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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
output-stream-p |
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. 21.1.1.1 Abstract Classifications of Streams 21.1.1.2 Abstract Classifications of Streams 21.1.1.3 Other Subclasses of Stream

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