ClassPackage: exclToCDocOverviewCGDocRelNotesFAQIndexPermutedIndex
Allegro CL version 8.2
Unrevised from 8.1 to 8.2.
8.1 version

single-channel-simple-stream

This class has a single octet buffer and allows read-modify-write operations. File streams are single-channel streams.

A single-channel stream has one buffer and a directional state to specify whether the buffer and stream is in read, write, or read-modify mode. Flushes (device-writes) are performed when switching from write or read-modify to read mode if the buffer is dirty, and may involve a call to device-file-position. single-channel-simple-streams tend to support file-position and file-length, though this is not required.

A subclass of single-channel-simple-stream, namely direct-simple-stream, allows input from or output to a buffer directly. Subclasses of direct-simple-stream allow buffers to be read from or written to, in a similar manner as string-input or string-output streams.

A subclass of file-simple-stream and of direct-simple-stream allows the opening of mapped files. Instead of a buffer, a mapped file provides a direct mapping to the file within memory.

This kind of stream is useful for files and other devices which must allow random write/read access.

See streams.htm for a description of the new simple-stream stream implementation.


Copyright (c) 1998-2012, Franz Inc. Oakland, CA., USA. All rights reserved.
Documentation for Allegro CL version 8.2. This page was not revised from the 8.1 page.
Created 2010.1.21.

ToCDocOverviewCGDocRelNotesFAQIndexPermutedIndex
Allegro CL version 8.2
Unrevised from 8.1 to 8.2.
8.1 version