add-stream-instance-flags

Macro

Package: excl

Arguments: stream &rest flag-names

Adds (via logior) the specified instance flags to the standard-instance object that is the stream. Note that this flags field has no correlation to a flags slot in the stream. You may inspect a stream in raw mode to see the instance-flags (see inspector.htm).

Valid instance flags are placed into the following groups:

• Direct stream subclass (select exactly one): :gray (identifies a Gray or fundamental-stream) or :simple (identifies a simple-stream). A stream instance that has neither bit set is not considered a stream.
• Open-ness (select one, both, or none): :input (stream may perform input operations); :output (stream may perform output operations). A stream instance that has neither bit set is not considered an open stream.
• Direct simple-stream subclass (select zero or one): :dual (stream is a dual-channel stream); :string (stream is a string-stream). A stream with neither bit set is considered a single-channel stream

See streams.htm for information on the simple-streams implementation in Allegro CL.

The documentation is described in introduction.htm and the index is in index.htm.

Copyright (c) 1998-2000, Franz Inc. Berkeley, CA., USA. All rights reserved.

Created 2000.10.5.