refactor: use C++11 default initializers

src/qt/addresstablemodel.cpp

@@ -30,7 +30,7 @@ struct AddressTableEntry
     QString label;
     QString address;
 
-    AddressTableEntry() {}
+    AddressTableEntry() = default;
     AddressTableEntry(Type _type, const QString &_label, const QString &_address):
         type(_type), label(_label), address(_address) {}
 };

src/qt/bantablemodel.cpp

@@ -89,10 +89,7 @@ BanTableModel::BanTableModel(interfaces::Node& node, QObject* parent) :
     refresh();
 }
 
-BanTableModel::~BanTableModel()
-{
-    // Intentionally left empty
-}
+BanTableModel::~BanTableModel() = default;
 
 int BanTableModel::rowCount(const QModelIndex &parent) const
 {

src/qt/notificator.cpp

@@ -71,7 +71,7 @@ Notificator::~Notificator()
 class FreedesktopImage
 {
 public:
-    FreedesktopImage() {}
+    FreedesktopImage() = default;
     explicit FreedesktopImage(const QImage &img);
 
     // Image to variant that can be marshalled over DBus

src/qt/overviewpage.cpp

@@ -35,8 +35,7 @@ class TxViewDelegate : public QAbstractItemDelegate
     Q_OBJECT
 public:
     explicit TxViewDelegate(const PlatformStyle* _platformStyle, QObject* parent = nullptr)
-        : QAbstractItemDelegate(parent), unit(BitcoinUnit::BTC),
-          platformStyle(_platformStyle)
+        : QAbstractItemDelegate(parent), platformStyle(_platformStyle)
     {
         connect(this, &TxViewDelegate::width_changed, this, &TxViewDelegate::sizeHintChanged);
     }
@@ -125,7 +124,7 @@ public:
         return {DECORATION_SIZE + 8 + minimum_text_width, DECORATION_SIZE};
     }
 
-    BitcoinUnit unit;
+    BitcoinUnit unit{BitcoinUnit::BTC};
 
 Q_SIGNALS:
     //! An intermediate signal for emitting from the `paint() const` member function.

src/qt/paymentserver.cpp

@@ -158,9 +158,7 @@ PaymentServer::PaymentServer(QObject* parent, bool startLocalServer) :
     }
 }
 
-PaymentServer::~PaymentServer()
-{
-}
+PaymentServer::~PaymentServer() = default;
 
 //
 // OSX-specific way of handling bitcoin: URIs

src/qt/peertablemodel.cpp

@@ -28,10 +28,7 @@ PeerTableModel::PeerTableModel(interfaces::Node& node, QObject* parent) :
     refresh();
 }
 
-PeerTableModel::~PeerTableModel()
-{
-    // Intentionally left empty
-}
+PeerTableModel::~PeerTableModel() = default;
 
 void PeerTableModel::startAutoRefresh()
 {

src/qt/recentrequeststablemodel.cpp

@@ -34,10 +34,7 @@ RecentRequestsTableModel::RecentRequestsTableModel(WalletModel *parent) :
     connect(walletModel->getOptionsModel(), &OptionsModel::displayUnitChanged, this, &RecentRequestsTableModel::updateDisplayUnit);
 }
 
-RecentRequestsTableModel::~RecentRequestsTableModel()
-{
-    /* Intentionally left empty */
-}
+RecentRequestsTableModel::~RecentRequestsTableModel() = default;
 
 int RecentRequestsTableModel::rowCount(const QModelIndex &parent) const
 {

src/qt/rpcconsole.cpp

@@ -120,7 +120,7 @@ public:
         connect(&timer, &QTimer::timeout, [this]{ func(); });
         timer.start(millis);
     }
-    ~QtRPCTimerBase() {}
+    ~QtRPCTimerBase() = default;
 private:
     QTimer timer;
     std::function<void()> func;
@@ -129,7 +129,7 @@ private:
 class QtRPCTimerInterface: public RPCTimerInterface
 {
 public:
-    ~QtRPCTimerInterface() {}
+    ~QtRPCTimerInterface() = default;
     const char *Name() override { return "Qt"; }
     RPCTimerBase* NewTimer(std::function<void()>& func, int64_t millis) override
     {

src/qt/transactiontablemodel.cpp

@@ -62,7 +62,7 @@ struct TxLessThan
 struct TransactionNotification
 {
 public:
-    TransactionNotification() {}
+    TransactionNotification() = default;
     TransactionNotification(uint256 _hash, ChangeType _status, bool _showTransaction):
         hash(_hash), status(_status), showTransaction(_showTransaction) {}
 

src/qt/walletframe.cpp

@@ -55,9 +55,7 @@ WalletFrame::WalletFrame(const PlatformStyle* _platformStyle, QWidget* parent)
     walletStack->addWidget(no_wallet_group);
 }
 
-WalletFrame::~WalletFrame()
-{
-}
+WalletFrame::~WalletFrame() = default;
 
 void WalletFrame::setClientModel(ClientModel *_clientModel)
 {

src/qt/walletview.cpp

@@ -111,9 +111,7 @@ WalletView::WalletView(WalletModel* wallet_model, const PlatformStyle* _platform
     connect(walletModel, &WalletModel::showProgress, this, &WalletView::showProgress);
 }
 
-WalletView::~WalletView()
-{
-}
+WalletView::~WalletView() = default;
 
 void WalletView::setClientModel(ClientModel *_clientModel)
 {