Several small code improvements

.travis.yml

@@ -100,7 +100,7 @@ matrix:
       - bash <(curl -s https://codecov.io/bash)
 
   #
-  # sonarcloud
+  # SonarCloud
   #
   - os: linux
     env:

examples/7segment.cpp

@@ -36,7 +36,7 @@ using finalcut::FSize;
 // class SegmentView
 //----------------------------------------------------------------------
 
-class SegmentView : public finalcut::FDialog
+class SegmentView final : public finalcut::FDialog
 {
   public:
     explicit SegmentView (finalcut::FWidget* = nullptr);

examples/background-color.cpp

@@ -34,7 +34,7 @@ using finalcut::FSize;
 // class Background
 //----------------------------------------------------------------------
 
-class Background : public finalcut::FDialog
+class Background final : public finalcut::FDialog
 {
   public:
     // Typedef

examples/calculator.cpp

@@ -42,7 +42,7 @@ constexpr lDouble PI{3.141592653589793238L};
 // class Button
 //----------------------------------------------------------------------
 
-class Button : public finalcut::FButton
+class Button final : public finalcut::FButton
 {
   public:
     // Constructor
@@ -106,7 +106,7 @@ void Button::onKeyPress (finalcut::FKeyEvent* ev)
 // class Calc
 //----------------------------------------------------------------------
 
-class Calc : public finalcut::FDialog
+class Calc final : public finalcut::FDialog
 {
   public:
     // Constructor

examples/checklist.cpp

@@ -36,7 +36,7 @@ using finalcut::FSize;
 // class CheckList
 //----------------------------------------------------------------------
 
-class CheckList : public finalcut::FDialog
+class CheckList final : public finalcut::FDialog
 {
   public:
     // Constructor

examples/keyboard.cpp

@@ -26,7 +26,7 @@
 // class Keyboard
 //----------------------------------------------------------------------
 
-class Keyboard : public finalcut::FWidget
+class Keyboard final : public finalcut::FWidget
 {
   public:
     // Constructor

examples/listbox.cpp

@@ -76,7 +76,7 @@ FString& mapToString ( std::map<FString
 // class Listbox
 //----------------------------------------------------------------------
 
-class Listbox : public FDialog
+class Listbox final : public FDialog
 {
   public:
     // Constructor

examples/listview.cpp

@@ -36,7 +36,7 @@ using finalcut::FSize;
 // class Listview
 //----------------------------------------------------------------------
 
-class Listview : public finalcut::FDialog
+class Listview final : public finalcut::FDialog
 {
   public:
     // Constructor

examples/mandelbrot.cpp

@@ -31,7 +31,7 @@ using finalcut::FSize;
 // class Mandelbrot
 //----------------------------------------------------------------------
 
-class Mandelbrot : public finalcut::FDialog
+class Mandelbrot final : public finalcut::FDialog
 {
   public:
     // Constructor

examples/menu.cpp

@@ -31,7 +31,7 @@ using finalcut::FSize;
 // class Menu
 //----------------------------------------------------------------------
 
-class Menu : public finalcut::FDialog
+class Menu final : public finalcut::FDialog
 {
   public:
     // Constructor

examples/mouse.cpp

@@ -33,7 +33,7 @@ using finalcut::FSize;
 // class ColorChooser
 //----------------------------------------------------------------------
 
-class ColorChooser : public finalcut::FWidget
+class ColorChooser final : public finalcut::FWidget
 {
   public:
     // Constructor
@@ -172,7 +172,7 @@ inline FColor ColorChooser::getBackground()
 // class Brushes
 //----------------------------------------------------------------------
 
-class Brushes : public finalcut::FWidget
+class Brushes final : public finalcut::FWidget
 {
   public:
     // Constructor
@@ -308,7 +308,7 @@ inline void Brushes::setBackground (FColor color)
 // class MouseDraw
 //----------------------------------------------------------------------
 
-class MouseDraw : public finalcut::FDialog
+class MouseDraw final : public finalcut::FDialog
 {
   public:
     // Using-declaration

examples/rotozoomer.cpp

@@ -42,7 +42,7 @@ using finalcut::FSize;
 // class RotoZoomer
 //----------------------------------------------------------------------
 
-class RotoZoomer : public finalcut::FDialog
+class RotoZoomer final : public finalcut::FDialog
 {
   public:
     // Constructor

examples/scrollview.cpp

@@ -31,7 +31,7 @@ using finalcut::FSize;
 // class Scrollview
 //----------------------------------------------------------------------
 
-class Scrollview : public finalcut::FScrollView
+class Scrollview final : public finalcut::FScrollView
 {
   public:
     // Constructor
@@ -190,7 +190,7 @@ void Scrollview::cb_goNorth (const finalcut::FWidget*, const FDataPtr)
 // class Scrollviewdemo
 //----------------------------------------------------------------------
 
-class Scrollviewdemo : public finalcut::FDialog
+class Scrollviewdemo final : public finalcut::FDialog
 {
   public:
     // Constructor

examples/string-operations.cpp

@@ -122,7 +122,8 @@ void streamingIntoFStringExample()
 
   // ...from wide string
   finalcut::FString streamer3;
-  streamer3 << const_cast<wchar_t*>(L"wchar_t*");
+  wchar_t* wchar_str{const_cast<wchar_t*>(L"wchar_t*")};
+  streamer3 << wchar_str;
   std::cout << " stream in: " << streamer3 << std::endl;
 
   // ...from c++ string
@@ -132,7 +133,8 @@ void streamingIntoFStringExample()
 
   // ...from c-string
   finalcut::FString streamer5;
-  streamer5 << const_cast<char*>("char*");
+  char* char_str{C_STR("char*")};
+  streamer5 << char_str;
   std::cout << " stream in: " << streamer5 << std::endl;
 
   // ...from wide character

examples/term-attributes.cpp

@@ -34,7 +34,7 @@ using finalcut::FColorPair;
 // class AttribDlg
 //----------------------------------------------------------------------
 
-class AttribDlg : public finalcut::FDialog
+class AttribDlg final : public finalcut::FDialog
 {
   public:
     // Constructor
@@ -200,7 +200,7 @@ void AttribDlg::adjustSize()
 // class AttribDemo
 //----------------------------------------------------------------------
 
-class AttribDemo : public finalcut::FWidget
+class AttribDemo final : public finalcut::FWidget
 {
   public:
     // Constructor
@@ -425,19 +425,18 @@ void AttribDemo::draw()
 
   const std::vector<std::function<void()> > effect
   {
-    [&] { printDim(); },
-    [&] { printNormal(); },
-    [&] { printBold(); },
-    [&] { printBoldDim(); },
-    [&] { printItalic(); },
-    [&] { printUnderline(); },
-    [&] { printDblUnderline(); },
-    [&] { printCrossesOut(); },
-    [&] { printBlink(); },
-    [&] { printReverse(); },
-    [&] { printStandout(); },
-    [&] { printInvisible(); },
-    [&] { printProtected(); },
+    [this] { printNormal(); },
+    [this] { printBold(); },
+    [this] { printBoldDim(); },
+    [this] { printItalic(); },
+    [this] { printUnderline(); },
+    [this] { printDblUnderline(); },
+    [this] { printCrossesOut(); },
+    [this] { printBlink(); },
+    [this] { printReverse(); },
+    [this] { printStandout(); },
+    [this] { printInvisible(); },
+    [this] { printProtected(); },
   };
 
   for (std::size_t y{0}; y < getParentWidget()->getHeight() - 7; y++)

examples/termcap.cpp

@@ -237,7 +237,9 @@ void debug (finalcut::FApplication& TermApp)
 }
 #else
 void debug (finalcut::FApplication&)
-{ }
+{
+  // FINAL CUT was compiled without debug option
+}
 #endif
 
 //----------------------------------------------------------------------

examples/timer.cpp

@@ -29,7 +29,7 @@ namespace fc = finalcut::fc;
 // class Timer
 //----------------------------------------------------------------------
 
-class Timer : public finalcut::FWidget
+class Timer final : public finalcut::FWidget
 {
   public:
     // Constructor

examples/transparent.cpp

@@ -33,7 +33,7 @@ using finalcut::FStyle;
 // class Transparent
 //----------------------------------------------------------------------
 
-class Transparent : public finalcut::FDialog
+class Transparent final : public finalcut::FDialog
 {
   public:
     // Typedef and Enumeration
@@ -74,6 +74,7 @@ Transparent::Transparent ( finalcut::FWidget* parent
   : finalcut::FDialog(parent)
   , type(tt)
 {
+  // Set statusbar text for this window
   setStatusbarMessage("Press Q to quit");
 }
 
@@ -139,7 +140,7 @@ void Transparent::onKeyPress (finalcut::FKeyEvent* ev)
 // class MainWindow
 //----------------------------------------------------------------------
 
-class MainWindow : public finalcut::FDialog
+class MainWindow final : public finalcut::FDialog
 {
   public:
     // Constructor
@@ -212,8 +213,8 @@ MainWindow::MainWindow (finalcut::FWidget* parent)
   ibg->setGeometry (FPoint(42, 3), FSize(29, 7));
   ibg->unsetTransparentShadow();
 
-  // Statusbar at the bottom
-  status_bar.setMessage("Press Q to quit");
+  // Set statusbar text for this window
+  setStatusbarMessage("Press Q to quit");
 
   unsetTransparentShadow();
   activateDialog();

examples/treeview.cpp

@@ -66,6 +66,7 @@ bool sortAscending ( const finalcut::FObject* lhs
       const sInt64 r_number = StringToNumber(r_item->getText(column));
       return bool( l_number < r_number );  // lhs < rhs
     }
+
     case 3:
     {
       std::setlocale(LC_NUMERIC, "C");
@@ -73,6 +74,9 @@ bool sortAscending ( const finalcut::FObject* lhs
       const double r_number = r_item->getText(column).toDouble();
       return bool( l_number < r_number );  // lhs < rhs
     }
+
+    default:
+      break;  // Don't do anything
   }
 
   return false;
@@ -102,6 +106,9 @@ bool sortDescending ( const finalcut::FObject* lhs
       const double r_number = r_item->getText(column).toDouble();
       return bool( l_number > r_number );  // lhs > rhs
     }
+
+    default:
+      break;  // Don't do anything
   }
 
   return false;
@@ -112,7 +119,7 @@ bool sortDescending ( const finalcut::FObject* lhs
 // class Treeview
 //----------------------------------------------------------------------
 
-class Treeview : public finalcut::FDialog
+class Treeview final : public finalcut::FDialog
 {
   public:
     // Constructor

examples/ui.cpp

@@ -38,20 +38,20 @@ using finalcut::FSize;
 // class ProgressDialog
 //----------------------------------------------------------------------
 
-class ProgressDialog : public finalcut::FDialog
+class ProgressDialog final : public finalcut::FDialog
 {
   public:
     // Constructor
     explicit ProgressDialog (finalcut::FWidget* = nullptr);
 
-    // Disable copy constructor
-    ProgressDialog (const ProgressDialog&) = delete;
+    // Copy constructor
+    ProgressDialog (const ProgressDialog&) = default;
 
     // Destructor
     ~ProgressDialog() override;
 
-    // Disable assignment operator (=)
-    ProgressDialog& operator = (const ProgressDialog&) = delete;
+    // Assignment operator (=)
+    ProgressDialog& operator = (const ProgressDialog&) = default;
 
   private:
     // Event handlers
@@ -181,7 +181,7 @@ void ProgressDialog::cb_exit_bar (const finalcut::FWidget*, const FDataPtr)
 // class TextWindow
 //----------------------------------------------------------------------
 
-class TextWindow : public finalcut::FDialog
+class TextWindow final : public finalcut::FDialog
 {
   public:
     // Constructor
@@ -247,7 +247,7 @@ void TextWindow::adjustSize()
 // class MyDialog
 //----------------------------------------------------------------------
 
-class MyDialog : public finalcut::FDialog
+class MyDialog final : public finalcut::FDialog
 {
   public:
     // Constructor

examples/watch.cpp

@@ -31,7 +31,7 @@ using finalcut::FSize;
 // class Watch
 //----------------------------------------------------------------------
 
-class Watch : public finalcut::FDialog
+class Watch final : public finalcut::FDialog
 {
   public:
     // Constructor

examples/windows.cpp

@@ -32,7 +32,7 @@ using finalcut::FSize;
 // class SmallWindow
 //----------------------------------------------------------------------
 
-class SmallWindow : public finalcut::FDialog
+class SmallWindow final : public finalcut::FDialog
 {
   public:
     // Constructor
@@ -160,20 +160,20 @@ void SmallWindow::onTimer (finalcut::FTimerEvent*)
 // class Window
 //----------------------------------------------------------------------
 
-class Window : public finalcut::FDialog
+class Window final : public finalcut::FDialog
 {
   public:
     // Constructor
     explicit Window (finalcut::FWidget* = nullptr);
 
-    // Disable copy constructor
-    Window (const Window&) = delete;
+    // Copy constructor
+    Window (const Window&) = default;
 
     // Destructor
     ~Window() override;
 
-    // Disable assignment operator (=)
-    Window& operator = (const Window&) = delete;
+    // Assignment operator (=)
+    Window& operator = (const Window&) = default;
 
   private:
     // Typedefs

src/fapplication.cpp

@@ -88,8 +88,9 @@ FApplication::FApplication ( const int& _argc
 
   if ( ! (_argc && _argv) )
   {
-    static char* empty{C_STR("")};
     app_argc = 0;
+    static char empty_str[1] = "";
+    auto empty = const_cast<char*>(empty_str);
     app_argv = static_cast<char**>(&empty);
   }
 
@@ -179,8 +180,7 @@ bool FApplication::sendEvent ( const FObject* receiver
 
   if ( receiver->isWidget() )
   {
-    const auto r_widget = static_cast<const FWidget*>(receiver);
-    auto widget = const_cast<FWidget*>(r_widget);
+    const auto widget = static_cast<const FWidget*>(receiver);
 
     if ( getModalDialogCounter() > 0 )
     {
@@ -363,7 +363,13 @@ void FApplication::closeConfirmationDialog (FWidget* w, FCloseEvent* ev)
   if ( ret == FMessageBox::Yes )
     ev->accept();
   else
+  {
     ev->ignore();
+
+    // Status bar restore after closing the FMessageBox
+    if ( getStatusBar() )
+      getStatusBar()->drawMessage();
+  }
 }
 
 // private methods of FApplication

src/fbutton.cpp

@@ -521,7 +521,9 @@ inline void FButton::drawTopBottomBackground()
 //----------------------------------------------------------------------
 inline void FButton::drawButtonTextLine (const FString& button_text)
 {
+  std::size_t z{0};
   std::size_t pos{};
+  std::size_t columns{0};
   print() << FPoint(2 + int(indent), 1 + int(vcenter_offset))
           << FColorPair (button_fg, button_bg);
 
@@ -547,8 +549,7 @@ inline void FButton::drawButtonTextLine (const FString& button_text)
   if ( active_focus && (isMonochron() || getMaxColor() < 16) )
     setBold();
 
-  for ( std::size_t z{0}, columns{0}
-      ; pos < center_offset + column_width && columns + 2 < getWidth(); )
+  while ( pos < center_offset + column_width && columns + 2 < getWidth() )
   {
     if ( z == hotkeypos && getFlags().active )
     {

src/fcombobox.cpp

@@ -538,7 +538,7 @@ void FComboBox::draw()
 {
   const auto& wc = getFWidgetColors();
 
-  const FColorPair button_color = [&] ()
+  const FColorPair button_color = [this, &wc] ()
   {
     if ( list_window.isEmpty() )
       return FColorPair ( wc.scrollbar_button_inactive_fg

src/flistview.cpp

@@ -491,8 +491,46 @@ FListViewIterator::FListViewIterator (iterator iter)
   : node(iter)
 { }
 
+//----------------------------------------------------------------------
+FListViewIterator::FListViewIterator (const FListViewIterator& i)
+  : iter_path(i.iter_path)  // copy constructor
+  , node(i.node)
+  , position(i.position)
+{ }
+
+//----------------------------------------------------------------------
+FListViewIterator::FListViewIterator (FListViewIterator&& i) noexcept
+  : iter_path(i.iter_path)  // move constructor
+  , node(i.node)
+  , position(i.position)
+{
+  i.iter_path = iterator_stack{};
+  i.node = iterator{};
+  i.position = 0;
+}
 
 // FListViewIterator operators
+//----------------------------------------------------------------------
+FListViewIterator& FListViewIterator::operator = (const FListViewIterator& i)
+{
+  iter_path = i.iter_path;
+  node = i.node;
+  position = i.position;
+  return *this;
+}
+
+//----------------------------------------------------------------------
+FListViewIterator& FListViewIterator::operator = (FListViewIterator&& i) noexcept
+{
+  iter_path = i.iter_path;
+  node = i.node;
+  position = i.position;
+  i.iter_path = iterator_stack{};
+  i.node = iterator{};
+  i.position = 0;
+  return *this;
+}
+
 //----------------------------------------------------------------------
 FListViewIterator& FListViewIterator::operator ++ ()  // prefix
 {

src/foptimove.cpp

@@ -566,8 +566,9 @@ int FOptiMove::capDuration (const char cap[], int affcnt)
     if ( p[0] == '$' && p[1] == '<' && std::strchr(p, '>') )
     {
       float num = 0;
+      p += 2;
 
-      for (p += 2; *p != '>'; p++)
+      while ( *p != '>' )
       {
         if ( std::isdigit(uChar(*p)) )
           num = num * 10 + float(*p - '0');
@@ -575,11 +576,13 @@ int FOptiMove::capDuration (const char cap[], int affcnt)
           num *= float(affcnt);
         else if ( *p == '.' )
         {
-          ++p;
+          p++;
 
           if ( *p != '>' && std::isdigit(uChar(*p)) )
             num += float((*p - '0') / 10.0);
         }
+
+        p++;
       }
 
       ms += num * 10;

src/frect.cpp

@@ -56,6 +56,28 @@ FRect::~FRect()  // destructor
 
 
 // public methods of FRect
+//----------------------------------------------------------------------
+FRect& FRect::operator = (const FRect& r)
+{
+  X1 = r.X1;
+  Y1 = r.Y1;
+  X2 = r.X2;
+  Y2 = r.Y2;
+  return *this;
+}
+
+//----------------------------------------------------------------------
+FRect& FRect::operator = (FRect&& r) noexcept
+{
+  X1 = r.X1;
+  Y1 = r.Y1;
+  X2 = r.X2;
+  Y2 = r.Y2;
+  r.X1 = r.Y1 = 0;
+  r.X2 = r.Y2 = -1;
+  return *this;
+}
+
 //----------------------------------------------------------------------
 bool FRect::isEmpty() const
 {
@@ -310,27 +332,6 @@ FRect FRect::combined (const FRect& r) const
   return new_rect;
 }
 
-//----------------------------------------------------------------------
-FRect& FRect::operator = (const FRect& r)
-{
-  X1 = r.X1;
-  Y1 = r.Y1;
-  X2 = r.X2;
-  Y2 = r.Y2;
-  return *this;
-}
-
-//----------------------------------------------------------------------
-FRect& FRect::operator = (FRect&& r) noexcept
-{
-  X1 = r.X1;
-  Y1 = r.Y1;
-  X2 = r.X2;
-  Y2 = r.Y2;
-  r.X1 = r.Y1 = 0;
-  r.X2 = r.Y2 = -1;
-  return *this;
-}
 
 // FRect non-member operators
 //----------------------------------------------------------------------

src/fwidget_functions.cpp

@@ -60,9 +60,10 @@ FKey getHotkey (const FString& text)
   if ( text.isEmpty() )
     return 0;
 
+  std::size_t i{0};
   const std::size_t length = text.getLength();
 
-  for (std::size_t i{0}; i < length; i++)
+  while ( i < length )
   {
     try
     {
@@ -76,7 +77,10 @@ FKey getHotkey (const FString& text)
     {
       return 0;
     }
+
+    i++;
   }
+
   return 0;
 }
 

src/include/final/flistview.h

@@ -190,8 +190,12 @@ class FListViewIterator
     // Constructor
     FListViewIterator ();
     FListViewIterator (iterator);
+    FListViewIterator (const FListViewIterator&);  // copy constructor
+    FListViewIterator (FListViewIterator&&) noexcept;  // move constructor
 
     // Overloaded operators
+    FListViewIterator& operator = (const FListViewIterator&);
+    FListViewIterator& operator = (FListViewIterator&&) noexcept;
     FListViewIterator& operator ++ ();     // prefix
     FListViewIterator  operator ++ (int);  // postfix
     FListViewIterator& operator -- ();     // prefix

src/include/final/fvterm.h

@@ -99,22 +99,7 @@ class FVTerm
     typedef std::function<void()> FPreprocessingFunction;
 
     struct FTermArea;  // forward declaration
-
-    struct FVTermPreprocessing
-    {
-      FVTermPreprocessing()
-        : instance(nullptr)
-        , function(nullptr)
-      { }
-
-      FVTermPreprocessing (const FVTerm* i, const FPreprocessingFunction& f)
-        : instance(i)
-        , function(f)
-      { }
-
-      const FVTerm* instance;
-      FPreprocessingFunction function;
-    };
+    struct FVTermPreprocessing; // forward declaration
 
     typedef std::vector<FVTermPreprocessing> FPreprocessing;
 
@@ -527,14 +512,17 @@ struct FVTerm::FTermArea  // define virtual terminal character properties
   public:
     // Constructor
     FTermArea() = default;
+
     // Disable copy constructor
     FTermArea (const FTermArea&) = delete;
+
     // Destructor
     ~FTermArea() = default;
 
     // Disable assignment operator (=)
     FTermArea& operator = (const FTermArea&) = delete;
 
+    // Data members
     int offset_left{0};        // Distance from left terminal side
     int offset_top{0};         // Distance from top of the terminal
     int width{-1};             // Window width
@@ -555,6 +543,63 @@ struct FVTerm::FTermArea  // define virtual terminal character properties
 };
 
 
+//----------------------------------------------------------------------
+// struct FVTerm::FVTermPreprocessing
+//----------------------------------------------------------------------
+
+struct FVTerm::FVTermPreprocessing
+{
+  // Constructor
+  FVTermPreprocessing()
+    : instance(nullptr)
+    , function(nullptr)
+  { }
+
+  FVTermPreprocessing (const FVTerm* i, const FPreprocessingFunction& f)
+    : instance(i)
+    , function(f)
+  { }
+
+  FVTermPreprocessing (const FVTermPreprocessing& p)  // copy constructor
+    : instance(p.instance)
+    , function(p.function)
+  { }
+
+  FVTermPreprocessing (FVTermPreprocessing&& p) noexcept  // move constructor
+    : instance(p.instance)
+    , function(p.function)
+  {
+    p.instance = nullptr;
+    p.function = nullptr;
+  }
+
+  // Overloaded operators
+  FVTermPreprocessing& operator = (const FVTermPreprocessing& p)
+  {
+    instance = p.instance;
+    function = p.function;
+    return *this;
+  }
+
+  FVTermPreprocessing& operator = (FVTermPreprocessing&& p) noexcept
+  {
+    instance = p.instance;
+    function = p.function;
+    p.instance = nullptr;
+    p.function = nullptr;
+    return *this;
+  }
+
+  // Destructor
+  ~FVTermPreprocessing()
+  { }
+
+  // Data members
+  const FVTerm* instance{};
+  FPreprocessingFunction function{};
+};
+
+
 // FVTerm inline functions
 //----------------------------------------------------------------------
 template <typename typeT>

src/include/final/fwidget.h

@@ -340,27 +340,7 @@ class FWidget : public FVTerm, public FObject
     static void             quit();
 
   protected:
-    struct FCallbackData
-    {
-      FCallbackData()
-        : cb_signal()
-        , cb_instance(nullptr)
-        , cb_function()
-        , data(nullptr)
-      { }
-
-      FCallbackData (FString s, FWidget* i, FCallback c, FDataPtr d)
-        : cb_signal(s)
-        , cb_instance(i)
-        , cb_function(c)
-        , data(d)
-      { }
-
-      FString   cb_signal;
-      FWidget*  cb_instance;
-      FCallback cb_function;
-      FDataPtr  data;
-    };
+    struct FCallbackData;  // forward declaration
 
     // Typedefs
     typedef std::vector<FCallbackData> FCallbackObjects;
@@ -537,6 +517,79 @@ class FWidget : public FVTerm, public FObject
     friend void clearFlatBorder (FWidget*);
 };
 
+//----------------------------------------------------------------------
+// struct FWidget::FCallbackData
+//----------------------------------------------------------------------
+struct FWidget::FCallbackData
+{
+  // Constructor
+  FCallbackData()
+    : cb_signal()
+    , cb_instance(nullptr)
+    , cb_function()
+    , data(nullptr)
+  { }
+
+  FCallbackData (FString s, FWidget* i, FCallback c, FDataPtr d)
+    : cb_signal(s)
+    , cb_instance(i)
+    , cb_function(c)
+    , data(d)
+  { }
+
+  FCallbackData (const FCallbackData& c)  // copy constructor
+    : cb_signal(c.cb_signal)
+    , cb_instance(c.cb_instance)
+    , cb_function(c.cb_function)
+    , data(c.data)
+  { }
+
+  FCallbackData (FCallbackData&& c) noexcept  // move constructor
+    : cb_signal(c.cb_signal)
+    , cb_instance(c.cb_instance)
+    , cb_function(c.cb_function)
+    , data(c.data)
+  {
+    c.cb_signal.clear();
+    c.cb_instance = nullptr;
+    c.cb_function = nullptr;
+    c.data = nullptr;
+  }
+
+  // Destructor
+  ~FCallbackData()
+  { }
+
+  // Overloaded operators
+  FCallbackData& operator = (const FCallbackData& c)
+  {
+    cb_signal = c.cb_signal;
+    cb_instance = c.cb_instance;
+    cb_function = c.cb_function;
+    data = c.data;
+    return *this;
+  }
+
+  FCallbackData& operator = (FCallbackData&& c) noexcept
+  {
+    cb_signal = c.cb_signal;
+    cb_instance = c.cb_instance;
+    cb_function = c.cb_function;
+    data = c.data;
+    c.cb_signal.clear();
+    c.cb_instance = nullptr;
+    c.cb_function = nullptr;
+    c.data = nullptr;
+    return *this;
+  }
+
+  // Data members
+  FString   cb_signal{};
+  FWidget*  cb_instance{};
+  FCallback cb_function{};
+  FDataPtr  data{};
+};
+
 
 // non-member function forward declarations
 // implemented in fwidget_functions.cpp

src/include/final/sgr_optimizer.h

@@ -56,12 +56,12 @@ class SGRoptimizer final
     // Constructors
     explicit SGRoptimizer (attributebuffer&);
 
-    // Destructor
-    ~SGRoptimizer();
-
     // Disable copy constructor
     SGRoptimizer (const SGRoptimizer&) = delete;
 
+    // Destructor
+    ~SGRoptimizer();
+
     // Disable assignment operator (=)
     SGRoptimizer& operator = (const SGRoptimizer&) = delete;