| Allegro CL version 8.2 Unrevised from 8.1 to 8.2. 8.1 version |
Arguments: object
Returns true if object is an instance of the
screen
class, and returns
nil
otherwise. This may be useful for
determining whether the owner
or parent of a window is the
screen rather than a window, for example.
Currently there is only a single screen object, but a possible future
enhancement would be the support of multiple monitors, where there is
a screen object for each monitor. In that situation, calling screenp would be preferable to an
expression such as (eq my-stream (screen *system*))
(see screen and *system*
).
See also windowp.
Copyright (c) 1998-2016, Franz Inc. Oakland, CA., USA. All rights reserved.
This page was not revised from the 8.1 page.
Created 2010.1.21.
| Allegro CL version 8.2 Unrevised from 8.1 to 8.2. 8.1 version |