| Allegro CL version 8.2 Unrevised from 8.1 to 8.2. 8.1 version |
Arguments: stream
This is a predicate which returns t
if
stream is positioned at the beginning of a line,
else returns nil
. It is permissible to always
return nil
. This is used in the
implementation of fresh-line. Note that while a value of 0 from
stream-line-column also
indicates the beginning of a line, there are cases where stream-start-line-p can be
meaningfully implemented although stream-line-column can't be. For example, for
a window using variable-width characters, the column number isn't very
meaningful, but the beginning of the line does have a clear
meaning. The default method for stream-start-line-p on class fundamental-character-output-stream
uses
stream-line-column, so if
that is defined to return nil
, then a method
should be provided for either stream-start-line-p or stream-fresh-line.
See also streams.htm for general information on streams in Allegro CL.
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 |