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       touchwin, touchline, untouchwin, wtouchln, is_linetouched,
       is_wintouched - curses refresh control routines


       #include <curses.h>
       int touchwin(WINDOW *win);
       int touchline(WINDOW *win, int start, int count);
       int untouchwin(WINDOW *win);
       int wtouchln(WINDOW *win, int y, int n, int changed);
       bool is_linetouched(WINDOW *win, int line);
       bool is_wintouched(WINDOW *win);


       The  touchwin  and  touchline  routines  throw  away  all  optimization
       information  about  which  parts  of  the  window have been touched, by
       pretending that the entire window has been drawn on.  This is sometimes
       necessary  when using overlapping windows, since a change to one window
       affects the other window, but the records  of  which  lines  have  been
       changed  in  the  other  window do not reflect the change.  The routine
       touchline only pretends that count lines have been  changed,  beginning
       with line start.

       The untouchwin routine marks all lines in the window as unchanged since
       the last call to wrefresh.

       The wtouchln routine makes n lines in the window, starting at  line  y,
       look  as  if they have (changed=1) or have not (changed=0) been changed
       since the last call to wrefresh.

       The is_linetouched  and  is_wintouched  routines  return  TRUE  if  the
       specified  line/window  was  modified  since the last call to wrefresh;
       otherwise they return FALSE.  In addition, is_linetouched  returns  ERR
       if line is not valid for the given window.


       All  routines  return the integer ERR upon failure and an integer value
       other than ERR upon successful completion, unless  otherwise  noted  in
       the preceding routine descriptions.

       X/Open does not define any error conditions.  In this implementation

                   returns  an  error if the window pointer is null, or if the
                   line number is  outside  the  window.   Note  that  ERR  is
                   distinct  from  TRUE and FALSE, which are the normal return
                   values of this function.

                   returns an error if the window pointer is null, or  if  the
                   line number is outside the window.


       The XSI Curses standard, Issue 4 describes these functions.

       Some  historic  curses implementations had, as an undocumented feature,
       the  ability  to  do  the  equivalent  of  clearok(...,  1)  by  saying
       touchwin(stdscr) or clear(stdscr).  This will not work under ncurses.


       Note that all routines except wtouchln may be macros.


       ncurses(3NCURSES), refresh(3NCURSES), curses_variables(3NCURSES).


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