# curs_opaque 3x 2023-12-16 ncurses 6.4 Library calls

    curs_opaque(3x)                  Library calls                 curs_opaque(3x)

## NAME

           is_cleared,  is_idlok,  is_idcok,  is_immedok,  is_keypad,  is_leaveok,
           is_nodelay, is_notimeout, is_pad,  is_scrollok,  is_subwin,  is_syncok,
           wgetdelay, wgetparent, wgetscrreg - obtain curses window properties

## SYNOPSIS

           #include <curses.h>

           bool is_cleared(const WINDOW *win);
           bool is_idcok(const WINDOW *win);
           bool is_idlok(const WINDOW *win);
           bool is_immedok(const WINDOW *win);
           bool is_keypad(const WINDOW *win);
           bool is_leaveok(const WINDOW *win);
           bool is_nodelay(const WINDOW *win);
           bool is_notimeout(const WINDOW *win);
           bool is_pad(const WINDOW *win);
           bool is_scrollok(const WINDOW *win);
           bool is_subwin(const WINDOW *win);
           bool is_syncok(const WINDOW *win);

           WINDOW * wgetparent(const WINDOW *win);
           int wgetdelay(const WINDOW *win);
           int wgetscrreg(const WINDOW *win, int *top, int *bottom);

## DESCRIPTION

           ncurses  provides functions returning properties of a WINDOW structure,
           allowing  it  to  be  "opaque"   if   the   application   defines   the
           NCURSES_OPAQUE  preprocessor  symbol.  Opacity in this sense means that
           the members of struct data  types  are  not  directly  accessible  (for
           instance,  through  "." or "->" operators), but instead must be queried
           and/or set  via  library  functions.   Advantages  of  opacity  include
           greater  abstraction  and improved management of concurrent accesses to
           data structures, keeping object states coherent.

           is_cleared
                  returns the value set by clearok(3x).

           is_idcok
                  returns the value set by idcok(3x).

           is_idlok
                  returns the value set by idlok(3x).

           is_immedok
                  returns the value set by immedok(3x).

           is_keypad
                  returns the value set by keypad(3x).

           is_leaveok
                  returns the value set by leaveok(3x).

           is_nodelay
                  returns the value set by nodelay(3x).

           is_notimeout
                  returns the value set by notimeout(3x).

           is_pad returns TRUE if the window is a pad; that is, it was created  by
                  newpad(3x).

           is_scrollok
                  returns the value set by scrollok(3x).

           is_subwin
                  returns  TRUE  if  the  window  is  a subwindow, that is, it was
                  created by subwin(3x) or derwin(3x).

           is_syncok
                  returns the value set by syncok(3x).

           wgetdelay
                  returns the delay timeout set by wtimeout(3x).

           wgetparent
                  returns the parent WINDOW pointer for subwindows,  or  NULL  for
                  windows having no parent.

           wgetscrreg
                  stores  the the top and bottom rows for the scrolling margin set
                  by wsetscrreg(3x) in the corresponding arguments, returning  ERR
                  upon failure and OK upon successful completion.

## RETURN VALUE

           These functions return TRUE or FALSE except as noted.

## NOTES

           ncurses  provides  both  a C function and a preprocessor macro for each
           function documented in this page.

## PORTABILITY

           These routines are specific to ncurses.  They  were  not  supported  on
           Version 7, BSD or System V implementations.  It is recommended that any
           code   depending   on   ncurses   extensions   be   conditioned   using
           NCURSES_VERSION.

## SEE ALSO

           curses(3x),    curs_inopts(3x),   curs_outopts(3x),   curs_threads(3x),
           curs_window(3x)

    ncurses 6.4                       2023-12-16                   curs_opaque(3x)