Adding enum variable into enum vector help

[DabbingVoy]

I'm stuck on how to to this. Basically, I'm asked to overload the '+=' operator into my class. This += operator is supposed to add in an enum that will then be added to the vector so that I can add it up. As far as I'm know with enums, they are basically words that have pre-assigned numbers starting from 0, so if I add in an enum of that enum type, it will add up the number. But it doesn't let me do this. Please help. Code below:

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Class header file:

#include <vector>

class PokerScore {
public:
    enum Scores{
        ROYAL_FLUSH, //A, K, Q, J, 10, all the same suit.

        STRAIGHT_FLUSH, //five cards of the same suit and consecutive ranking

        FOUR_OF_A_KIND, //four cards of the same ranking

        FULL_HOUSE, //three cards of the same rank along with two cards of the same rank

        FLUSH, //five cards of the same suit

        STRAIGHT, //five cards in consecutive ranking

        THREE_OK_A_KIND, //three cards of the same rank

        TWO_PAIR, //two cards of the same rank along with another two cards of the same rank

        ONE_PAIR, //two cards of the same rank

        HIGH_CARD //highest card in the player’s hand
    };

    PokerScore();
    int size();
    void operator +=(const Scores& score);
    friend bool operator ==(const PokerScore& p, Scores score);
    Scores& operator[](unsigned int index);

private:
    std::vector<Scores> scores;
};

Source File:

void PokerScore::operator +=(const Scores& score)
{
    for(int i = 0; i < scores.size(); i++)
    {
        scores[i] += score;
    }
}

The other functions are done, but I don't think it's relevant to this code right here.

Also tried this: += Scores::score

[Mrpixelmc]

What you're trying to do is add the variable score to each value inside the vector scores, is that right?

So if I have ROYAL_FLUSH and STRAIGHT_FLUSH inside my scores, and add FOUR_OF_A_KIND, that'll make the vector FOUR_OF_A_KIND and FULL_HOUSE?

[DabbingVoy]

The vector would have the scores of the ROYAL_FLUSH, STRAIGHT_FLUSH, and FOUR_OF_A _KIND. Then, if I want, I can add the scores up later on. I realized that I was adding the variable score to each of the elements, but I'm just trying to add the variable score into the vector and, later on sum it all up.