Hi again,
I have encountered an odd obstacle.
I implement MVC pattern using subclassed QTreeView as myView and QAbstractItemModel as myModel. I place the myView object in MyMVC that contains combo box and line edit, which are used as filter input. Anyway, everything works perfect with the whole application.

But when I add a few (commented below in mymvc.cpp) lines I get Core Dumped and the main window of my program just shows for a while and dissapears.

Above the backtrace I receive:
*** glibc detected *** ./PL09: corrupted double-linked list: 0x08124aa8 ***
(PL09 is a name of a application file)

Here is the code of mymvc.h
Qt Code: 
  1. #ifndef MTR_SAFETY_DECLARATION_FOR_MYMVC_H
  2. #define MTR_SAFETY_DECLARATION_FOR_MYMVC_H
  3. #include <QWidget>
  4. namespace MTR {
  5. class Book;
  6. class SBook;
  7. }
  8. class myView;
  9. class myModel;
  11. class QLabel;
  12. class QComboBox;
  13. class QLineEdit;
  15.  
  16. class MyMVC : public QWidget {
  17. 	Q_OBJECT
  18. public:
  19. 	MyMVC(QList<MTR::Book>* list = 0, QWidget* parent = 0);
  20. 	void prodModel(QList<MTR::Book>*);
  21. public slots:
  22. 	bool getCaseSensitive(void) { return caseSensitive; }
  23. 	void setCaseSensitive(bool cs) { caseSensitive = cs; }
  24. signals:
  25. 	void doubleClickInTreeView(int);
  26. private:
  27. 	QList<MTR::SBook>* slist;
  28. 	QLineEdit* le;
  29. 	QComboBox* qcb;
  30. 	myModel* model;
  31. 	myView* qtv;
  33. 	QLabel* label;
  34. 	bool caseSensitive;
  35.         QRadioButton* radioOne;
  36. 	QRadioButton* radioTwo;
  37. };
  38.  
  39. #endif
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Then you have mymvc.cpp
Qt Code: 
  1. #include "mymvc.h"
  2. #include "myView.h"
  3. #include "sbook.h"
  4. #include "myModel.h"
  5. #include "myHeaderView.h"
  6. #include <QList>
  7. #include <QGridLayout>
  8. #include <QLabel>
  9. #include <QLineEdit>
  10. #include <QComboBox>
  11. #include <QRadioButton>
  12.  
  13. MyMVC::MyMVC(QList<MTR::Book>* list, QWidget* parent) {
  14. 	slist = new QList<MTR::SBook>();
  15. 	for(int i = 0;i<list->size();++i) {
  16. 		slist->append(MTR::SBook(i,list->value(i)));
  17. 	}
  18.    setFixedSize(590,400);
  19.  
  20.    le = new QLineEdit();
  21.    qcb = new QComboBox();
  22.    qcb->addItem(tr("filter by Title"));
  23.    qcb->addItem(tr("filter by Author"));
  24.    qcb->addItem(tr("filter by Publisher"));
  25.    qcb->setCurrentIndex(0);
  26.  
  27.    model = new myModel(*slist,le,qcb);
  28. 	model->filter();
  29.  
  30.    qtv = new myView(model);
  31. 	qtv->header()->setSortIndicator(0,Qt::DescendingOrder);
  32.  
  33.    label = new QLabel(tr("Enter a character string below"));
  34.    //radioOne = new QRadioButton(tr("Case Sensitive - TRUE"));
  35.    //radioTwo = new QRadioButton(tr("Case Sensitive - FALSE"));
  36. 	//radioOne->setChecked(true);
  37. 	caseSensitive = true;
  38.    qvb = new QGridLayout();
  39. 	//connect(radioOne,SIGNAL(toggled(bool)),this,SLOT(setCaseSensitive(bool)));
  40.    connect(qcb,SIGNAL(currentIndexChanged(int)),le,SLOT(clear()));
  41.    connect(qcb,SIGNAL(currentIndexChanged(int)),qtv,SLOT(filter()));
  42.    connect(le,SIGNAL(textChanged(const QString &)),qtv,SLOT(filter()));
  43.    connect(model,SIGNAL(fromTVtoVM(int)),this,SIGNAL(doubleClickInTreeView(int)));
  44.  
  45.    qvb->addWidget(label,0,0);
  46.    //qvb->addWidget(radioOne,0,1);
  47.    qvb->addWidget(le,1,0);
  48.    //qvb->addWidget(radioTwo,1,1);
  49.    qvb->addWidget(qcb,2,0,1,2);
  50.    qvb->addWidget(qtv,3,0,1,2);
  51.    setLayout(qvb);
  52. }
  53.  
  54. void MyMVC::prodModel(QList<MTR::Book>* list) {
  55. 	slist->clear();
  56. 	for(int i = 0;i<list->size();++i) {
  57. 		slist->append(MTR::SBook(i,list->value(i)));
  58. 	}
  59. 	model->setInternalList(*slist);
  60.    qcb->setCurrentIndex(0);
  61. 	qtv->filter();
  62.  
  63. }
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So my question is simple: what is going on... ?