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 // * This makes emacs happy -*-Mode: C++;-*-
 // vile:cppmode
 /****************************************************************************
  * Copyright 2019-2021,2022 Thomas E. Dickey                                *
  * Copyright 1998-2012,2014 Free Software Foundation, Inc.                  *
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  * copy of this software and associated documentation files (the            *
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  * distribute, distribute with modifications, sublicense, and/or sell       *
  * copies of the Software, and to permit persons to whom the Software is    *
  * furnished to do so, subject to the following conditions:                 *
  *                                                                          *
  * The above copyright notice and this permission notice shall be included  *
  * in all copies or substantial portions of the Software.                   *
  *                                                                          *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
  *                                                                          *
  * Except as contained in this notice, the name(s) of the above copyright   *
  * holders shall not be used in advertising or otherwise to promote the     *
  * sale, use or other dealings in this Software without prior written       *
  * authorization.                                                           *
  ****************************************************************************/
 
 /****************************************************************************
  *   Author: Juergen Pfeifer, 1997                                          *
  ****************************************************************************/
 
 // $Id: cursesf.h,v 1.39 2022/08/20 20:52:15 tom Exp $
 
 #ifndef NCURSES_CURSESF_H_incl
 #define NCURSES_CURSESF_H_incl 1
 
 #include <ncursesw/cursesp.h>
 
 #ifndef __EXT_QNX
 #include <string.h>
 #endif
 
 extern "C" {
 #  include <ncursesw/form.h>
 }
 //
 // -------------------------------------------------------------------------
 // The abstract base class for builtin and user defined Fieldtypes.
 // -------------------------------------------------------------------------
 //
 class NCURSES_CXX_IMPEXP NCursesFormField; // forward declaration
 
 // Class to represent builtin field types as well as C++ written new
 // fieldtypes (see classes UserDefineFieldType...
 class NCURSES_CXX_IMPEXP NCursesFieldType
 {
   friend class NCursesFormField;
 
 protected:
   FIELDTYPE* fieldtype;
 
   inline void OnError(int err) const THROW2(NCursesException const, NCursesFormException) {
     if (err!=E_OK)
       THROW(new NCursesFormException (err));
   }
 
   NCursesFieldType(FIELDTYPE *f) : fieldtype(f) {
   }
 
   virtual ~NCursesFieldType() {}
 
   // Set the fields f fieldtype to this one.
   virtual void set(NCursesFormField& f) = 0;
 
 public:
   NCursesFieldType()
     : fieldtype(STATIC_CAST(FIELDTYPE*)(0))
   {
   }
 
   NCursesFieldType& operator=(const NCursesFieldType& rhs)
   {
     if (this != &rhs) {
       *this = rhs;
     }
     return *this;
   }
 
   NCursesFieldType(const NCursesFieldType& rhs)
     : fieldtype(rhs.fieldtype)
   {
   }
 
 };
 
 //
 // -------------------------------------------------------------------------
 // The class representing a forms field, wrapping the lowlevel FIELD struct
 // -------------------------------------------------------------------------
 //
 class NCURSES_CXX_IMPEXP NCursesFormField
 {
   friend class NCursesForm;
 
 protected:
   FIELD *field;          // lowlevel structure
   NCursesFieldType* ftype;   // Associated field type
 
   // Error handler
   inline void OnError (int err) const THROW2(NCursesException const, NCursesFormException) {
     if (err != E_OK)
       THROW(new NCursesFormException (err));
   }
 
 public:
   // Create a 'Null' field. Can be used to delimit a field list
   NCursesFormField()
     : field(STATIC_CAST(FIELD*)(0)),
       ftype(STATIC_CAST(NCursesFieldType*)(0))
   {
   }
 
   // Create a new field
   NCursesFormField (int rows,
             int ncols,
             int first_row = 0,
             int first_col = 0,
             int offscreen_rows = 0,
             int additional_buffers = 0)
     : field(0),
       ftype(STATIC_CAST(NCursesFieldType*)(0))
   {
       field = ::new_field(rows, ncols, first_row, first_col,
               offscreen_rows, additional_buffers);
       if (!field)
     OnError(errno);
   }
 
   NCursesFormField& operator=(const NCursesFormField& rhs)
   {
     if (this != &rhs) {
       *this = rhs;
     }
     return *this;
   }
 
   NCursesFormField(const NCursesFormField& rhs)
     : field(rhs.field), ftype(rhs.ftype)
   {
   }
 
   virtual ~NCursesFormField () THROWS(NCursesException);
 
   // Duplicate the field at a new position
   inline NCursesFormField* dup(int first_row, int first_col)
   {
     NCursesFormField* f = new NCursesFormField();
     if (!f)
       OnError(E_SYSTEM_ERROR);
     else {
       f->ftype = ftype;
       f->field = ::dup_field(field,first_row,first_col);
       if (!f->field)
     OnError(errno);
     }
     return f;
   }
 
   // Link the field to a new location
   inline NCursesFormField* link(int first_row, int first_col) {
     NCursesFormField* f = new NCursesFormField();
     if (!f)
       OnError(E_SYSTEM_ERROR);
     else {
       f->ftype = ftype;
       f->field = ::link_field(field,first_row,first_col);
       if (!f->field)
     OnError(errno);
     }
     return f;
   }
 
   // Get the lowlevel field representation
   inline FIELD* get_field() const {
     return field;
   }
 
   // Retrieve info about the field
   inline void info(int& rows, int& ncols,
            int& first_row, int& first_col,
            int& offscreen_rows, int& additional_buffers) const {
     OnError(::field_info(field, &rows, &ncols,
              &first_row, &first_col,
              &offscreen_rows, &additional_buffers));
   }
 
   // Retrieve info about the fields dynamic properties.
   inline void dynamic_info(int& dynamic_rows, int& dynamic_cols,
                int& max_growth) const {
     OnError(::dynamic_field_info(field, &dynamic_rows, &dynamic_cols,
                  &max_growth));
   }
 
   // For a dynamic field you may set the maximum growth limit.
   // A zero means unlimited growth.
   inline void set_maximum_growth(int growth = 0) {
     OnError(::set_max_field(field,growth));
   }
 
   // Move the field to a new position
   inline void move(int row, int col) {
     OnError(::move_field(field,row,col));
   }
 
   // Mark the field to start a new page
   inline void new_page(bool pageFlag = FALSE) {
     OnError(::set_new_page(field,pageFlag));
   }
 
   // Retrieve whether or not the field starts a new page.
   inline bool is_new_page() const {
     return ::new_page(field);
   }
 
   // Set the justification for the field
   inline void set_justification(int just) {
     OnError(::set_field_just(field,just));
   }
 
   // Retrieve the fields justification
   inline int justification() const {
     return ::field_just(field);
   }
   // Set the foreground attribute for the field
   inline void set_foreground(chtype foreground) {
     OnError(::set_field_fore(field,foreground));
   }
 
   // Retrieve the fields foreground attribute
   inline chtype fore() const {
     return ::field_fore(field);
   }
 
   // Set the background attribute for the field
   inline void set_background(chtype background) {
     OnError(::set_field_back(field,background));
   }
 
   // Retrieve the fields background attribute
   inline chtype back() const {
     return ::field_back(field);
   }
 
   // Set the padding character for the field
   inline void set_pad_character(int padding) {
     OnError(::set_field_pad(field, padding));
   }
 
   // Retrieve the fields padding character
   inline int pad() const {
     return ::field_pad(field);
   }
 
   // Switch on the fields options
   inline void options_on (Field_Options opts) {
     OnError (::field_opts_on (field, opts));
   }
 
   // Switch off the fields options
   inline void options_off (Field_Options opts) {
     OnError (::field_opts_off (field, opts));
   }
 
   // Retrieve the fields options
   inline Field_Options options () const {
     return ::field_opts (field);
   }
 
   // Set the fields options
   inline void set_options (Field_Options opts) {
     OnError (::set_field_opts (field, opts));
   }
 
   // Mark the field as changed
   inline void set_changed(bool changeFlag = TRUE) {
     OnError(::set_field_status(field,changeFlag));
   }
 
   // Test whether or not the field is marked as changed
   inline bool changed() const {
     return ::field_status(field);
   }
 
   // Return the index of the field in the field array of a form
   // or -1 if the field is not associated to a form
   inline int (index)() const {
     return ::field_index(field);
   }
 
   // Store a value in a fields buffer. The default buffer is nr. 0
   inline void set_value(const char *val, int buffer = 0) {
     OnError(::set_field_buffer(field,buffer,val));
   }
 
   // Retrieve the value of a fields buffer. The default buffer is nr. 0
   inline char* value(int buffer = 0) const {
     return ::field_buffer(field,buffer);
   }
 
   // Set the validation type of the field.
   inline void set_fieldtype(NCursesFieldType& f) {
     ftype = &f;
     f.set(*this); // A good friend may do that...
   }
 
   // Retrieve the validation type of the field.
   inline NCursesFieldType* fieldtype() const {
     return ftype;
   }
 
 };
 
   // This are the built-in hook functions in this C++ binding. In C++ we use
   // virtual member functions (see below On_..._Init and On_..._Termination)
   // to provide this functionality in an object oriented manner.
 extern "C" {
   void _nc_xx_frm_init(FORM *);
   void _nc_xx_frm_term(FORM *);
   void _nc_xx_fld_init(FORM *);
   void _nc_xx_fld_term(FORM *);
 }
 
 //
 // -------------------------------------------------------------------------
 // The class representing a form, wrapping the lowlevel FORM struct
 // -------------------------------------------------------------------------
 //
 class NCURSES_CXX_IMPEXP NCursesForm : public NCursesPanel
 {
 protected:
   FORM* form;  // the lowlevel structure
 
 private:
   NCursesWindow* sub;   // the subwindow object
   bool b_sub_owner;     // is this our own subwindow?
   bool b_framed;    // has the form a border?
   bool b_autoDelete;    // Delete fields when deleting form?
 
   NCursesFormField** my_fields; // The array of fields for this form
 
   // This structure is used for the form's user data field to link the
   // FORM* to the C++ object and to provide extra space for a user pointer.
   typedef struct {
     void*          m_user;      // the pointer for the user's data
     const NCursesForm* m_back;      // backward pointer to C++ object
     const FORM*        m_owner;
   } UserHook;
 
   // Get the backward pointer to the C++ object from a FORM
   static inline NCursesForm* getHook(const FORM *f) {
     UserHook* hook = reinterpret_cast<UserHook*>(::form_userptr(f));
     assert(hook != 0 && hook->m_owner==f);
     return const_cast<NCursesForm*>(hook->m_back);
   }
 
   friend void _nc_xx_frm_init(FORM *);
   friend void _nc_xx_frm_term(FORM *);
   friend void _nc_xx_fld_init(FORM *);
   friend void _nc_xx_fld_term(FORM *);
 
   // Calculate FIELD* array for the menu
   FIELD** mapFields(NCursesFormField* nfields[]);
 
 protected:
   // internal routines
   inline void set_user(void *user) {
     UserHook* uptr = reinterpret_cast<UserHook*>(::form_userptr (form));
     assert (uptr != 0 && uptr->m_back==this && uptr->m_owner==form);
     uptr->m_user = user;
   }
 
   inline void *get_user() {
     UserHook* uptr = reinterpret_cast<UserHook*>(::form_userptr (form));
     assert (uptr != 0 && uptr->m_back==this && uptr->m_owner==form);
     return uptr->m_user;
   }
 
   void InitForm (NCursesFormField* Fields[],
          bool with_frame,
          bool autoDeleteFields);
 
   inline void OnError (int err) const THROW2(NCursesException const, NCursesFormException) {
     if (err != E_OK)
       THROW(new NCursesFormException (err));
   }
 
   // this wraps the form_driver call.
   virtual int driver (int c) ;
 
   // 'Internal' constructor, builds an object without association to a
   // field array.
   NCursesForm( int  nlines,
            int  ncols,
            int  begin_y = 0,
            int  begin_x = 0)
     : NCursesPanel(nlines, ncols, begin_y, begin_x),
       form (STATIC_CAST(FORM*)(0)),
       sub(0),
       b_sub_owner(0),
       b_framed(0),
       b_autoDelete(0),
       my_fields(0)
   {
   }
 
 public:
   // Create form for the default panel.
   NCursesForm (NCursesFormField* Fields[],
            bool with_frame=FALSE,         // reserve space for a frame?
            bool autoDelete_Fields=FALSE)  // do automatic cleanup?
     : NCursesPanel(),
       form(0),
       sub(0),
       b_sub_owner(0),
       b_framed(0),
       b_autoDelete(0),
       my_fields(0)
   {
     InitForm(Fields, with_frame, autoDelete_Fields);
   }
 
   // Create a form in a panel with the given position and size.
   NCursesForm (NCursesFormField* Fields[],
            int  nlines,
            int  ncols,
            int  begin_y,
            int  begin_x,
            bool with_frame=FALSE,        // reserve space for a frame?
            bool autoDelete_Fields=FALSE) // do automatic cleanup?
     : NCursesPanel(nlines, ncols, begin_y, begin_x),
       form(0),
       sub(0),
       b_sub_owner(0),
       b_framed(0),
       b_autoDelete(0),
       my_fields(0)
   {
       InitForm(Fields, with_frame, autoDelete_Fields);
   }
 
   NCursesForm& operator=(const NCursesForm& rhs)
   {
     if (this != &rhs) {
       *this = rhs;
       NCursesPanel::operator=(rhs);
     }
     return *this;
   }
 
   NCursesForm(const NCursesForm& rhs)
     : NCursesPanel(rhs),
       form(rhs.form),
       sub(rhs.sub),
       b_sub_owner(rhs.b_sub_owner),
       b_framed(rhs.b_framed),
       b_autoDelete(rhs.b_autoDelete),
       my_fields(rhs.my_fields)
   {
   }
 
   virtual ~NCursesForm() THROWS(NCursesException);
 
   // Set the default attributes for the form
   virtual void setDefaultAttributes();
 
   // Retrieve current field of the form.
   inline NCursesFormField* current_field() const {
     return my_fields[::field_index(::current_field(form))];
   }
 
   // Set the forms subwindow
   void setSubWindow(NCursesWindow& sub);
 
   // Set these fields for the form
   inline void setFields(NCursesFormField* Fields[]) {
     OnError(::set_form_fields(form,mapFields(Fields)));
   }
 
   // Remove the form from the screen
   inline void unpost (void) {
     OnError (::unpost_form (form));
   }
 
   // Post the form to the screen if flag is true, unpost it otherwise
   inline void post(bool flag = TRUE) {
     OnError (flag ? ::post_form(form) : ::unpost_form (form));
   }
 
   // Decorations
   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) NCURSES_OVERRIDE {
     if (b_framed)
       NCursesPanel::boldframe(title,btitle);
     else
       OnError(E_SYSTEM_ERROR);
   }
 
   inline void label(const char *topLabel, const char *bottomLabel) NCURSES_OVERRIDE {
     if (b_framed)
       NCursesPanel::label(topLabel,bottomLabel);
     else
       OnError(E_SYSTEM_ERROR);
   }
 
   // -----
   // Hooks
   // -----
 
   // Called after the form gets repositioned in its window.
   // This is especially true if the form is posted.
   virtual void On_Form_Init();
 
   // Called before the form gets repositioned in its window.
   // This is especially true if the form is unposted.
   virtual void On_Form_Termination();
 
   // Called after the field became the current field
   virtual void On_Field_Init(NCursesFormField& field);
 
   // Called before this field is left as current field.
   virtual void On_Field_Termination(NCursesFormField& field);
 
   // Calculate required window size for the form.
   void scale(int& rows, int& ncols) const {
     OnError(::scale_form(form,&rows,&ncols));
   }
 
   // Retrieve number of fields in the form.
   int count() const {
     return ::field_count(form);
   }
 
   // Make the page the current page of the form.
   void set_page(int pageNum) {
     OnError(::set_form_page(form, pageNum));
   }
 
   // Retrieve current page number
   int page() const {
     return ::form_page(form);
   }
 
   // Switch on the forms options
   inline void options_on (Form_Options opts) {
     OnError (::form_opts_on (form, opts));
   }
 
   // Switch off the forms options
   inline void options_off (Form_Options opts) {
     OnError (::form_opts_off (form, opts));
   }
 
   // Retrieve the forms options
   inline Form_Options options () const {
     return ::form_opts (form);
   }
 
   // Set the forms options
   inline void set_options (Form_Options opts) {
     OnError (::set_form_opts (form, opts));
   }
 
   // Are there more data in the current field after the data shown
   inline bool data_ahead() const {
     return ::data_ahead(form);
   }
 
   // Are there more data in the current field before the data shown
   inline bool data_behind() const {
     return ::data_behind(form);
   }
 
   // Position the cursor to the current field
   inline void position_cursor () {
     OnError (::pos_form_cursor (form));
   }
   // Set the current field
   inline void set_current(NCursesFormField& F) {
     OnError (::set_current_field(form, F.field));
   }
 
   // Provide a default key virtualization. Translate the keyboard
   // code c into a form request code.
   // The default implementation provides a hopefully straightforward
   // mapping for the most common keystrokes and form requests.
   virtual int virtualize(int c);
 
   // Operators
   inline NCursesFormField* operator[](int i) const {
     if ( (i < 0) || (i >= ::field_count (form)) )
       OnError (E_BAD_ARGUMENT);
     return my_fields[i];
   }
 
   // Perform the menu's operation
   // Return the field where you left the form.
   virtual NCursesFormField* operator()(void);
 
   // Exception handlers. The default is a Beep.
   virtual void On_Request_Denied(int c) const;
   virtual void On_Invalid_Field(int c) const;
   virtual void On_Unknown_Command(int c) const;
 
 };
 
 //
 // -------------------------------------------------------------------------
 // This is the typical C++ typesafe way to allow to attach
 // user data to a field of a form. Its assumed that the user
 // data belongs to some class T. Use T as template argument
 // to create a UserField.
 // -------------------------------------------------------------------------
 template<class T> class NCURSES_CXX_IMPEXP NCursesUserField : public NCursesFormField
 {
 public:
   NCursesUserField (int rows,
             int ncols,
             int first_row = 0,
             int first_col = 0,
             const T* p_UserData = STATIC_CAST(T*)(0),
             int offscreen_rows = 0,
             int additional_buffers = 0)
     : NCursesFormField (rows, ncols,
             first_row, first_col,
             offscreen_rows, additional_buffers) {
       if (field)
     OnError(::set_field_userptr(field, STATIC_CAST(void *)(p_UserData)));
   }
 
   virtual ~NCursesUserField() THROWS(NCursesException) {};
 
   inline const T* UserData (void) const {
     return reinterpret_cast<const T*>(::field_userptr (field));
   }
 
   inline virtual void setUserData(const T* p_UserData) {
     if (field)
       OnError (::set_field_userptr (field, STATIC_CAST(void *)(p_UserData)));
   }
 };
 //
 // -------------------------------------------------------------------------
 // The same mechanism is used to attach user data to a form
 // -------------------------------------------------------------------------
 //
 template<class T> class NCURSES_CXX_IMPEXP NCursesUserForm : public NCursesForm
 {
 protected:
   // 'Internal' constructor, builds an object without association to a
   // field array.
   NCursesUserForm( int  nlines,
            int  ncols,
            int  begin_y = 0,
            int  begin_x = 0,
            const T* p_UserData = STATIC_CAST(T*)(0))
     : NCursesForm(nlines,ncols,begin_y,begin_x) {
       if (form)
     set_user (const_cast<void *>(reinterpret_cast<const void*>
                      (p_UserData)));
   }
 
 public:
   NCursesUserForm (NCursesFormField* Fields[],
            const T* p_UserData = STATIC_CAST(T*)(0),
            bool with_frame=FALSE,
            bool autoDelete_Fields=FALSE)
     : NCursesForm (Fields, with_frame, autoDelete_Fields) {
       if (form)
     set_user (const_cast<void *>(reinterpret_cast<const void*>(p_UserData)));
   };
 
   NCursesUserForm (NCursesFormField* Fields[],
            int nlines,
            int ncols,
            int begin_y = 0,
            int begin_x = 0,
            const T* p_UserData = STATIC_CAST(T*)(0),
            bool with_frame=FALSE,
            bool autoDelete_Fields=FALSE)
     : NCursesForm (Fields, nlines, ncols, begin_y, begin_x,
            with_frame, autoDelete_Fields) {
       if (form)
     set_user (const_cast<void *>(reinterpret_cast<const void*>
                      (p_UserData)));
   };
 
   virtual ~NCursesUserForm() THROWS(NCursesException) {
   };
 
   inline T* UserData (void) {
     return reinterpret_cast<T*>(get_user ());
   };
 
   inline virtual void setUserData (const T* p_UserData) {
     if (form)
       set_user (const_cast<void *>(reinterpret_cast<const void*>(p_UserData)));
   }
 
 };
 //
 // -------------------------------------------------------------------------
 // Builtin Fieldtypes
 // -------------------------------------------------------------------------
 //
 class NCURSES_CXX_IMPEXP Alpha_Field : public NCursesFieldType
 {
 private:
   int min_field_width;
 
   void set(NCursesFormField& f) NCURSES_OVERRIDE {
     OnError(::set_field_type(f.get_field(),fieldtype,min_field_width));
   }
 
 public:
   explicit Alpha_Field(int width)
     : NCursesFieldType(TYPE_ALPHA),
       min_field_width(width) {
   }
 };
 
 class NCURSES_CXX_IMPEXP Alphanumeric_Field : public NCursesFieldType
 {
 private:
   int min_field_width;
 
   void set(NCursesFormField& f) NCURSES_OVERRIDE {
     OnError(::set_field_type(f.get_field(),fieldtype,min_field_width));
   }
 
 public:
   explicit Alphanumeric_Field(int width)
     : NCursesFieldType(TYPE_ALNUM),
       min_field_width(width) {
   }
 };
 
 class NCURSES_CXX_IMPEXP Integer_Field : public NCursesFieldType
 {
 private:
   int precision;
   long lower_limit, upper_limit;
 
   void set(NCursesFormField& f) NCURSES_OVERRIDE {
     OnError(::set_field_type(f.get_field(),fieldtype,
                  precision,lower_limit,upper_limit));
   }
 
 public:
   Integer_Field(int prec, long low=0L, long high=0L)
     : NCursesFieldType(TYPE_INTEGER),
       precision(prec), lower_limit(low), upper_limit(high) {
   }
 };
 
 class NCURSES_CXX_IMPEXP Numeric_Field : public NCursesFieldType
 {
 private:
   int precision;
   double lower_limit, upper_limit;
 
   void set(NCursesFormField& f) NCURSES_OVERRIDE {
     OnError(::set_field_type(f.get_field(),fieldtype,
                  precision,lower_limit,upper_limit));
   }
 
 public:
   Numeric_Field(int prec, double low=0.0, double high=0.0)
     : NCursesFieldType(TYPE_NUMERIC),
       precision(prec), lower_limit(low), upper_limit(high) {
   }
 };
 
 class NCURSES_CXX_IMPEXP Regular_Expression_Field : public NCursesFieldType
 {
 private:
   char* regex;
 
   void set(NCursesFormField& f) NCURSES_OVERRIDE {
     OnError(::set_field_type(f.get_field(),fieldtype,regex));
   }
 
   void copy_regex(const char *source)
   {
     regex = new char[1 + ::strlen(source)];
     (::strcpy)(regex, source);
   }
 
 public:
   explicit Regular_Expression_Field(const char *expr)
     : NCursesFieldType(TYPE_REGEXP),
       regex(NULL)
   {
     copy_regex(expr);
   }
 
   Regular_Expression_Field& operator=(const Regular_Expression_Field& rhs)
   {
     if (this != &rhs) {
       *this = rhs;
       copy_regex(rhs.regex);
       NCursesFieldType::operator=(rhs);
     }
     return *this;
   }
 
   Regular_Expression_Field(const Regular_Expression_Field& rhs)
     : NCursesFieldType(rhs),
       regex(NULL)
   {
     copy_regex(rhs.regex);
   }
 
   ~Regular_Expression_Field() {
     delete[] regex;
   }
 };
 
 class NCURSES_CXX_IMPEXP Enumeration_Field : public NCursesFieldType
 {
 private:
   const char** list;
   int case_sensitive;
   int non_unique_matches;
 
   void set(NCursesFormField& f) NCURSES_OVERRIDE {
     OnError(::set_field_type(f.get_field(),fieldtype,
                  list,case_sensitive,non_unique_matches));
   }
 public:
   Enumeration_Field(const char* enums[],
             bool case_sens=FALSE,
             bool non_unique=FALSE)
     : NCursesFieldType(TYPE_ENUM),
       list(enums),
       case_sensitive(case_sens ? -1 : 0),
       non_unique_matches(non_unique ? -1 : 0) {
   }
 
   Enumeration_Field& operator=(const Enumeration_Field& rhs)
   {
     if (this != &rhs) {
       *this = rhs;
       NCursesFieldType::operator=(rhs);
     }
     return *this;
   }
 
   Enumeration_Field(const Enumeration_Field& rhs)
     : NCursesFieldType(rhs),
       list(rhs.list),
       case_sensitive(rhs.case_sensitive),
       non_unique_matches(rhs.non_unique_matches)
   {
   }
 };
 
 class NCURSES_CXX_IMPEXP IPV4_Address_Field : public NCursesFieldType
 {
 private:
   void set(NCursesFormField& f) NCURSES_OVERRIDE {
     OnError(::set_field_type(f.get_field(),fieldtype));
   }
 
 public:
   IPV4_Address_Field() : NCursesFieldType(TYPE_IPV4) {
   }
 };
 
 extern "C" {
   bool _nc_xx_fld_fcheck(FIELD *, const void*);
   bool _nc_xx_fld_ccheck(int c, const void *);
   void* _nc_xx_fld_makearg(va_list*);
 }
 
 //
 // -------------------------------------------------------------------------
 // Abstract base class for User-Defined Fieldtypes
 // -------------------------------------------------------------------------
 //
 class NCURSES_CXX_IMPEXP UserDefinedFieldType : public NCursesFieldType
 {
   friend class UDF_Init; // Internal helper to set up statics
 private:
   // For all C++ defined fieldtypes we need only one generic lowlevel
   // FIELDTYPE* element.
   static FIELDTYPE* generic_fieldtype;
 
 protected:
   // This are the functions required by the low level libforms functions
   // to construct a fieldtype.
   friend bool _nc_xx_fld_fcheck(FIELD *, const void*);
   friend bool _nc_xx_fld_ccheck(int c, const void *);
   friend void* _nc_xx_fld_makearg(va_list*);
 
   void set(NCursesFormField& f) NCURSES_OVERRIDE {
     OnError(::set_field_type(f.get_field(),fieldtype,&f));
   }
 
 protected:
   // Redefine this function to do a field validation. The argument
   // is a reference to the field you should validate.
   virtual bool field_check(NCursesFormField& f) = 0;
 
   // Redefine this function to do a character validation. The argument
   // is the character to be validated.
   virtual bool char_check (int c) = 0;
 
 public:
   UserDefinedFieldType();
 };
 
 extern "C" {
   bool _nc_xx_next_choice(FIELD*, const void *);
   bool _nc_xx_prev_choice(FIELD*, const void *);
 }
 
 //
 // -------------------------------------------------------------------------
 // Abstract base class for User-Defined Fieldtypes with Choice functions
 // -------------------------------------------------------------------------
 //
 class NCURSES_CXX_IMPEXP UserDefinedFieldType_With_Choice : public UserDefinedFieldType
 {
   friend class UDF_Init; // Internal helper to set up statics
 private:
   // For all C++ defined fieldtypes with choice functions we need only one
   // generic lowlevel FIELDTYPE* element.
   static FIELDTYPE* generic_fieldtype_with_choice;
 
   // This are the functions required by the low level libforms functions
   // to construct a fieldtype with choice functions.
   friend bool _nc_xx_next_choice(FIELD*, const void *);
   friend bool _nc_xx_prev_choice(FIELD*, const void *);
 
 protected:
   // Redefine this function to do the retrieval of the next choice value.
   // The argument is a reference to the field tobe examined.
   virtual bool next    (NCursesFormField& f) = 0;
 
   // Redefine this function to do the retrieval of the previous choice value.
   // The argument is a reference to the field tobe examined.
   virtual bool previous(NCursesFormField& f) = 0;
 
 public:
   UserDefinedFieldType_With_Choice();
 };
 
 #endif /* NCURSES_CURSESF_H_incl */

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