-member-function — , May 16 '17 at 19:57

score 5 · Answer 1 · answered May 16 '17 at 19:51

5

The problem is that, just as the message says, this function must be a non-static member function.

That's simply a law of C++, for operator[].

You've instead made it a non-member, or "free" function.

answered May 16 '17 at 19:51

Lightness Races in Orbit

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Looking forward to hearing about the mistake in this answer. – Lightness Races in Orbit May 16 '17 at 19:52
Apparently it's rude to expect people to actually read the error message telling them exactly what the problem is and how to fix it – M.M May 16 '17 at 21:43
@M.M: It's a strange world we live in – Lightness Races in Orbit May 16 '17 at 21:44

score 1 · Answer 2 · answered May 16 '17 at 20:18

operator[] must be a non-static member of your Schedule class, eg:

class Schedule
{
private:
    std::vector<SchedulingItem> m_vec;
public:
    SchedulingItem& operator[](int el);
};

SchedulingItem& Schedule::operator[](int el)
{
    return m_vec.at(el);
}

Operatrator [] as non-static function

2 Answers2

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