Left of '.size' must have class/struct/union

Question

Still cannot get this one to work. Please help!

template <typename T>
class Container{
public:
    ...

    friend ostream& operator<<(ostream& ostr, const Container<T>& C)
    {
        for(size_t i=0; i!= data.size(); i++) // ERROR
            ostr<<data[i]<<" "; 
        return ostr;
    }

private:
    vector<T> data;
};

@OliCharlesworth data.size() throws: "left of '.size' must have class/struct/union" — user2696565, Aug 29 '13 at 18:22
@InnocentRetard, I can get the same error with `SomeClass *p; p.member();` — chris, Aug 29 '13 at 18:23
@InnocentRetard That's not MVP. MVP refers to the ambiguity between "function prototype" and "initialization of variable by constructor." — cdhowie, Aug 29 '13 at 18:23

score 4 · Accepted Answer · edited May 23 '17 at 11:57

4

data is a member of C and should therefore be accessed as C.data (remember that your operator<< is a free function and not a member of Container):

    for(size_t i = 0; i != C.data.size(); ++i)
        ostr << C.data[i] << " ";

edited May 23 '17 at 11:57

Community

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answered Aug 29 '13 at 18:22

NPE

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Left of '.size' must have class/struct/union

1 Answers1