How to use Global Functions correctly? (Undefined reference)

Symbiose

Hello, i´ve tried to write a program for different sort algorithm.

As soon as i tried to add a Function to Global im getting errors. Before the code worked fine. so the issue should be by one of the followings, but i dont know what causes the issue, but its always if the program try to open the (Ausgabe)Function in a Function:

frmmain.cpp

void Ausgabe(QVector<int> &ausgabe, QVector<int> &sort, QListWidget *lwSort, QListWidget *lwArray, int &anzahl, bool &sortierer);

void Ausgabe(QVector<int> &array, QVector<int> &sort, QListWidget *lwSort, QListWidget *lwArray, int &anzahl, bool &sortierer)
{
   if(sortierer == false)
   {
       for(int i=0; i <= anzahl-1; i++)
       {
          lwArray->addItem(QString::number(array[i]));
       }
   }
   else
   {
       for(int i=0; i <= anzahl-1; i++)
       {
          lwSort->addItem(QString::number(sort[i]));
       }
   }
   sortierer = false;
}

void FrmMain::on_btnBubble_clicked()
{
    sortierer = true;
    BubbleSortASC(sort, tempVector, anzahl);
    Ausgabe(array, sort, ui->lwSort, ui->lwArray, anzahl, sortierer);
}

frmmain.h

private slots:
    void on_btnArray_clicked();

    void on_cbSortiert_clicked();

    void on_cbOrderBy_clicked();

    void on_cbFirst_clicked();

    void Ausgabe(QVector<int> &array, QVector<int> &sort, QListWidget *lwSort, QListWidget *lwArray, int &anzahl, bool &sortierer);

    void on_btnBubble_clicked();

private:
    Ui::FrmMain *ui;
    bool asc = false;
    bool desc = false;
    bool first = false;
    bool sortierer = false;
    QVector<int> tempVector;
    QVector<int> array;
    QVector<int> sort;
    int anzahl;
};

Bonnie

You have a private slot member function with the same name ("Ausgabe") and the same parameters.
When you call Ausgabe in FrmMain::on_btnBubble_clicked, the compiler will try to call FrmMain::Ausgabe(...) which I think you probably have not implemented...
If I'm right, just delete the void Ausgabe(...) defined in frmmain.h.
Little tip: If you have both a global function and a class member function with the same name and parameters, and you want to call the global function inside the class, then you need to add ::, for example: ::Ausgabe(...)

jsulm

@Symbiose Why do you have void Ausgabe(...) also in private slots?! In this case you have to prefix it with FrmMain:: as it is a method of the class...

jsulm

@Symbiose Also please show the complete error message: what is undefined?

Bonnie

You have a private slot member function with the same name ("Ausgabe") and the same parameters.
When you call Ausgabe in FrmMain::on_btnBubble_clicked, the compiler will try to call FrmMain::Ausgabe(...) which I think you probably have not implemented...
If I'm right, just delete the void Ausgabe(...) defined in frmmain.h.
Little tip: If you have both a global function and a class member function with the same name and parameters, and you want to call the global function inside the class, then you need to add ::, for example: ::Ausgabe(...)

Symbiose

Thats it. I thought i would need to do that, but i only need to declare all Parameters Global. Thanks to everyone!

Solved How to use Global Functions correctly? (Undefined reference)