43 lines
2.3 KiB
HTML
43 lines
2.3 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN">
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<!Converted with LaTeX2HTML 0.6.5 (Tue Nov 15 1994) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds >
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<HEAD>
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<TITLE>2.10. Streams</TITLE>
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</HEAD>
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<BODY>
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<meta name="description" value=" Streams">
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<meta name="keywords" value="clm">
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<meta name="resource-type" value="document">
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<meta name="distribution" value="global">
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<P>
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<b>Common Lisp the Language, 2nd Edition</b>
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<BR> <HR><A NAME=tex2html1963 HREF="node38.html"><IMG ALIGN=BOTTOM ALT="next" SRC="icons/next_motif.gif"></A> <A NAME=tex2html1961 HREF="node15.html"><IMG ALIGN=BOTTOM ALT="up" SRC="icons/up_motif.gif"></A> <A NAME=tex2html1955 HREF="node36.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="icons/previous_motif.gif"></A> <A NAME=tex2html1965 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="icons/contents_motif.gif"></A> <A NAME=tex2html1966 HREF="index.html"><IMG ALIGN=BOTTOM ALT="index" SRC="icons/index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html1964 HREF="node38.html"> Random-States</A>
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<B>Up:</B> <A NAME=tex2html1962 HREF="node15.html"> Data Types</A>
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<B> Previous:</B> <A NAME=tex2html1956 HREF="node36.html"> Pathnames</A>
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<HR> <P>
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<H1><A NAME=SECTION006100000000000000000>2.10. Streams</A></H1>
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<P>
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A stream is a source or sink of data, typically characters or bytes.
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Nearly all functions that perform I/O do so with respect to a specified
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stream. The function <tt>open</tt> takes a pathname and returns a stream
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connected to the file specified by the pathname.
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There are a number of standard streams that are used by default for
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various purposes. See chapter <A HREF="node182.html#STREAM">21</A>.
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<P>
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<img align=bottom alt="change_begin" src="gif/change_begin.gif"><br>
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X3J13 voted in January 1989
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(STREAM-ACCESS) <A NAME=1316> </A>
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to introduce subtypes of type <tt>stream</tt>:
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<tt>broadcast-stream</tt>, <tt>concatenated-stream</tt>,
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<tt>echo-stream</tt>, <tt>synonym-stream</tt>, <tt>string-stream</tt>, <tt>file-stream</tt>,
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and <tt>two-way-stream</tt> are disjoint subtypes of <tt>stream</tt>.
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Note particularly that a synonym stream is always and only of type
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<tt>synonym-stream</tt>, regardless of the type of the stream for which it is a synonym.
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<br><img align=bottom alt="change_end" src="gif/change_end.gif">
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<P>
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<HR>
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<P><ADDRESS>
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AI.Repository@cs.cmu.edu
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</ADDRESS>
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</BODY>
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