overloading operator. Const arguments make some problems

Question

class Vector{
......
.......
private:
int dim;
public:
int getDim() {
return this->dim;


}
const Vector operator+(const  Vector& right){
this->getSize();
}
 };

And I got compile error in this->getSize();. It is caused fact, that argument right is const. I don't know where is problem. I don't try modify right.

juanchopanza · Accepted Answer · 2014-04-12 09:48:56Z

3

Presumably you have a non-const method Vector::getSize(). You need to make it const so that it can be called on const objects or via const references or pointers to const. For example:

int getSize() const;
              ^^^^^

Also note that it doesn't make much sense to return a const value (and would inhibit move semantics if you had them). The canonical form of an addition member operator would be

// const method: A = B + C should not modify B
Vector operator+(const Vector& right) const;
                                      ^^^^^

and the non-member

Vector operator+(const Vector& left, const Vector& right);

answered Apr 12, 2014 at 9:48

juanchopanza

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