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  ANSI Common Lisp   21 Streams   21.1 Stream Concepts

21.1.1 Introduction to Streams

A stream is an object that can be used with an input or output function to identify an appropriate source or sink of characters or bytes for that operation. A character stream is a source or sink of characters. A binary stream is a source or sink of bytes.

Some operations may be performed on any kind of stream; the next figure provides a list of standardized operations that are potentially useful with any kind of stream.

Some General-Purpose Stream Operations
close stream-element-type
input-stream-p streamp
interactive-stream-p with-open-stream

Other operations are only meaningful on certain stream types. For example, read-char is only defined for character streams and read-byte is only defined for binary streams.  Abstract Classifications of Streams  Abstract Classifications of Streams  Other Subclasses of Stream

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