Initialize a const vector in a class constructor (C++)

Question

I am trying to figure out how to initialize a const class member variable, (in this case a vector), to some arbitrary values in the class's constructor.

Basically, in the class definition, I have:

const vector < pair <float, float> > myVector;

In the class's constructor however, I would like to get the size of myVector to something arbitrary, and also populate it with arbitrary values. However, my compiler is saying that since it is a const, it cannot be changed, which makes sense, but I am unsure of how to then accomplish what I am trying to do here.

Answer 1

Assign it in an initializer list:

class MyClass {
public:
    MyClass()
    : myVector(createVector())
    { }

private:
    vector<pair<float,float>> createVector() {
        vector<pair<float,float>> v;
        // populate with whatever
        return v;
    }

    const vector<pair<float,float>> myVector;
};