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## 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) 1998-2022, Franz Inc. Lafayette, CA., USA. All rights reserved.
This page was not revised from the 10.0 page.
Created 2019.8.20.

|  | ToC | DocOverview | CGDoc | RelNotes | FAQ | Index | PermutedIndex
| Allegro CL version 10.1 Unrevised from 10.0 to 10.1. 10.0 version