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<h4 class="subsection">Stream Type</h4> <p>A <em>stream</em> is an object that can be used as a source or sink for characters—either to supply characters for input or to accept them as output. Many different types can be used this way: markers, buffers, strings, and functions. Most often, input streams (character sources) obtain characters from the keyboard, a buffer, or a file, and output streams (character sinks) send characters to a buffer, such as a <samp>*Help*</samp> buffer, or to the echo area. </p> <p>The object <code>nil</code>, in addition to its other meanings, may be used as a stream. It stands for the value of the variable <code>standard-input</code> or <code>standard-output</code>. Also, the object <code>t</code> as a stream specifies input using the minibuffer (see <a href="minibuffers">Minibuffers</a>) or output in the echo area (see <a href="the-echo-area">The Echo Area</a>). </p> <p>Streams have no special printed representation or read syntax, and print as whatever primitive type they are. </p> <p>See <a href="read-and-print">Read and Print</a>, for a description of functions related to streams, including parsing and printing functions. </p><div class="_attribution">
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Copyright © 1990-1996, 1998-2022 Free Software Foundation, Inc. <br>Licensed under the GNU GPL license.<br>
<a href="https://www.gnu.org/software/emacs/manual/html_node/elisp/Stream-Type.html" class="_attribution-link">https://www.gnu.org/software/emacs/manual/html_node/elisp/Stream-Type.html</a>
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