diff --git a/c++/cursesm.h b/c++/cursesm.h
index f8f9665..9651195 100644
--- a/c++/cursesm.h
+++ b/c++/cursesm.h
@@ -1,6 +1,7 @@
 // * This makes emacs happy -*-Mode: C++;-*-
 /****************************************************************************
- * Copyright (c) 1998-2012,2014 Free Software Foundation, Inc.              *
+ * Copyright 2019-2020,2022 Thomas E. Dickey                                *
+ * Copyright 1998-2012,2014 Free Software Foundation, Inc.                  *
  *                                                                          *
  * Permission is hereby granted, free of charge, to any person obtaining a  *
  * copy of this software and associated documentation files (the            *
@@ -31,7 +32,7 @@
  *   Author: Juergen Pfeifer, 1997                                          *
  ****************************************************************************/
 
-// $Id: cursesm.h,v 1.30 2014/08/09 22:06:18 Adam.Jiang Exp $
+// $Id: cursesm.h,v 1.35 2022/08/20 20:52:15 tom Exp $
 
 #ifndef NCURSES_CURSESM_H_incl
 #define NCURSES_CURSESM_H_incl 1
@@ -46,7 +47,7 @@
 // This wraps the ITEM type of <menu.h>
 // -------------------------------------------------------------------------
 //
-class NCURSES_IMPEXP NCursesMenuItem
+class NCURSES_CXX_IMPEXP NCursesMenuItem
 {
   friend class NCursesMenu;
 
@@ -85,7 +86,7 @@
     (void) rhs;
   }
 
-  virtual ~NCursesMenuItem ();
+  virtual ~NCursesMenuItem () THROWS(NCursesException);
   // Release the items memory
 
   inline const char* name () const {
@@ -152,7 +153,7 @@
 // If you don't like to create a child class for individual items to
 // overload action(), you may use this class and provide a callback
 // function pointer for items.
-class NCURSES_IMPEXP NCursesMenuCallbackItem : public NCursesMenuItem
+class NCURSES_CXX_IMPEXP NCursesMenuCallbackItem : public NCursesMenuItem
 {
 private:
   ITEMCALLBACK* p_fct;
@@ -179,9 +180,9 @@
   {
   }
 
-  virtual ~NCursesMenuCallbackItem();
+  virtual ~NCursesMenuCallbackItem() THROWS(NCursesException);
 
-  bool action();
+  bool action() NCURSES_OVERRIDE;
 };
 
   // This are the built-in hook functions in this C++ binding. In C++ we use
@@ -199,7 +200,7 @@
 // This wraps the MENU type of <menu.h>
 // -------------------------------------------------------------------------
 //
-class NCURSES_IMPEXP NCursesMenu : public NCursesPanel
+class NCURSES_CXX_IMPEXP NCursesMenu : public NCursesPanel
 {
 protected:
   MENU *menu;
@@ -332,7 +333,7 @@
   {
   }
 
-  virtual ~NCursesMenu ();
+  virtual ~NCursesMenu () THROWS(NCursesException);
 
   // Retrieve the menus subwindow
   inline NCursesWindow& subWindow() const {
@@ -358,7 +359,7 @@
     flag ? OnError (::post_menu(menu)) : OnError (::unpost_menu (menu));
   }
 
-  // Get the numer of rows and columns for this menu
+  // Get the number of rows and columns for this menu
   inline void scale (int& mrows, int& mcols) const  {
     OnError (::scale_menu (menu, &mrows, &mcols));
   }
@@ -511,21 +512,21 @@
   }
 
   // Decorations
-  inline void frame(const char *title=NULL, const char* btitle=NULL) {
+  inline void frame(const char *title=NULL, const char* btitle=NULL) NCURSES_OVERRIDE {
     if (b_framed)
       NCursesPanel::frame(title,btitle);
     else
       OnError(E_SYSTEM_ERROR);
   }
 
-  inline void boldframe(const char *title=NULL, const char* btitle=NULL) {
+  inline void boldframe(const char *title=NULL, const char* btitle=NULL) NCURSES_OVERRIDE {
     if (b_framed)
       NCursesPanel::boldframe(title,btitle);
     else
       OnError(E_SYSTEM_ERROR);
   }
 
-  inline void label(const char *topLabel, const char *bottomLabel) {
+  inline void label(const char *topLabel, const char *bottomLabel) NCURSES_OVERRIDE {
     if (b_framed)
       NCursesPanel::label(topLabel,bottomLabel);
     else
@@ -595,7 +596,7 @@
 // to create a UserItem.
 // -------------------------------------------------------------------------
 //
-template<class T> class NCURSES_IMPEXP NCursesUserItem : public NCursesMenuItem
+template<class T> class NCURSES_CXX_IMPEXP NCursesUserItem : public NCursesMenuItem
 {
 public:
   NCursesUserItem (const char* p_name,
@@ -606,7 +607,7 @@
 	OnError (::set_item_userptr (item, const_cast<void *>(reinterpret_cast<const void*>(p_UserData))));
   }
 
-  virtual ~NCursesUserItem() {}
+  virtual ~NCursesUserItem() THROWS(NCursesException) {}
 
   inline const T* UserData (void) const {
     return reinterpret_cast<const T*>(::item_userptr (item));
@@ -622,7 +623,7 @@
 // The same mechanism is used to attach user data to a menu
 // -------------------------------------------------------------------------
 //
-template<class T> class NCURSES_IMPEXP NCursesUserMenu : public NCursesMenu
+template<class T> class NCURSES_CXX_IMPEXP NCursesUserMenu : public NCursesMenu
 {
 protected:
   NCursesUserMenu( int  nlines,
@@ -657,7 +658,7 @@
 	set_user (const_cast<void *>(reinterpret_cast<const void*>(p_UserData)));
   };
 
-  virtual ~NCursesUserMenu() {
+  virtual ~NCursesUserMenu() THROWS(NCursesException) {
   };
 
   inline T* UserData (void) {