아이템

class SubtitleItem
{
public:
    enum SUBTITLE_DIRECTION { LEFT, RIGHT };

    float time;
    SUBTITLE_DIRECTION direction;
    ofImage* image;

    static bool comp(const SubtitleItem *t1, const SubtitleItem *t2) { // 중요!
        return (t1->time < t2->time);
    }
};

활용

cout << "SORT TEST" << endl;
    cout << "=========== before =========" << endl;

    for (int i = 0; i < collection.size(); i++)
    {
        cout << collection[i]->time << endl;
    }

    
    //sort
    sort(collection.begin(), collection.end(), SubtitleItem::comp);


    cout << "============ after =========" << endl;
    for (int i = 0; i < collection.size(); i++)
    {
        cout << collection[i]->time << endl;
    }

결과