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Forum Update on Monday, May 27th 2025

Can't find the invalid pointer

Scheduled Pinned Locked Moved Unsolved General and Desktop
invalid pointerqt5.15.0crash app
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  • nageshN Offline
    nageshN Offline
    nagesh
    wrote on last edited by nagesh
    #4
    void Face::__init_layout() {
    ....
    layout->addWidget(&facelets[i][j], i, j);
    }
    

    You have added the facelets objects to the layout.
    The ownership of item is transferred to the layout, and it's the layout's responsibility to delete it.
    I feel no need to free the memory in the destructor for the facelets and as well as layout.

    Refer object tree & ownership details
    https://doc.qt.io/qt-5/objecttrees.html

    G 1 Reply Last reply
    3
    • nageshN nagesh
      void Face::__init_layout() {
      ....
      layout->addWidget(&facelets[i][j], i, j);
      }
      

      You have added the facelets objects to the layout.
      The ownership of item is transferred to the layout, and it's the layout's responsibility to delete it.
      I feel no need to free the memory in the destructor for the facelets and as well as layout.

      Refer object tree & ownership details
      https://doc.qt.io/qt-5/objecttrees.html

      G Offline
      G Offline
      Gallo Magico
      wrote on last edited by Gallo Magico
      #5

      @nagesh I still get error but is a different message

      The inferior stopped because it received a signal from the operating system.
      
      Signal name : 
      SIGABRT
      Signal meaning : 
      Aborted
      

      I get this error in Facelet::~Facelet() and the console application displays munmap_chunk(): invalid pointer.
      I also tried to turn facelets into a Facelet*** and treat Facelet[i][j] as a pointer instead as an object, but I get the same error I got at the begin

      1 Reply Last reply
      0
      • nageshN Offline
        nageshN Offline
        nagesh
        wrote on last edited by
        #6

        @Gallo-Magico do you still get these errors when you are not deleting/freeing?

        //__delete_facelets();
            //delete layout;
        
        G 1 Reply Last reply
        0
        • nageshN nagesh

          @Gallo-Magico do you still get these errors when you are not deleting/freeing?

          //__delete_facelets();
              //delete layout;
          
          G Offline
          G Offline
          Gallo Magico
          wrote on last edited by
          #7

          @nagesh yes

          1 Reply Last reply
          0
          • G Gallo Magico

            I'm working with qt5.15 in qtCreator in ubuntu 20.04 and g++. My program compiles and works fine until I close the main window becuase I get the error in the title of the question. I read that this error occurs when there is a invalid pointer, I tried to find it in my program but I couldnt.

            main.cpp

            #include "MainWindow.h"
            
            #include <QApplication>
            
                int main(int argc, char *argv[])
                {
                    QApplication a(argc, argv);
                    MainWindow w;
                    w.show();
                    return a.exec();
                }
            

            MainWindow.h

            #pragma once
            
            #include "Facelet.h"
            #include "Face.h"
            
            #include <QMainWindow>
            #include <QWidget>
            #include <QSpacerItem>
            
            class MainWindow : public QMainWindow
            {
                Q_OBJECT
            
                using type = Face;
            
            public:
                MainWindow(QWidget *parent = nullptr);
                ~MainWindow();
            
            protected:
            
                virtual void resizeEvent(QResizeEvent*) override;
            
            private:
            
                void __init_spacers();
            
                QWidget* wid;
                type* object;
                QGridLayout* layout;
                QSpacerItem* spacer;
            
            };
            

            MainWindow.cpp

            #include "MainWindow.h"
            
            MainWindow::MainWindow(QWidget *parent)
                : QMainWindow(parent)
            {
                object = new type();
                layout = new QGridLayout();
                wid = new QWidget();
                __init_spacers();
                layout->setContentsMargins(0,0,0,0);
                layout->addWidget(object, 1, 1);
                wid->setLayout(layout);
                setCentralWidget(wid);
            }
            
            MainWindow::~MainWindow()
            {
                delete spacer;
                delete object;
                delete layout;
                delete wid;
            }
            
            //protected
            
            void MainWindow::resizeEvent(QResizeEvent*) {
                int side = (size().width() < size().height()) ? size().width() : size().height();
                object->resize(side, side);
            }
            
            //private
            
            void MainWindow::__init_spacers() {
                spacer = new QSpacerItem(0,0, QSizePolicy::Expanding, QSizePolicy::Expanding);
                layout->addItem(spacer, 0, 1);//top
                layout->addItem(spacer, 1, 0);//left
                layout->addItem(spacer, 2, 1);//bootom
                layout->addItem(spacer, 1, 2);//right
            }
            

            Face.h

            #pragma once
            
            #include "Facelet.h"
            #include <QGridLayout>
            
            class Face : public QWidget {
            
                Q_OBJECT
            
            public:
            
                explicit Face(QWidget* parent = nullptr);
                ~Face();
            
                std::string get_pattern();
            
            protected:
            
                virtual void resizeEvent(QResizeEvent *event = nullptr) override;
            
            private:
            
                void __init_widget();
                void __init_layout();
                void __init_facelets();
                void __update_facelets(int side);
                void __delete_facelets();
            
                Facelet** facelets;
                QGridLayout* layout;
            
                constexpr static unsigned int SIDE = 248;
                constexpr static unsigned int SPACE = 10;
            
            };
            

            Face.cpp

            #include "Face.h"
            
            Face::Face(QWidget* parent) : QWidget(parent) {
                __init_facelets();
                __update_facelets(75);
                __init_layout();
                __init_widget();
            }
            
            Face::~Face() {
                __delete_facelets();
                delete layout;
            }
            
            std::string Face::get_pattern() {
                std::string result;
                for(int i = 0; i < 3; ++i) {
                    for(int j = 0; j < 3; ++j) {
                        result.push_back( char(Colors::list[facelets[i][j].id()].second) );
                    }
                }
                return result;
            }
            
            //protected
            
            void Face::resizeEvent(QResizeEvent *event) {
                int side = (size().width() > size().height()) ? size().width() : size().height();
                int facelet_side = (side-8)/3;
                __update_facelets(facelet_side);
            }
            
            //private
            
            void Face::__init_widget() {
                this->resize(SIDE, SIDE);
                this->setMinimumSize(SIDE, SIDE);
                this->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
                this->setAttribute(Qt::WA_StyledBackground);
                this->setStyleSheet("background-color: black;");
                this->setLayout(layout);
            }
            
            void Face::__init_layout() {
                layout = new QGridLayout();
                layout->setSpacing(2);
                layout->setContentsMargins(2, 2, 2, 2);
                for(int i = 0; i < 3; ++i) {
                    for(int j = 0; j < 3; ++j) {
                        layout->addWidget(&facelets[i][j], i, j);
                    }
                }
            }
            
            void Face::__init_facelets() {
                facelets = new Facelet*[3];
                for(int i = 0; i < 3; ++i) {
                    facelets[i] = new Facelet[3];
                }
            }
            
            void Face::__update_facelets(int side) {
                for(int i = 0; i < 3;++ i) {
                    for(int j = 0; j < 3; ++j) {
                        facelets[i][j].setFixedSize(side, side);
                    }
                }
            }
            
            void Face::__delete_facelets() {
                for(int i = 0; i < 3; ++i) {
                    delete[] facelets[i];
                }
                delete[] facelets;
            }
            

            Facelette.h

            #pragma once
            
            #include "Colors.h"
            
            #include <QPushButton>
            #include <QPainter>
            
            class Facelet : public QPushButton {
            
                Q_OBJECT
            
            public:
            
                using id_type = Colors::Id;
            
                explicit Facelet(QWidget* parent = nullptr);
                explicit Facelet(Colors::Id color, QWidget* parent = nullptr);
                virtual ~Facelet();
            
                void reset();
                void set_color(Colors::Id);
                id_type id();
            
            protected:
                virtual void paintEvent(QPaintEvent *e = nullptr) override;
            
            public slots:
            
                void __change_color();
            
            private:
                
                int _Id;
            
            };
            

            Facelet.cpp

            #include "Facelet.h"
            #include <QStyleOption>
            
            Facelet::Facelet(QWidget* parent) : QPushButton(parent) {
                reset();
                connect(this, SIGNAL(clicked()), SLOT(__change_color()));
            }
            
            Facelet::Facelet(Colors::Id id_, QWidget* parent) : QPushButton(parent) {
                set_color(id_);
                connect(this, SIGNAL(clicked()), SLOT(__change_color()));
            }
            
            Facelet::~Facelet() {}
            
            void Facelet::reset() {
                _Id = -1;
                this->setStyleSheet("background-color:lightGray;");
            }
            
            void Facelet::set_color(Colors::Id _id) {
                _Id = _id;
                setStyleSheet(QString("background-color:")+Colors::list[_Id].first+";");
            }
            
            Facelet::id_type Facelet::id() {
                return Facelet::id_type(_Id);
            }
            
            //protected
            
            void Facelet::paintEvent(QPaintEvent *) {
                QStyleOption opt;
                opt.init(this);
                QPainter p(this);
                style()->drawPrimitive(QStyle::PE_Widget, &opt, &p, this);
            }
            
            //private slots
            
            void Facelet::__change_color() {
                _Id = (_Id >= 5) ? 0 : (_Id+1);
                set_color(Colors::Id(_Id));
            }
            

            Colors.h

            #pragma once
            
            #include "Rubix/Rubix.h"
            
            #include <array>
            #include <utility>
            #include <QColor>
            
            
            struct Colors {
            
                using value_type = typename std::pair<QString, rbx::RColor>;
                using array_type = typename std::array<value_type, 6>;
                enum Id { Yellow, Red, Green, Orange, Blue, White };
                static array_type list;
            
            };
            

            Colors.cpp

            #include "Colors.h"
            
            Colors::array_type Colors::list = {
                Colors::value_type("yellow", rbx::YELLOW),
                Colors::value_type("rgb(255, 20, 20)", rbx::RED),
                Colors::value_type("rgb(35, 255, 35)", rbx::GREEN),
                Colors::value_type("rgb(255, 130, 20)", rbx::ORANGE),
                Colors::value_type("blue", rbx::BLUE),
                Colors::value_type("white", rbx::WHITE),
            };
            

            when I close the window I get the following error

            21:07:22: Starting /home/kubuntu/Desktop/projects/x64/RubbixSolver/Debug/GUI/build-GUI-Desktop_Qt_5_15_2_GCC_64bit-Profile/GUI ...
            21:07:46: The program has unexpectedly finished.
            21:07:46: The process was ended forcefully.
            21:07:46: /home/kubuntu/Desktop/projects/x64/RubbixSolver/Debug/GUI/build-GUI-Desktop_Qt_5_15_2_GCC_64bit-Profile/GUI crashed.
            

            If I start the debug when I close the main window it says there is a problem in Face::~Face(), a small message-window pops up with the following message'The inferior stopped because it received a signal from the operating system. Signal name : SIGSEGV Signal meaning : Segmentation fault, the conosle debug displays a bounch of ```
            RTTI symbol not found for class 'QObject'

            VRoninV Offline
            VRoninV Offline
            VRonin
            wrote on last edited by
            #8

            @Gallo-Magico said in Can't find the invalid pointer:

            MainWindow::~MainWindow()
            {
            delete spacer;
            delete object;
            delete layout;
            delete wid;
            }

            Same problem here. If QObjects have a parent they get deleted when the parent gets deleted automatically, if you do it manually it's a double deletion.
            If debugging is becoming a mess change the type of your QObjects pointer to QPointer so the pointers will be set to null automatically on deletion and you won't be able to double-delete them

            "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
            ~Napoleon Bonaparte

            On a crusade to banish setIndexWidget() from the holy land of Qt

            kshegunovK G 2 Replies Last reply
            1
            • VRoninV VRonin

              @Gallo-Magico said in Can't find the invalid pointer:

              MainWindow::~MainWindow()
              {
              delete spacer;
              delete object;
              delete layout;
              delete wid;
              }

              Same problem here. If QObjects have a parent they get deleted when the parent gets deleted automatically, if you do it manually it's a double deletion.
              If debugging is becoming a mess change the type of your QObjects pointer to QPointer so the pointers will be set to null automatically on deletion and you won't be able to double-delete them

              kshegunovK Offline
              kshegunovK Offline
              kshegunov
              Moderators
              wrote on last edited by
              #9

              @VRonin said in Can't find the invalid pointer:

              Same problem here. If QObjects have a parent they get deleted when the parent gets deleted automatically, if you do it manually it's a double deletion.

              No it is not. The child notifies the parent when it goes away, so the parent detaches it from the list.

              Read and abide by the Qt Code of Conduct

              Christian EhrlicherC 1 Reply Last reply
              0
              • kshegunovK kshegunov

                @VRonin said in Can't find the invalid pointer:

                Same problem here. If QObjects have a parent they get deleted when the parent gets deleted automatically, if you do it manually it's a double deletion.

                No it is not. The child notifies the parent when it goes away, so the parent detaches it from the list.

                Christian EhrlicherC Offline
                Christian EhrlicherC Offline
                Christian Ehrlicher
                Lifetime Qt Champion
                wrote on last edited by
                #10

                @kshegunov said in Can't find the invalid pointer:

                No it is not. The child notifies the parent when it goes away, so the parent detaches it from the list.

                @VRonin forgot a sentence in if you do it manually it's a double deletion. - if you do it manually after the parent deleted it's children it's a double deletion :)

                Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
                Visit the Qt Academy at https://academy.qt.io/catalog

                1 Reply Last reply
                3
                • VRoninV VRonin

                  @Gallo-Magico said in Can't find the invalid pointer:

                  MainWindow::~MainWindow()
                  {
                  delete spacer;
                  delete object;
                  delete layout;
                  delete wid;
                  }

                  Same problem here. If QObjects have a parent they get deleted when the parent gets deleted automatically, if you do it manually it's a double deletion.
                  If debugging is becoming a mess change the type of your QObjects pointer to QPointer so the pointers will be set to null automatically on deletion and you won't be able to double-delete them

                  G Offline
                  G Offline
                  Gallo Magico
                  wrote on last edited by
                  #11

                  @VRonin I already deleted those too, but now I'm getting an error in Facelet::~Facelet(), the error is

                  The inferior stopped because it received a signal from the operating system.
                  
                  Signal name : 
                  SIGABRT
                  Signal meaning : 
                  Aborted
                  
                  1 Reply Last reply
                  0
                  • G Offline
                    G Offline
                    Gallo Magico
                    wrote on last edited by
                    #12

                    I figured out,there were a bounch of problem, first of all I used to double delete child widgets, like the layout(child of the main widget) and the other widget into the layout(child of the layout), then I got all my destructors empty but I got an error caused by deleting a location memory not allocated with new. In my case the dynamic matrix of facelet don't allocate the memory for each Facelet, then I turned facelets from Facelet** facelets into a Facelet*** facelets and changed init_facelets() to

                    void Face::init_facelets() {
                        facelets = new Facelet**[3];
                        for(int i = 0; i < 3; ++i) {
                            facelets[i] = new Facelet*[3];
                            for(int j = 0; j < 3; ++j) {
                                facelets[i][j] = new Facelet();
                            }
                        }
                    }
                    

                    When the program ends, Face::~Face() frees all the location corresponding to facelets[i][j], then I had to free the rest of the matrix, so now Face::~Face() looks like

                    Face::~Face() {
                        for(int i = 0; i < 3; ++i) {
                            delete[] facelets[i];
                        }
                        delete[] facelets;
                    }
                    

                    Now it works with no problem or any issue

                    1 Reply Last reply
                    0
                    • G Gallo Magico

                      I'm working with qt5.15 in qtCreator in ubuntu 20.04 and g++. My program compiles and works fine until I close the main window becuase I get the error in the title of the question. I read that this error occurs when there is a invalid pointer, I tried to find it in my program but I couldnt.

                      main.cpp

                      #include "MainWindow.h"
                      
                      #include <QApplication>
                      
                          int main(int argc, char *argv[])
                          {
                              QApplication a(argc, argv);
                              MainWindow w;
                              w.show();
                              return a.exec();
                          }
                      

                      MainWindow.h

                      #pragma once
                      
                      #include "Facelet.h"
                      #include "Face.h"
                      
                      #include <QMainWindow>
                      #include <QWidget>
                      #include <QSpacerItem>
                      
                      class MainWindow : public QMainWindow
                      {
                          Q_OBJECT
                      
                          using type = Face;
                      
                      public:
                          MainWindow(QWidget *parent = nullptr);
                          ~MainWindow();
                      
                      protected:
                      
                          virtual void resizeEvent(QResizeEvent*) override;
                      
                      private:
                      
                          void __init_spacers();
                      
                          QWidget* wid;
                          type* object;
                          QGridLayout* layout;
                          QSpacerItem* spacer;
                      
                      };
                      

                      MainWindow.cpp

                      #include "MainWindow.h"
                      
                      MainWindow::MainWindow(QWidget *parent)
                          : QMainWindow(parent)
                      {
                          object = new type();
                          layout = new QGridLayout();
                          wid = new QWidget();
                          __init_spacers();
                          layout->setContentsMargins(0,0,0,0);
                          layout->addWidget(object, 1, 1);
                          wid->setLayout(layout);
                          setCentralWidget(wid);
                      }
                      
                      MainWindow::~MainWindow()
                      {
                          delete spacer;
                          delete object;
                          delete layout;
                          delete wid;
                      }
                      
                      //protected
                      
                      void MainWindow::resizeEvent(QResizeEvent*) {
                          int side = (size().width() < size().height()) ? size().width() : size().height();
                          object->resize(side, side);
                      }
                      
                      //private
                      
                      void MainWindow::__init_spacers() {
                          spacer = new QSpacerItem(0,0, QSizePolicy::Expanding, QSizePolicy::Expanding);
                          layout->addItem(spacer, 0, 1);//top
                          layout->addItem(spacer, 1, 0);//left
                          layout->addItem(spacer, 2, 1);//bootom
                          layout->addItem(spacer, 1, 2);//right
                      }
                      

                      Face.h

                      #pragma once
                      
                      #include "Facelet.h"
                      #include <QGridLayout>
                      
                      class Face : public QWidget {
                      
                          Q_OBJECT
                      
                      public:
                      
                          explicit Face(QWidget* parent = nullptr);
                          ~Face();
                      
                          std::string get_pattern();
                      
                      protected:
                      
                          virtual void resizeEvent(QResizeEvent *event = nullptr) override;
                      
                      private:
                      
                          void __init_widget();
                          void __init_layout();
                          void __init_facelets();
                          void __update_facelets(int side);
                          void __delete_facelets();
                      
                          Facelet** facelets;
                          QGridLayout* layout;
                      
                          constexpr static unsigned int SIDE = 248;
                          constexpr static unsigned int SPACE = 10;
                      
                      };
                      

                      Face.cpp

                      #include "Face.h"
                      
                      Face::Face(QWidget* parent) : QWidget(parent) {
                          __init_facelets();
                          __update_facelets(75);
                          __init_layout();
                          __init_widget();
                      }
                      
                      Face::~Face() {
                          __delete_facelets();
                          delete layout;
                      }
                      
                      std::string Face::get_pattern() {
                          std::string result;
                          for(int i = 0; i < 3; ++i) {
                              for(int j = 0; j < 3; ++j) {
                                  result.push_back( char(Colors::list[facelets[i][j].id()].second) );
                              }
                          }
                          return result;
                      }
                      
                      //protected
                      
                      void Face::resizeEvent(QResizeEvent *event) {
                          int side = (size().width() > size().height()) ? size().width() : size().height();
                          int facelet_side = (side-8)/3;
                          __update_facelets(facelet_side);
                      }
                      
                      //private
                      
                      void Face::__init_widget() {
                          this->resize(SIDE, SIDE);
                          this->setMinimumSize(SIDE, SIDE);
                          this->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
                          this->setAttribute(Qt::WA_StyledBackground);
                          this->setStyleSheet("background-color: black;");
                          this->setLayout(layout);
                      }
                      
                      void Face::__init_layout() {
                          layout = new QGridLayout();
                          layout->setSpacing(2);
                          layout->setContentsMargins(2, 2, 2, 2);
                          for(int i = 0; i < 3; ++i) {
                              for(int j = 0; j < 3; ++j) {
                                  layout->addWidget(&facelets[i][j], i, j);
                              }
                          }
                      }
                      
                      void Face::__init_facelets() {
                          facelets = new Facelet*[3];
                          for(int i = 0; i < 3; ++i) {
                              facelets[i] = new Facelet[3];
                          }
                      }
                      
                      void Face::__update_facelets(int side) {
                          for(int i = 0; i < 3;++ i) {
                              for(int j = 0; j < 3; ++j) {
                                  facelets[i][j].setFixedSize(side, side);
                              }
                          }
                      }
                      
                      void Face::__delete_facelets() {
                          for(int i = 0; i < 3; ++i) {
                              delete[] facelets[i];
                          }
                          delete[] facelets;
                      }
                      

                      Facelette.h

                      #pragma once
                      
                      #include "Colors.h"
                      
                      #include <QPushButton>
                      #include <QPainter>
                      
                      class Facelet : public QPushButton {
                      
                          Q_OBJECT
                      
                      public:
                      
                          using id_type = Colors::Id;
                      
                          explicit Facelet(QWidget* parent = nullptr);
                          explicit Facelet(Colors::Id color, QWidget* parent = nullptr);
                          virtual ~Facelet();
                      
                          void reset();
                          void set_color(Colors::Id);
                          id_type id();
                      
                      protected:
                          virtual void paintEvent(QPaintEvent *e = nullptr) override;
                      
                      public slots:
                      
                          void __change_color();
                      
                      private:
                          
                          int _Id;
                      
                      };
                      

                      Facelet.cpp

                      #include "Facelet.h"
                      #include <QStyleOption>
                      
                      Facelet::Facelet(QWidget* parent) : QPushButton(parent) {
                          reset();
                          connect(this, SIGNAL(clicked()), SLOT(__change_color()));
                      }
                      
                      Facelet::Facelet(Colors::Id id_, QWidget* parent) : QPushButton(parent) {
                          set_color(id_);
                          connect(this, SIGNAL(clicked()), SLOT(__change_color()));
                      }
                      
                      Facelet::~Facelet() {}
                      
                      void Facelet::reset() {
                          _Id = -1;
                          this->setStyleSheet("background-color:lightGray;");
                      }
                      
                      void Facelet::set_color(Colors::Id _id) {
                          _Id = _id;
                          setStyleSheet(QString("background-color:")+Colors::list[_Id].first+";");
                      }
                      
                      Facelet::id_type Facelet::id() {
                          return Facelet::id_type(_Id);
                      }
                      
                      //protected
                      
                      void Facelet::paintEvent(QPaintEvent *) {
                          QStyleOption opt;
                          opt.init(this);
                          QPainter p(this);
                          style()->drawPrimitive(QStyle::PE_Widget, &opt, &p, this);
                      }
                      
                      //private slots
                      
                      void Facelet::__change_color() {
                          _Id = (_Id >= 5) ? 0 : (_Id+1);
                          set_color(Colors::Id(_Id));
                      }
                      

                      Colors.h

                      #pragma once
                      
                      #include "Rubix/Rubix.h"
                      
                      #include <array>
                      #include <utility>
                      #include <QColor>
                      
                      
                      struct Colors {
                      
                          using value_type = typename std::pair<QString, rbx::RColor>;
                          using array_type = typename std::array<value_type, 6>;
                          enum Id { Yellow, Red, Green, Orange, Blue, White };
                          static array_type list;
                      
                      };
                      

                      Colors.cpp

                      #include "Colors.h"
                      
                      Colors::array_type Colors::list = {
                          Colors::value_type("yellow", rbx::YELLOW),
                          Colors::value_type("rgb(255, 20, 20)", rbx::RED),
                          Colors::value_type("rgb(35, 255, 35)", rbx::GREEN),
                          Colors::value_type("rgb(255, 130, 20)", rbx::ORANGE),
                          Colors::value_type("blue", rbx::BLUE),
                          Colors::value_type("white", rbx::WHITE),
                      };
                      

                      when I close the window I get the following error

                      21:07:22: Starting /home/kubuntu/Desktop/projects/x64/RubbixSolver/Debug/GUI/build-GUI-Desktop_Qt_5_15_2_GCC_64bit-Profile/GUI ...
                      21:07:46: The program has unexpectedly finished.
                      21:07:46: The process was ended forcefully.
                      21:07:46: /home/kubuntu/Desktop/projects/x64/RubbixSolver/Debug/GUI/build-GUI-Desktop_Qt_5_15_2_GCC_64bit-Profile/GUI crashed.
                      

                      If I start the debug when I close the main window it says there is a problem in Face::~Face(), a small message-window pops up with the following message'The inferior stopped because it received a signal from the operating system. Signal name : SIGSEGV Signal meaning : Segmentation fault, the conosle debug displays a bounch of ```
                      RTTI symbol not found for class 'QObject'

                      VRoninV Offline
                      VRoninV Offline
                      VRonin
                      wrote on last edited by
                      #13

                      @Gallo-Magico said in Can't find the invalid pointer:

                      layout->addWidget(&facelets[i][j]

                      This sets Face as parent of facelets[i][j] so same error as before you are double deleting a QObject as the parent already deleted it

                      No it is not. The child notifies the parent when it goes away, so the parent detaches it from the list.

                      Good observation, I didn't explain myself well there.

                      P.S.
                      from https://en.cppreference.com/w/cpp/keyword

                      • identifiers with a double underscore anywhere are reserved
                      • identifiers that begin with an underscore followed by an uppercase letter are reserved

                      You should rename your methods/members

                      "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
                      ~Napoleon Bonaparte

                      On a crusade to banish setIndexWidget() from the holy land of Qt

                      G 1 Reply Last reply
                      2
                      • VRoninV VRonin

                        @Gallo-Magico said in Can't find the invalid pointer:

                        layout->addWidget(&facelets[i][j]

                        This sets Face as parent of facelets[i][j] so same error as before you are double deleting a QObject as the parent already deleted it

                        No it is not. The child notifies the parent when it goes away, so the parent detaches it from the list.

                        Good observation, I didn't explain myself well there.

                        P.S.
                        from https://en.cppreference.com/w/cpp/keyword

                        • identifiers with a double underscore anywhere are reserved
                        • identifiers that begin with an underscore followed by an uppercase letter are reserved

                        You should rename your methods/members

                        G Offline
                        G Offline
                        Gallo Magico
                        wrote on last edited by
                        #14

                        @VRonin I know about the methods that begin with __, I already changed

                        1 Reply Last reply
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