Hi,

I created a simple class that should provide Indexnumbers for a Node-Editor.

indexhandler.h:
Qt Code: 
  1. #ifndef INDEXHANDLER_H
  2. #define INDEXHANDLER_H
  3.  
  4. enum type {NODE=0 ,PIN=1 , WIRE=2};
  5.  
  6. class Indexhandler
  7. {
  8. public:
  9.     Indexhandler();
  10.  
  11.     int getNodeindex() const;
  12.     void setNodeindex(int value);
  13.  
  14.     int getPinindex() const;
  15.     void setPinindex(int value);
  16.  
  17.     int getWireindex() const;
  18.     void setWireindex(int value);
  19.  
  20.     int requestIndex(int type);
  21.  
  22. private:
  23.    int nodeindex;
  24.    int pinindex;
  25.    int wireindex;
  26. };
  27.  
  28. #endif // INDEXHANDLER_H
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indexhandler.cpp:
Qt Code: 
  1. #include "indexhandler.h"
  2.  
  3. Indexhandler::Indexhandler()
  4. {
  5.     setPinindex(0);
  6.     setNodeindex(0);
  7.     setWireindex(0);
  8. }
  9.  
  10. int Indexhandler::getNodeindex() const
  11. {
  12.     return nodeindex;
  13. }
  14.  
  15. void Indexhandler::setNodeindex(int value)
  16. {
  17.     nodeindex = value;
  18. }
  19. int Indexhandler::getPinindex() const
  20. {
  21.     return pinindex;
  22. }
  23.  
  24. void Indexhandler::setPinindex(int value)
  25. {
  26.     pinindex = value;
  27. }
  28. int Indexhandler::getWireindex() const
  29. {
  30.     return wireindex;
  31. }
  32.  
  33. void Indexhandler::setWireindex(int value)
  34. {
  35.     wireindex = value;
  36. }
  37.  
  38. int Indexhandler::requestIndex(int type)
  39. {
  40.       switch(type)
  41.       {
  42.             case PIN: return getPinindex();
  43.             case NODE: return getNodeindex();
  44.             case WIRE: return getWireindex();
  45.             default: return -1;
  46.       }
  47.  
  48. }
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I instantiate it in the MainWindows constructor like this:
Qt Code: 
  1. #include "mainwindow.h"
  2. #include "ui_mainwindow.h"
  3. #include <QDebug>
  4.  
  5. MainWindow::MainWindow(QWidget *parent) :
  6.     QMainWindow(parent),
  7.     ui(new Ui::MainWindow)
  8. {
  9.     ui->setupUi(this);
  10.  
  11.     Indexhandler *indexhandler = new Indexhandler;
  12.  
  13.     qDebug() << indexhandler->getNodeindex();
  14. }
  15.  
  16. MainWindow::~MainWindow()
  17. {
  18.     delete ui;
  19. }
  20.  
  21. void MainWindow::on_pushButton_clicked()
  22. {
  23.     qDebug() << indexhandler->getNodeindex();
  24. }
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The first qDebug() prints out 0 as expected,
but the second one (after the pushButton_clicked() returns a random number. Since this number only changes if the Program is restart it looks like a Stray Pointer to me.
What am I doing wrong?