diff options
Diffstat (limited to 'src/frame.h')
| -rw-r--r-- | src/frame.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/src/frame.h b/src/frame.h index 376df528466..84f9a05d774 100644 --- a/src/frame.h +++ b/src/frame.h @@ -1111,7 +1111,8 @@ default_pixels_per_inch_y (void) /* FOR_EACH_FRAME (LIST_VAR, FRAME_VAR) followed by a statement is a `for' loop which iterates over the elements of Vframe_list. The loop will set FRAME_VAR, a Lisp_Object, to each frame in - Vframe_list in succession and execute the statement. LIST_VAR + Vframe_list in succession and execute the statement. Vframe_list + should be nonempty, so the body is executed at least once. LIST_VAR should be a Lisp_Object too; it is used to iterate through the Vframe_list. Note that this macro walks over child frames and the tooltip frame as well. @@ -1121,7 +1122,7 @@ default_pixels_per_inch_y (void) something which executes the statement once. */ #define FOR_EACH_FRAME(list_var, frame_var) \ - for ((list_var) = Vframe_list; \ + for ((list_var) = (eassume (CONSP (Vframe_list)), Vframe_list); \ (CONSP (list_var) \ && (frame_var = XCAR (list_var), true)); \ list_var = XCDR (list_var)) |