clang-tidy, qt: Fix `modernize-use-default-member-init` in headers

See https://clang.llvm.org/extra/clang-tidy/checks/modernize/use-default-member-init.html

61 files changed, 108 insertions, 167 deletions

diff --git a/src/qt/addressbookpage.cpp b/src/qt/addressbookpage.cpp
index a82bd5f73e..53cfa001ed 100644
--- a/src/qt/addressbookpage.cpp
+++ b/src/qt/addressbookpage.cpp
@@ -64,7 +64,6 @@ protected:
 AddressBookPage::AddressBookPage(const PlatformStyle *platformStyle, Mode _mode, Tabs _tab, QWidget *parent) :
     QDialog(parent, GUIUtil::dialog_flags),
     ui(new Ui::AddressBookPage),
-    model(nullptr),
     mode(_mode),
     tab(_tab)
 {
diff --git a/src/qt/addressbookpage.h b/src/qt/addressbookpage.h
index 144990f419..283209d00c 100644
--- a/src/qt/addressbookpage.h
+++ b/src/qt/addressbookpage.h
@@ -49,7 +49,7 @@ public Q_SLOTS:
 
 private:
     Ui::AddressBookPage *ui;
-    AddressTableModel *model;
+    AddressTableModel* model{nullptr};
     Mode mode;
     Tabs tab;
     QString returnValue;
diff --git a/src/qt/askpassphrasedialog.cpp b/src/qt/askpassphrasedialog.cpp
index f16700bfd9..d15aba5cdd 100644
--- a/src/qt/askpassphrasedialog.cpp
+++ b/src/qt/askpassphrasedialog.cpp
@@ -23,8 +23,6 @@ AskPassphraseDialog::AskPassphraseDialog(Mode _mode, QWidget *parent, SecureStri
     QDialog(parent, GUIUtil::dialog_flags),
     ui(new Ui::AskPassphraseDialog),
     mode(_mode),
-    model(nullptr),
-    fCapsLock(false),
     m_passphrase_out(passphrase_out)
 {
     ui->setupUi(this);
diff --git a/src/qt/askpassphrasedialog.h b/src/qt/askpassphrasedialog.h
index 66031b08d3..370ea1de7e 100644
--- a/src/qt/askpassphrasedialog.h
+++ b/src/qt/askpassphrasedialog.h
@@ -38,8 +38,8 @@ public:
 private:
     Ui::AskPassphraseDialog *ui;
     Mode mode;
-    WalletModel *model;
-    bool fCapsLock;
+    WalletModel* model{nullptr};
+    bool fCapsLock{false};
     SecureString* m_passphrase_out;
 
 private Q_SLOTS:
diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
index cc01e4d54a..10a02af799 100644
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -228,14 +228,8 @@ void DebugMessageHandler(QtMsgType type, const QMessageLogContext& context, cons
 static int qt_argc = 1;
 static const char* qt_argv = "bitcoin-qt";
 
-BitcoinApplication::BitcoinApplication():
-    QApplication(qt_argc, const_cast<char **>(&qt_argv)),
-    optionsModel(nullptr),
-    clientModel(nullptr),
-    window(nullptr),
-    pollShutdownTimer(nullptr),
-    returnValue(0),
-    platformStyle(nullptr)
+BitcoinApplication::BitcoinApplication()
+    : QApplication(qt_argc, const_cast<char**>(&qt_argv))
 {
     // Qt runs setlocale(LC_ALL, "") on initialization.
     RegisterMetaTypes();
diff --git a/src/qt/bitcoin.h b/src/qt/bitcoin.h
index 9ad37ca6c9..920b504806 100644
--- a/src/qt/bitcoin.h
+++ b/src/qt/bitcoin.h
@@ -97,16 +97,16 @@ protected:
 
 private:
     std::optional<InitExecutor> m_executor;
-    OptionsModel *optionsModel;
-    ClientModel *clientModel;
-    BitcoinGUI *window;
-    QTimer *pollShutdownTimer;
+    OptionsModel* optionsModel{nullptr};
+    ClientModel* clientModel{nullptr};
+    BitcoinGUI* window{nullptr};
+    QTimer* pollShutdownTimer{nullptr};
 #ifdef ENABLE_WALLET
     PaymentServer* paymentServer{nullptr};
     WalletController* m_wallet_controller{nullptr};
 #endif
-    int returnValue;
-    const PlatformStyle *platformStyle;
+    int returnValue{0};
+    const PlatformStyle* platformStyle{nullptr};
     std::unique_ptr<QWidget> shutdownWindow;
     SplashScreen* m_splash = nullptr;
     std::unique_ptr<interfaces::Node> m_node;
diff --git a/src/qt/bitcoinamountfield.cpp b/src/qt/bitcoinamountfield.cpp
index c92aecd095..4dd151cac0 100644
--- a/src/qt/bitcoinamountfield.cpp
+++ b/src/qt/bitcoinamountfield.cpp
@@ -217,9 +217,8 @@ Q_SIGNALS:
 
 #include <qt/bitcoinamountfield.moc>
 
-BitcoinAmountField::BitcoinAmountField(QWidget *parent) :
-    QWidget(parent),
-    amount(nullptr)
+BitcoinAmountField::BitcoinAmountField(QWidget* parent)
+    : QWidget(parent)
 {
     amount = new AmountSpinBox(this);
     amount->setLocale(QLocale::c());
diff --git a/src/qt/bitcoinamountfield.h b/src/qt/bitcoinamountfield.h
index a40cd38332..f710915a49 100644
--- a/src/qt/bitcoinamountfield.h
+++ b/src/qt/bitcoinamountfield.h
@@ -74,7 +74,7 @@ protected:
     bool eventFilter(QObject *object, QEvent *event) override;
 
 private:
-    AmountSpinBox *amount;
+    AmountSpinBox* amount{nullptr};
     QValueComboBox *unit;
 
 private Q_SLOTS:
diff --git a/src/qt/bitcoingui.cpp b/src/qt/bitcoingui.cpp
index 2bd38103ed..b5a397ef45 100644
--- a/src/qt/bitcoingui.cpp
+++ b/src/qt/bitcoingui.cpp
@@ -1541,10 +1541,8 @@ bool BitcoinGUI::isPrivacyModeActivated() const
     return m_mask_values_action->isChecked();
 }
 
-UnitDisplayStatusBarControl::UnitDisplayStatusBarControl(const PlatformStyle *platformStyle)
-    : optionsModel(nullptr),
-      menu(nullptr),
-      m_platform_style{platformStyle}
+UnitDisplayStatusBarControl::UnitDisplayStatusBarControl(const PlatformStyle* platformStyle)
+    : m_platform_style{platformStyle}
 {
     createContextMenu();
     setToolTip(tr("Unit to show amounts in. Click to select another unit."));
diff --git a/src/qt/bitcoingui.h b/src/qt/bitcoingui.h
index 912e9b95aa..37d9574f1d 100644
--- a/src/qt/bitcoingui.h
+++ b/src/qt/bitcoingui.h
@@ -333,8 +333,8 @@ protected:
     void changeEvent(QEvent* e) override;
 
 private:
-    OptionsModel *optionsModel;
-    QMenu* menu;
+    OptionsModel* optionsModel{nullptr};
+    QMenu* menu{nullptr};
     const PlatformStyle* m_platform_style;
 
     /** Shows context menu with Display Unit options by the mouse coordinates */
diff --git a/src/qt/clientmodel.cpp b/src/qt/clientmodel.cpp
index 092ffe7e5b..2770dcf46b 100644
--- a/src/qt/clientmodel.cpp
+++ b/src/qt/clientmodel.cpp
@@ -34,8 +34,6 @@ ClientModel::ClientModel(interfaces::Node& node, OptionsModel *_optionsModel, QO
     QObject(parent),
     m_node(node),
     optionsModel(_optionsModel),
-    peerTableModel(nullptr),
-    banTableModel(nullptr),
     m_thread(new QThread(this))
 {
     cachedBestHeaderHeight = -1;
diff --git a/src/qt/clientmodel.h b/src/qt/clientmodel.h
index 4a6abd6a76..69e091cfd5 100644
--- a/src/qt/clientmodel.h
+++ b/src/qt/clientmodel.h
@@ -104,9 +104,9 @@ private:
     std::unique_ptr<interfaces::Handler> m_handler_notify_block_tip;
     std::unique_ptr<interfaces::Handler> m_handler_notify_header_tip;
     OptionsModel *optionsModel;
-    PeerTableModel *peerTableModel;
+    PeerTableModel* peerTableModel{nullptr};
     PeerTableSortProxy* m_peer_table_sort_proxy{nullptr};
-    BanTableModel *banTableModel;
+    BanTableModel* banTableModel{nullptr};
 
     //! A thread to interact with m_node asynchronously
     QThread* const m_thread;
diff --git a/src/qt/csvmodelwriter.cpp b/src/qt/csvmodelwriter.cpp
index 656afb6e87..445ea41475 100644
--- a/src/qt/csvmodelwriter.cpp
+++ b/src/qt/csvmodelwriter.cpp
@@ -8,9 +8,9 @@
 #include <QFile>
 #include <QTextStream>
 
-CSVModelWriter::CSVModelWriter(const QString &_filename, QObject *parent) :
-    QObject(parent),
-    filename(_filename), model(nullptr)
+CSVModelWriter::CSVModelWriter(const QString& _filename, QObject* parent)
+    : QObject(parent),
+      filename(_filename)
 {
 }
 
diff --git a/src/qt/csvmodelwriter.h b/src/qt/csvmodelwriter.h
index ad247b6859..a1e77826a8 100644
--- a/src/qt/csvmodelwriter.h
+++ b/src/qt/csvmodelwriter.h
@@ -32,7 +32,7 @@ public:
 
 private:
     QString filename;
-    const QAbstractItemModel *model;
+    const QAbstractItemModel* model{nullptr};
 
     struct Column
     {
diff --git a/src/qt/editaddressdialog.cpp b/src/qt/editaddressdialog.cpp
index fa27635981..9b3319415d 100644
--- a/src/qt/editaddressdialog.cpp
+++ b/src/qt/editaddressdialog.cpp
@@ -12,12 +12,10 @@
 #include <QMessageBox>
 
 
-EditAddressDialog::EditAddressDialog(Mode _mode, QWidget *parent) :
-    QDialog(parent, GUIUtil::dialog_flags),
-    ui(new Ui::EditAddressDialog),
-    mapper(nullptr),
-    mode(_mode),
-    model(nullptr)
+EditAddressDialog::EditAddressDialog(Mode _mode, QWidget* parent)
+    : QDialog(parent, GUIUtil::dialog_flags),
+      ui(new Ui::EditAddressDialog),
+      mode(_mode)
 {
     ui->setupUi(this);
 
diff --git a/src/qt/editaddressdialog.h b/src/qt/editaddressdialog.h
index f7ad80bb2d..7bfadcfbcc 100644
--- a/src/qt/editaddressdialog.h
+++ b/src/qt/editaddressdialog.h
@@ -49,9 +49,9 @@ private:
     QString getDuplicateAddressWarning() const;
 
     Ui::EditAddressDialog *ui;
-    QDataWidgetMapper *mapper;
+    QDataWidgetMapper* mapper{nullptr};
     Mode mode;
-    AddressTableModel *model;
+    AddressTableModel* model{nullptr};
 
     QString address;
 };
diff --git a/src/qt/intro.cpp b/src/qt/intro.cpp
index 4c8b33bf28..9ddc7169ee 100644
--- a/src/qt/intro.cpp
+++ b/src/qt/intro.cpp
@@ -122,8 +122,6 @@ int GetPruneTargetGB()
 Intro::Intro(QWidget *parent, int64_t blockchain_size_gb, int64_t chain_state_size_gb) :
     QDialog(parent, GUIUtil::dialog_flags),
     ui(new Ui::Intro),
-    thread(nullptr),
-    signalled(false),
     m_blockchain_size_gb(blockchain_size_gb),
     m_chain_state_size_gb(chain_state_size_gb),
     m_prune_target_gb{GetPruneTargetGB()}
diff --git a/src/qt/intro.h b/src/qt/intro.h
index d9c45007e1..900c657b27 100644
--- a/src/qt/intro.h
+++ b/src/qt/intro.h
@@ -64,9 +64,9 @@ private Q_SLOTS:
 
 private:
     Ui::Intro *ui;
-    QThread *thread;
+    QThread* thread{nullptr};
     QMutex mutex;
-    bool signalled;
+    bool signalled{false};
     QString pathToCheck;
     const int64_t m_blockchain_size_gb;
     const int64_t m_chain_state_size_gb;
diff --git a/src/qt/modaloverlay.cpp b/src/qt/modaloverlay.cpp
index dfa33764f6..66f09fd947 100644
--- a/src/qt/modaloverlay.cpp
+++ b/src/qt/modaloverlay.cpp
@@ -12,13 +12,10 @@
 #include <QPropertyAnimation>
 #include <QResizeEvent>
 
-ModalOverlay::ModalOverlay(bool enable_wallet, QWidget *parent) :
-QWidget(parent),
-ui(new Ui::ModalOverlay),
-bestHeaderHeight(0),
-bestHeaderDate(QDateTime()),
-layerIsVisible(false),
-userClosed(false)
+ModalOverlay::ModalOverlay(bool enable_wallet, QWidget* parent)
+    : QWidget(parent),
+      ui(new Ui::ModalOverlay),
+      bestHeaderDate(QDateTime())
 {
     ui->setupUi(this);
     connect(ui->closeButton, &QPushButton::clicked, this, &ModalOverlay::closeClicked);
diff --git a/src/qt/modaloverlay.h b/src/qt/modaloverlay.h
index 682c94cd01..aa470caf07 100644
--- a/src/qt/modaloverlay.h
+++ b/src/qt/modaloverlay.h
@@ -45,11 +45,11 @@ protected:
 
 private:
     Ui::ModalOverlay *ui;
-    int bestHeaderHeight; //best known height (based on the headers)
+    int bestHeaderHeight{0}; // best known height (based on the headers)
     QDateTime bestHeaderDate;
     QVector<QPair<qint64, double> > blockProcessTime;
-    bool layerIsVisible;
-    bool userClosed;
+    bool layerIsVisible{false};
+    bool userClosed{false};
     QPropertyAnimation m_animation;
     void UpdateHeaderSyncLabel();
     void UpdateHeaderPresyncLabel(int height, const QDateTime& blockDate);
diff --git a/src/qt/notificator.cpp b/src/qt/notificator.cpp
index b311a9f32e..41ce13dba4 100644
--- a/src/qt/notificator.cpp
+++ b/src/qt/notificator.cpp
@@ -32,11 +32,7 @@ Notificator::Notificator(const QString &_programName, QSystemTrayIcon *_trayIcon
     QObject(_parent),
     parent(_parent),
     programName(_programName),
-    mode(None),
     trayIcon(_trayIcon)
-#ifdef USE_DBUS
-    ,interface(nullptr)
-#endif
 {
     if(_trayIcon && _trayIcon->supportsMessages())
     {
diff --git a/src/qt/notificator.h b/src/qt/notificator.h
index 642d2b29ae..b338637c67 100644
--- a/src/qt/notificator.h
+++ b/src/qt/notificator.h
@@ -61,10 +61,10 @@ private:
         UserNotificationCenter      /**< Use the 10.8+ User Notification Center (Mac only) */
     };
     QString programName;
-    Mode mode;
+    Mode mode{None};
     QSystemTrayIcon *trayIcon;
 #ifdef USE_DBUS
-    QDBusInterface *interface;
+    QDBusInterface* interface{nullptr};
 
     void notifyDBus(Class cls, const QString &title, const QString &text, const QIcon &icon, int millisTimeout);
 #endif
diff --git a/src/qt/optionsdialog.cpp b/src/qt/optionsdialog.cpp
index 7c91eac37e..bfe946bf6b 100644
--- a/src/qt/optionsdialog.cpp
+++ b/src/qt/optionsdialog.cpp
@@ -31,11 +31,9 @@
 #include <QSystemTrayIcon>
 #include <QTimer>
 
-OptionsDialog::OptionsDialog(QWidget *parent, bool enableWallet) :
-    QDialog(parent, GUIUtil::dialog_flags),
-    ui(new Ui::OptionsDialog),
-    model(nullptr),
-    mapper(nullptr)
+OptionsDialog::OptionsDialog(QWidget* parent, bool enableWallet)
+    : QDialog(parent, GUIUtil::dialog_flags),
+      ui(new Ui::OptionsDialog)
 {
     ui->setupUi(this);
 
diff --git a/src/qt/optionsdialog.h b/src/qt/optionsdialog.h
index e5a19d5025..c14f912cf8 100644
--- a/src/qt/optionsdialog.h
+++ b/src/qt/optionsdialog.h
@@ -75,8 +75,8 @@ Q_SIGNALS:
 private:
     Ui::OptionsDialog *ui;
     ClientModel* m_client_model{nullptr};
-    OptionsModel *model;
-    QDataWidgetMapper *mapper;
+    OptionsModel* model{nullptr};
+    QDataWidgetMapper* mapper{nullptr};
 };
 
 #endif // BITCOIN_QT_OPTIONSDIALOG_H
diff --git a/src/qt/overviewpage.cpp b/src/qt/overviewpage.cpp
index 85a3c36f39..d56e8ce750 100644
--- a/src/qt/overviewpage.cpp
+++ b/src/qt/overviewpage.cpp
@@ -140,8 +140,6 @@ private:
 OverviewPage::OverviewPage(const PlatformStyle *platformStyle, QWidget *parent) :
     QWidget(parent),
     ui(new Ui::OverviewPage),
-    clientModel(nullptr),
-    walletModel(nullptr),
     m_platform_style{platformStyle},
     txdelegate(new TxViewDelegate(platformStyle, this))
 {
diff --git a/src/qt/overviewpage.h b/src/qt/overviewpage.h
index 56f45907db..4c6ae6be58 100644
--- a/src/qt/overviewpage.h
+++ b/src/qt/overviewpage.h
@@ -50,8 +50,8 @@ protected:
 
 private:
     Ui::OverviewPage *ui;
-    ClientModel *clientModel;
-    WalletModel *walletModel;
+    ClientModel* clientModel{nullptr};
+    WalletModel* walletModel{nullptr};
     bool m_privacy{false};
 
     const PlatformStyle* m_platform_style;
diff --git a/src/qt/paymentserver.cpp b/src/qt/paymentserver.cpp
index 9f87c15c94..9ddbe789ff 100644
--- a/src/qt/paymentserver.cpp
+++ b/src/qt/paymentserver.cpp
@@ -126,11 +126,8 @@ bool PaymentServer::ipcSendCommandLine()
     return fResult;
 }
 
-PaymentServer::PaymentServer(QObject* parent, bool startLocalServer) :
-    QObject(parent),
-    saveURIs(true),
-    uriServer(nullptr),
-    optionsModel(nullptr)
+PaymentServer::PaymentServer(QObject* parent, bool startLocalServer)
+    : QObject(parent)
 {
     // Install global event filter to catch QFileOpenEvents
     // on Mac: sent when you click bitcoin: links
diff --git a/src/qt/paymentserver.h b/src/qt/paymentserver.h
index 08b83244ab..63f4faa772 100644
--- a/src/qt/paymentserver.h
+++ b/src/qt/paymentserver.h
@@ -101,9 +101,9 @@ protected:
     bool eventFilter(QObject *object, QEvent *event) override;
 
 private:
-    bool saveURIs;                      // true during startup
-    QLocalServer* uriServer;
-    OptionsModel *optionsModel;
+    bool saveURIs{true}; // true during startup
+    QLocalServer* uriServer{nullptr};
+    OptionsModel* optionsModel{nullptr};
 };
 
 #endif // BITCOIN_QT_PAYMENTSERVER_H
diff --git a/src/qt/peertablemodel.cpp b/src/qt/peertablemodel.cpp
index b7de88225e..2797d830a5 100644
--- a/src/qt/peertablemodel.cpp
+++ b/src/qt/peertablemodel.cpp
@@ -14,10 +14,9 @@
 #include <QList>
 #include <QTimer>
 
-PeerTableModel::PeerTableModel(interfaces::Node& node, QObject* parent) :
-    QAbstractTableModel(parent),
-    m_node(node),
-    timer(nullptr)
+PeerTableModel::PeerTableModel(interfaces::Node& node, QObject* parent)
+    : QAbstractTableModel(parent),
+      m_node(node)
 {
     // set up timer for auto refresh
     timer = new QTimer(this);
diff --git a/src/qt/peertablemodel.h b/src/qt/peertablemodel.h
index e2515de775..9cbdad4374 100644
--- a/src/qt/peertablemodel.h
+++ b/src/qt/peertablemodel.h
@@ -110,7 +110,7 @@ private:
         /*: Title of Peers Table column which contains the peer's
             User Agent string. */
         tr("User Agent")};
-    QTimer *timer;
+    QTimer* timer{nullptr};
 };
 
 #endif // BITCOIN_QT_PEERTABLEMODEL_H
diff --git a/src/qt/qrimagewidget.cpp b/src/qt/qrimagewidget.cpp
index 05a67117b6..00f928b355 100644
--- a/src/qt/qrimagewidget.cpp
+++ b/src/qt/qrimagewidget.cpp
@@ -23,8 +23,8 @@
 #include <qrencode.h>
 #endif
 
-QRImageWidget::QRImageWidget(QWidget *parent):
-    QLabel(parent), contextMenu(nullptr)
+QRImageWidget::QRImageWidget(QWidget* parent)
+    : QLabel(parent)
 {
     contextMenu = new QMenu(this);
     contextMenu->addAction(tr("&Save Image…"), this, &QRImageWidget::saveImage);
diff --git a/src/qt/qrimagewidget.h b/src/qt/qrimagewidget.h
index 5dbba074a1..d9ca2b899f 100644
--- a/src/qt/qrimagewidget.h
+++ b/src/qt/qrimagewidget.h
@@ -41,7 +41,7 @@ protected:
     virtual void contextMenuEvent(QContextMenuEvent *event) override;
 
 private:
-    QMenu *contextMenu;
+    QMenu* contextMenu{nullptr};
 };
 
 #endif // BITCOIN_QT_QRIMAGEWIDGET_H
diff --git a/src/qt/qvalidatedlineedit.cpp b/src/qt/qvalidatedlineedit.cpp
index bd4df75d23..db4e377b87 100644
--- a/src/qt/qvalidatedlineedit.cpp
+++ b/src/qt/qvalidatedlineedit.cpp
@@ -7,10 +7,8 @@
 #include <qt/bitcoinaddressvalidator.h>
 #include <qt/guiconstants.h>
 
-QValidatedLineEdit::QValidatedLineEdit(QWidget *parent) :
-    QLineEdit(parent),
-    valid(true),
-    checkValidator(nullptr)
+QValidatedLineEdit::QValidatedLineEdit(QWidget* parent)
+    : QLineEdit(parent)
 {
     connect(this, &QValidatedLineEdit::textChanged, this, &QValidatedLineEdit::markValid);
 }
diff --git a/src/qt/qvalidatedlineedit.h b/src/qt/qvalidatedlineedit.h
index 12d35aa264..b26e2020c5 100644
--- a/src/qt/qvalidatedlineedit.h
+++ b/src/qt/qvalidatedlineedit.h
@@ -25,8 +25,8 @@ protected:
     void focusOutEvent(QFocusEvent *evt) override;
 
 private:
-    bool valid;
-    const QValidator *checkValidator;
+    bool valid{true};
+    const QValidator* checkValidator{nullptr};
 
 public Q_SLOTS:
     void setText(const QString&);
diff --git a/src/qt/qvaluecombobox.cpp b/src/qt/qvaluecombobox.cpp
index f94486a2f3..c163ba56dc 100644
--- a/src/qt/qvaluecombobox.cpp
+++ b/src/qt/qvaluecombobox.cpp
@@ -4,8 +4,8 @@
 
 #include <qt/qvaluecombobox.h>
 
-QValueComboBox::QValueComboBox(QWidget *parent) :
-        QComboBox(parent), role(Qt::UserRole)
+QValueComboBox::QValueComboBox(QWidget* parent)
+    : QComboBox(parent)
 {
     connect(this, qOverload<int>(&QComboBox::currentIndexChanged), this, &QValueComboBox::handleSelectionChanged);
 }
diff --git a/src/qt/qvaluecombobox.h b/src/qt/qvaluecombobox.h
index bde9c0d1a6..14379dd612 100644
--- a/src/qt/qvaluecombobox.h
+++ b/src/qt/qvaluecombobox.h
@@ -28,7 +28,7 @@ Q_SIGNALS:
     void valueChanged();
 
 private:
-    int role;
+    int role{Qt::UserRole};
 
 private Q_SLOTS:
     void handleSelectionChanged(int idx);
diff --git a/src/qt/receivecoinsdialog.cpp b/src/qt/receivecoinsdialog.cpp
index 3c80c01160..f7dd5f7c91 100644
--- a/src/qt/receivecoinsdialog.cpp
+++ b/src/qt/receivecoinsdialog.cpp
@@ -25,7 +25,6 @@
 ReceiveCoinsDialog::ReceiveCoinsDialog(const PlatformStyle *_platformStyle, QWidget *parent) :
     QDialog(parent, GUIUtil::dialog_flags),
     ui(new Ui::ReceiveCoinsDialog),
-    model(nullptr),
     platformStyle(_platformStyle)
 {
     ui->setupUi(this);
diff --git a/src/qt/receivecoinsdialog.h b/src/qt/receivecoinsdialog.h
index a089b8aa6a..0bb02ebcf2 100644
--- a/src/qt/receivecoinsdialog.h
+++ b/src/qt/receivecoinsdialog.h
@@ -51,7 +51,7 @@ public Q_SLOTS:
 
 private:
     Ui::ReceiveCoinsDialog *ui;
-    WalletModel *model;
+    WalletModel* model{nullptr};
     QMenu *contextMenu;
     QAction* copyLabelAction;
     QAction* copyMessageAction;
diff --git a/src/qt/receiverequestdialog.cpp b/src/qt/receiverequestdialog.cpp
index c0135283b1..3453857f98 100644
--- a/src/qt/receiverequestdialog.cpp
+++ b/src/qt/receiverequestdialog.cpp
@@ -18,10 +18,9 @@
 #include <config/bitcoin-config.h> /* for USE_QRCODE */
 #endif
 
-ReceiveRequestDialog::ReceiveRequestDialog(QWidget *parent) :
-    QDialog(parent, GUIUtil::dialog_flags),
-    ui(new Ui::ReceiveRequestDialog),
-    model(nullptr)
+ReceiveRequestDialog::ReceiveRequestDialog(QWidget* parent)
+    : QDialog(parent, GUIUtil::dialog_flags),
+      ui(new Ui::ReceiveRequestDialog)
 {
     ui->setupUi(this);
     GUIUtil::handleCloseWindowShortcut(this);
diff --git a/src/qt/receiverequestdialog.h b/src/qt/receiverequestdialog.h
index c861680761..d64fee3663 100644
--- a/src/qt/receiverequestdialog.h
+++ b/src/qt/receiverequestdialog.h
@@ -33,7 +33,7 @@ private Q_SLOTS:
 
 private:
     Ui::ReceiveRequestDialog *ui;
-    WalletModel *model;
+    WalletModel* model{nullptr};
     SendCoinsRecipient info;
 };
 
diff --git a/src/qt/recentrequeststablemodel.h b/src/qt/recentrequeststablemodel.h
index cf7cd24ce2..151f8322a8 100644
--- a/src/qt/recentrequeststablemodel.h
+++ b/src/qt/recentrequeststablemodel.h
@@ -18,11 +18,11 @@ class WalletModel;
 class RecentRequestEntry
 {
 public:
-    RecentRequestEntry() : nVersion(RecentRequestEntry::CURRENT_VERSION), id(0) { }
+    RecentRequestEntry() : nVersion(RecentRequestEntry::CURRENT_VERSION) {}
 
     static const int CURRENT_VERSION = 1;
     int nVersion;
-    int64_t id;
+    int64_t id{0};
     QDateTime date;
     SendCoinsRecipient recipient;
 
diff --git a/src/qt/sendcoinsdialog.cpp b/src/qt/sendcoinsdialog.cpp
index 57094fc857..cb44e99325 100644
--- a/src/qt/sendcoinsdialog.cpp
+++ b/src/qt/sendcoinsdialog.cpp
@@ -64,11 +64,7 @@ int getIndexForConfTarget(int target) {
 SendCoinsDialog::SendCoinsDialog(const PlatformStyle *_platformStyle, QWidget *parent) :
     QDialog(parent, GUIUtil::dialog_flags),
     ui(new Ui::SendCoinsDialog),
-    clientModel(nullptr),
-    model(nullptr),
     m_coin_control(new CCoinControl),
-    fNewRecipientAllowed(true),
-    fFeeMinimized(true),
     platformStyle(_platformStyle)
 {
     ui->setupUi(this);
diff --git a/src/qt/sendcoinsdialog.h b/src/qt/sendcoinsdialog.h
index dcdf189532..d22020da9f 100644
--- a/src/qt/sendcoinsdialog.h
+++ b/src/qt/sendcoinsdialog.h
@@ -62,12 +62,12 @@ Q_SIGNALS:
 
 private:
     Ui::SendCoinsDialog *ui;
-    ClientModel *clientModel;
-    WalletModel *model;
+    ClientModel* clientModel{nullptr};
+    WalletModel* model{nullptr};
     std::unique_ptr<wallet::CCoinControl> m_coin_control;
     std::unique_ptr<WalletModelTransaction> m_current_transaction;
-    bool fNewRecipientAllowed;
-    bool fFeeMinimized;
+    bool fNewRecipientAllowed{true};
+    bool fFeeMinimized{true};
     const PlatformStyle *platformStyle;
 
     // Copy PSBT to clipboard and offer to save it.
diff --git a/src/qt/sendcoinsentry.cpp b/src/qt/sendcoinsentry.cpp
index af514d5a43..ed2f657cfe 100644
--- a/src/qt/sendcoinsentry.cpp
+++ b/src/qt/sendcoinsentry.cpp
@@ -22,7 +22,6 @@
 SendCoinsEntry::SendCoinsEntry(const PlatformStyle *_platformStyle, QWidget *parent) :
     QWidget(parent),
     ui(new Ui::SendCoinsEntry),
-    model(nullptr),
     platformStyle(_platformStyle)
 {
     ui->setupUi(this);
diff --git a/src/qt/sendcoinsentry.h b/src/qt/sendcoinsentry.h
index ea9d58fbf8..854116bd47 100644
--- a/src/qt/sendcoinsentry.h
+++ b/src/qt/sendcoinsentry.h
@@ -73,7 +73,7 @@ protected:
 private:
     SendCoinsRecipient recipient;
     Ui::SendCoinsEntry *ui;
-    WalletModel *model;
+    WalletModel* model{nullptr};
     const PlatformStyle *platformStyle;
 
     bool updateLabel(const QString &address);
diff --git a/src/qt/signverifymessagedialog.cpp b/src/qt/signverifymessagedialog.cpp
index 1f4b30534b..9e7132e862 100644
--- a/src/qt/signverifymessagedialog.cpp
+++ b/src/qt/signverifymessagedialog.cpp
@@ -21,7 +21,6 @@
 SignVerifyMessageDialog::SignVerifyMessageDialog(const PlatformStyle *_platformStyle, QWidget *parent) :
     QDialog(parent, GUIUtil::dialog_flags),
     ui(new Ui::SignVerifyMessageDialog),
-    model(nullptr),
     platformStyle(_platformStyle)
 {
     ui->setupUi(this);
diff --git a/src/qt/signverifymessagedialog.h b/src/qt/signverifymessagedialog.h
index 1a3708bf8f..4072707b61 100644
--- a/src/qt/signverifymessagedialog.h
+++ b/src/qt/signverifymessagedialog.h
@@ -35,7 +35,7 @@ protected:
 
 private:
     Ui::SignVerifyMessageDialog *ui;
-    WalletModel *model;
+    WalletModel* model{nullptr};
     const PlatformStyle *platformStyle;
 
 private Q_SLOTS:
diff --git a/src/qt/splashscreen.cpp b/src/qt/splashscreen.cpp
index bf04a6dd5f..7807797f5e 100644
--- a/src/qt/splashscreen.cpp
+++ b/src/qt/splashscreen.cpp
@@ -28,7 +28,7 @@
 
 
 SplashScreen::SplashScreen(const NetworkStyle* networkStyle)
-    : QWidget(), curAlignment(0)
+    : QWidget()
 {
     // set reference point, paddings
     int paddingRight            = 50;
diff --git a/src/qt/splashscreen.h b/src/qt/splashscreen.h
index c14fc521a7..9d6a619ce7 100644
--- a/src/qt/splashscreen.h
+++ b/src/qt/splashscreen.h
@@ -60,7 +60,7 @@ private:
     QPixmap pixmap;
     QString curMessage;
     QColor curColor;
-    int curAlignment;
+    int curAlignment{0};
 
     interfaces::Node* m_node = nullptr;
     bool m_shutdown = false;
diff --git a/src/qt/trafficgraphwidget.cpp b/src/qt/trafficgraphwidget.cpp
index aebd44d5f7..2558d63a8e 100644
--- a/src/qt/trafficgraphwidget.cpp
+++ b/src/qt/trafficgraphwidget.cpp
@@ -19,15 +19,10 @@
 #define XMARGIN                 10
 #define YMARGIN                 10
 
-TrafficGraphWidget::TrafficGraphWidget(QWidget *parent) :
-    QWidget(parent),
-    timer(nullptr),
-    fMax(0.0f),
-    vSamplesIn(),
-    vSamplesOut(),
-    nLastBytesIn(0),
-    nLastBytesOut(0),
-    clientModel(nullptr)
+TrafficGraphWidget::TrafficGraphWidget(QWidget* parent)
+    : QWidget(parent),
+      vSamplesIn(),
+      vSamplesOut()
 {
     timer = new QTimer(this);
     connect(timer, &QTimer::timeout, this, &TrafficGraphWidget::updateRates);
diff --git a/src/qt/trafficgraphwidget.h b/src/qt/trafficgraphwidget.h
index a40b734540..af9f261946 100644
--- a/src/qt/trafficgraphwidget.h
+++ b/src/qt/trafficgraphwidget.h
@@ -37,14 +37,14 @@ public Q_SLOTS:
 private:
     void paintPath(QPainterPath &path, QQueue<float> &samples);
 
-    QTimer *timer;
-    float fMax;
+    QTimer* timer{nullptr};
+    float fMax{0.0f};
     std::chrono::minutes m_range{0};
     QQueue<float> vSamplesIn;
     QQueue<float> vSamplesOut;
-    quint64 nLastBytesIn;
-    quint64 nLastBytesOut;
-    ClientModel *clientModel;
+    quint64 nLastBytesIn{0};
+    quint64 nLastBytesOut{0};
+    ClientModel* clientModel{nullptr};
 };
 
 #endif // BITCOIN_QT_TRAFFICGRAPHWIDGET_H
diff --git a/src/qt/transactionfilterproxy.cpp b/src/qt/transactionfilterproxy.cpp
index 3be7e1a969..3cc0cc839d 100644
--- a/src/qt/transactionfilterproxy.cpp
+++ b/src/qt/transactionfilterproxy.cpp
@@ -11,14 +11,10 @@
 #include <cstdlib>
 #include <optional>
 
-TransactionFilterProxy::TransactionFilterProxy(QObject *parent) :
-    QSortFilterProxyModel(parent),
-    m_search_string(),
-    typeFilter(ALL_TYPES),
-    watchOnlyFilter(WatchOnlyFilter_All),
-    minAmount(0),
-    limitRows(-1),
-    showInactive(true)
+TransactionFilterProxy::TransactionFilterProxy(QObject* parent)
+    : QSortFilterProxyModel(parent),
+      m_search_string(),
+      typeFilter(ALL_TYPES)
 {
 }
 
diff --git a/src/qt/transactionfilterproxy.h b/src/qt/transactionfilterproxy.h
index fd9be52842..8e5f72d764 100644
--- a/src/qt/transactionfilterproxy.h
+++ b/src/qt/transactionfilterproxy.h
@@ -58,10 +58,10 @@ private:
     std::optional<QDateTime> dateTo;
     QString m_search_string;
     quint32 typeFilter;
-    WatchOnlyFilter watchOnlyFilter;
-    CAmount minAmount;
-    int limitRows;
-    bool showInactive;
+    WatchOnlyFilter watchOnlyFilter{WatchOnlyFilter_All};
+    CAmount minAmount{0};
+    int limitRows{-1};
+    bool showInactive{true};
 };
 
 #endif // BITCOIN_QT_TRANSACTIONFILTERPROXY_H
diff --git a/src/qt/transactiontablemodel.cpp b/src/qt/transactiontablemodel.cpp
index 4312b3cd24..7072881ec1 100644
--- a/src/qt/transactiontablemodel.cpp
+++ b/src/qt/transactiontablemodel.cpp
@@ -253,7 +253,6 @@ TransactionTableModel::TransactionTableModel(const PlatformStyle *_platformStyle
         QAbstractTableModel(parent),
         walletModel(parent),
         priv(new TransactionTablePriv(this)),
-        fProcessingQueuedTransactions(false),
         platformStyle(_platformStyle)
 {
     subscribeToCoreSignals();
diff --git a/src/qt/transactiontablemodel.h b/src/qt/transactiontablemodel.h
index f8576edd59..92ba9bf894 100644
--- a/src/qt/transactiontablemodel.h
+++ b/src/qt/transactiontablemodel.h
@@ -89,7 +89,7 @@ private:
     std::unique_ptr<interfaces::Handler> m_handler_show_progress;
     QStringList columns;
     TransactionTablePriv *priv;
-    bool fProcessingQueuedTransactions;
+    bool fProcessingQueuedTransactions{false};
     const PlatformStyle *platformStyle;
 
     void subscribeToCoreSignals();
diff --git a/src/qt/walletmodel.cpp b/src/qt/walletmodel.cpp
index ed0602594b..138b0c93bd 100644
--- a/src/qt/walletmodel.cpp
+++ b/src/qt/walletmodel.cpp
@@ -46,10 +46,6 @@ WalletModel::WalletModel(std::unique_ptr<interfaces::Wallet> wallet, ClientModel
     m_client_model(&client_model),
     m_node(client_model.node()),
     optionsModel(client_model.getOptionsModel()),
-    addressTableModel(nullptr),
-    transactionTableModel(nullptr),
-    recentRequestsTableModel(nullptr),
-    cachedEncryptionStatus(Unencrypted),
     timer(new QTimer(this))
 {
     fHaveWatchOnly = m_wallet->haveWatchOnly();
diff --git a/src/qt/walletmodel.h b/src/qt/walletmodel.h
index 73dfe0386a..7c8374e7dd 100644
--- a/src/qt/walletmodel.h
+++ b/src/qt/walletmodel.h
@@ -181,13 +181,13 @@ private:
     // (transaction fee, for example)
     OptionsModel *optionsModel;
 
-    AddressTableModel *addressTableModel;
-    TransactionTableModel *transactionTableModel;
-    RecentRequestsTableModel *recentRequestsTableModel;
+    AddressTableModel* addressTableModel{nullptr};
+    TransactionTableModel* transactionTableModel{nullptr};
+    RecentRequestsTableModel* recentRequestsTableModel{nullptr};
 
     // Cache some values to be able to detect changes
     interfaces::WalletBalances m_cached_balances;
-    EncryptionStatus cachedEncryptionStatus;
+    EncryptionStatus cachedEncryptionStatus{Unencrypted};
     QTimer* timer;
 
     // Block hash denoting when the last balance update was done.
diff --git a/src/qt/walletmodeltransaction.cpp b/src/qt/walletmodeltransaction.cpp
index b5538b644f..3178920cf6 100644
--- a/src/qt/walletmodeltransaction.cpp
+++ b/src/qt/walletmodeltransaction.cpp
@@ -10,9 +10,8 @@
 
 #include <policy/policy.h>
 
-WalletModelTransaction::WalletModelTransaction(const QList<SendCoinsRecipient> &_recipients) :
-    recipients(_recipients),
-    fee(0)
+WalletModelTransaction::WalletModelTransaction(const QList<SendCoinsRecipient>& _recipients)
+    : recipients(_recipients)
 {
 }
 
diff --git a/src/qt/walletmodeltransaction.h b/src/qt/walletmodeltransaction.h
index 28fb551364..0e6ed8be49 100644
--- a/src/qt/walletmodeltransaction.h
+++ b/src/qt/walletmodeltransaction.h
@@ -41,7 +41,7 @@ public:
 private:
     QList<SendCoinsRecipient> recipients;
     CTransactionRef wtx;
-    CAmount fee;
+    CAmount fee{0};
 };
 
 #endif // BITCOIN_QT_WALLETMODELTRANSACTION_H
diff --git a/src/qt/walletview.cpp b/src/qt/walletview.cpp
index 10fc0fb6d0..937a9d4d74 100644
--- a/src/qt/walletview.cpp
+++ b/src/qt/walletview.cpp
@@ -31,7 +31,6 @@
 
 WalletView::WalletView(WalletModel* wallet_model, const PlatformStyle* _platformStyle, QWidget* parent)
     : QStackedWidget(parent),
-      clientModel(nullptr),
       walletModel(wallet_model),
       platformStyle(_platformStyle)
 {
diff --git a/src/qt/walletview.h b/src/qt/walletview.h
index 301084ffa9..ebceef9cf9 100644
--- a/src/qt/walletview.h
+++ b/src/qt/walletview.h
@@ -50,7 +50,7 @@ public:
     void showOutOfSyncWarning(bool fShow);
 
 private:
-    ClientModel *clientModel;
+    ClientModel* clientModel{nullptr};
 
     //!
     //! The wallet model represents a bitcoin wallet, and offers access to