How to link Combo Box elements in Qt with predefined elements in static vector with same index?

I have 20 elements stored in vector, what I want to do is that : when user selects one element from drop down list (Combo Box) the Value of Source or Destination of My Navigation (Routing) gets the unsigned int value with same index of element on Combo Box from the vector, how can I do That with Combo Box on Qt ?

//Start
void MainWindow::fill_MyPlaces(){
    MyPlaces.push_back(make_pair("Aldi Store",1545694404)); //1 Aldi
    MyPlaces.push_back(make_pair("Restaurant Le Fut",1544558413)); //2 Restaurant Le Fut
    MyPlaces.push_back(make_pair("Place Schnider",1455348628)); //3 place schnider
    MyPlaces.push_back(make_pair("Acacias Residence",1540689869)); //4 Acacias
    MyPlaces.push_back(make_pair("IUT University",442028765));  //5 IUT
    MyPlaces.push_back(make_pair("Train Station (Gare du Creusot)",1387416514)); //6 Train Station (Gare du Creusot)
    MyPlaces.push_back(make_pair("Carrefour Shopping Center",1829507841)); //7 Carrefour
    MyPlaces.push_back(make_pair("Condorcet Center University",2019043458)); //8 Condorcet
    MyPlaces.push_back(make_pair("Hospital Creusot",2258325836)); //9 Hospital Creusot
    MyPlaces.push_back(make_pair("BNP PariBank",1544079469)); //10 BNP PariBank
    MyPlaces.push_back(make_pair("Acion Store",889114982)); //11 Action Store
    MyPlaces.push_back(make_pair("El-Loco Cafe",1540689876));//12 El-Loco Cafe
    MyPlaces.push_back(make_pair("Residence Jean Monnent",2244694498));//13 Residence Jean Monnent
    MyPlaces.push_back(make_pair("Crous Office & Restaurant",1540680545));//14 Crous Office & Restaurant
    MyPlaces.push_back(make_pair("Euro Lav(Laundry)",4846313478));//15 Euro Lav(Laundry)
    MyPlaces.push_back(make_pair("Pharmacie des Acacias",1540689863));//16 Pharmacie des Acacias
    MyPlaces.push_back(make_pair("Centre Medico Scolaire (Medical school)",1544558417));//17 centre medico scolaire (Medical school)
    MyPlaces.push_back(make_pair("Driving School",1544558167));//18 Driving School
    MyPlaces.push_back(make_pair("Le Poste",2019027442));//19 Le Poste
    MyPlaces.push_back(make_pair("MCDonld's",6269205284));//20 McDonald's
}
//End

Solution

QComboBox allows you to store additional information through the roles that can be accessed through itemData():

#include <QtWidgets>

class Widget: public QWidget{
    Q_OBJECT
public:
    Widget(QWidget *parent=nullptr): 
        QWidget(parent), combo(new QComboBox), label(new QLabel)
    {
        QVBoxLayout *lay = new QVBoxLayout{this};
        lay->addWidget(combo);
        lay->addWidget(label);
        connect(combo, 
            QOverload<int>::of(&QComboBox::currentIndexChanged), 
            this, 
            &Widget::onCurrentIndexChanged);

        for(const std::pair<QString, int> & p: std::vector<std::pair<QString, int>>{
            {"Aldi Store", 1545694404}, //1 Aldi
            {"Restaurant Le Fut",1544558413}, //2 Restaurant Le Fut
            {"Place Schnider",1455348628}, //3 place schnider
            {"Acacias Residence",1540689869}, //4 Acacias
            {"IUT University",442028765},  //5 IUT
            {"Train Station (Gare du Creusot)",1387416514}, //6 Train Station (Gare du Creusot)
            {"Carrefour Shopping Center",1829507841}, //7 Carrefour
            {"Condorcet Center University",2019043458}, //8 Condorcet
            {"Hospital Creusot",2258325836}, //9 Hospital Creusot
            {"BNP PariBank",1544079469}, //10 BNP PariBank
            {"Acion Store",889114982}, //11 Action Store
            {"El-Loco Cafe",1540689876},//12 El-Loco Cafe
            {"Residence Jean Monnent",2244694498},//13 Residence Jean Monnent
            {"Crous Office & Restaurant",1540680545},//14 Crous Office & Restaurant
            {"Euro Lav(Laundry)",4846313478},//15 Euro Lav(Laundry)
            {"Pharmacie des Acacias",1540689863},//16 Pharmacie des Acacias
            {"Centre Medico Scolaire (Medical school)",1544558417},//17 centre medico scolaire (Medical school)
            {"Driving School",1544558167},//18 Driving School
            {"Le Poste",2019027442},//19 Le Poste
            {"MCDonld's",6269205284},//20 McDonald's
        }){
            combo->addItem(p.first, p.second);
        }
    }
public slots:
    void onCurrentIndexChanged(int index){
        int value = combo->itemData(index).value<int>();
        label->setNum(value);
    }
private:
    QComboBox *combo;
    QLabel *label;
};


int main(int argc, char *argv[]) {
    QApplication app(argc, argv);
    Widget w;
    w.show();
    return app.exec();
}

#include "main.moc"