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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>2.6. Sharpsign</title><link rel="stylesheet" href="impnotes.css" type="text/css" /><link rev="made" href="mailto:clisp-list@lists.sourceforge.net" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot_8465" /><link rel="home" href="index.html" title="Implementation Notes for GNU CLISP" /><link rel="up" href="syntax.html" title="Chapter 2. Syntax" /><link rel="prev" href="backquote.html" title="2.5. Backquote" /><link rel="next" href="eval.html" title="Chapter 3. Evaluation and Compilation" /><link rel="copyright" href="legalese.html" title="Legal Status of the CLISP Implementation Notes" /><meta name="date" content="'generated: 2009-07-28 12:48:49-04:00'" /><link rel="author" title="Authors" href="index.html#authors" /><link rel="contents" title="Table of Contents" href="index.html" /><link rel="glossary" href="glossary.html" /><link rel="help" href="faq.html#faq-help" title="How do I ask for help?" /><link rel="home" title="Home" href="http://clisp.cons.org" /><link rel="index" href="idx.html" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">2.6. Sharpsign </th></tr><tr><td width="20%" align="left"><a accesskey="p" href="backquote.html">Prev</a> </td><th width="60%" align="center">Chapter 2. Syntax </th><td width="20%" align="right"> <a accesskey="n" href="eval.html">Next</a></td></tr></table><hr /></div><div class="section" title="2.6. Sharpsign"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="sharpsign"></a>2.6. Sharpsign
<a class="clhs" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8.html">[sec_2-4-8]</a></h2></div></div></div><div class="toc"><dl><dt><span class="section"><a href="sharpsign.html#sharpsign-backslash">2.6.1. Sharpsign Backslash </a></span></dt><dt><span class="section"><a href="sharpsign.html#sharpsign-less-than">2.6.2. Sharpsign Less-Than-Sign </a></span></dt></dl></div><p>Reader macros are also defined for the following:
</p><div class="variablelist" title="Additional reader macros"><a id="extra-read-macro-table"></a><p class="title"><b>Additional reader macros</b></p><dl><dt><span class="term">#,</span></dt><dd>load-time evaluation, kept despite the [<span class="citation"><a class="link" href="references.html#ansi-cl" title="ANSI INCITS 226-1994 (R1999) Information Technology - Programming Language - Common Lisp [formerly ANSI X3.226-1994 (R1999)]">ANSI CL standard</a></span>]
issue <a class="ulink" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Issues/iss315.html" target="_top">SHARP-COMMA-CONFUSION:REMOVE</a>.</dd><dt><span class="term">#Y</span></dt><dd>compiled <a class="ulink" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/syscla_function.html" target="_top"><code class="classname">FUNCTION</code></a> objects and <a class="" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/glo_i.html#input">input</a> <a class="ulink" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/syscla_stream.html" target="_top"><code class="classname">STREAM</code></a>'s <a class="link" href="encoding.html" title="31.5. Encodings"><code class="classname">EXT:ENCODING</code></a>s
</dd><dt><span class="term">#""</span></dt><dd><a class="ulink" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/syscla_pathname.html" target="_top"><code class="classname">PATHNAME</code></a>: <code class="filename">#"test.lisp"</code>
is the value of <code class="code">(<a class="ulink" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/fun_pathname.html" target="_top"><code class="function">PATHNAME</code></a> "test.lisp")</code></dd></dl></div><div class="section" title="2.6.1. Sharpsign Backslash"><div class="titlepage"><div><div><h3 class="title"><a id="sharpsign-backslash"></a>2.6.1. Sharpsign Backslash
<a class="clhs" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-1.html">[sec_2-4-8-1]</a></h3></div></div></div><p><span class="keysym">#\Code</span> allows input of characters of arbitrary code:
e.g., <span class="keysym">#\Code231</span> reads as the character
<code class="code">(<a class="ulink" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/fun_code-char.html" target="_top"><code class="function">CODE-CHAR</code></a> 231)</code>.</p></div><div class="section" title="2.6.2. Sharpsign Less-Than-Sign"><div class="titlepage"><div><div><h3 class="title"><a id="sharpsign-less-than"></a>2.6.2. Sharpsign Less-Than-Sign
<a class="clhs" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">[sec_2-4-8-20]</a></h3></div></div></div><p>This is the list of objects whose external representation cannot
be meaningfully read in:</p><div class="variablelist" title="Unreadable objects"><a id="unreadable-objects"></a><p class="title"><b>Unreadable objects</b></p><dl><dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a><em class="replaceable"><code>type</code></em> ...&gt;</code></span></span></dt><dd>all <a class="ulink" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/cla_structure-object.html" target="_top"><code class="classname">STRUCTURE-OBJECT</code></a>s lacking a keyword
constructor</dd><dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a>ARRAY <em class="replaceable"><code>type</code></em>
<em class="replaceable"><code>dimensions</code></em>&gt;</code></span></span></dt><dd>all <a class="ulink" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/syscla_array.html" target="_top"><code class="classname">ARRAY</code></a>s except <a class="ulink" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/syscla_string.html" target="_top"><code class="classname">STRING</code></a>s, if
<a class="ulink" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/var_stprint-arrayst.html" target="_top"><code class="varname">*PRINT-ARRAY*</code></a> is <a class="ulink" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/convar_nil.html" target="_top"><code class="constant">NIL</code></a></dd><dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a>SYSTEM-FUNCTION <em class="replaceable"><code>name</code></em>&gt;</code></span></span></dt><dd>built-in function written in <a class="ulink" href="http://c-faq.com/" target="_top"><span class="command"><strong>C</strong></span></a>
</dd><dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a>ADD-ON-SYSTEM-FUNCTION
<em class="replaceable"><code>name</code></em>&gt;</code></span></span></dt><dd><a class="link" href="modules.html" title="32.2. External Modules">module</a> function written in <a class="ulink" href="http://c-faq.com/" target="_top"><span class="command"><strong>C</strong></span></a>
</dd><dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a>SPECIAL-OPERATOR
<em class="replaceable"><code>name</code></em>&gt;</code></span></span></dt><dd>special operator handler</dd><dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a>COMPILED-CLOSURE
<em class="replaceable"><code>name</code></em>&gt;</code></span></span></dt><dd>compiled function, if <a class="link" href="multi-rep.html#pr-closure" title="Variable CUSTOM:*PRINT-CLOSURE*"><code class="varname">CUSTOM:*PRINT-CLOSURE*</code></a> is <a class="ulink" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/convar_nil.html" target="_top"><code class="constant">NIL</code></a>
</dd><dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a>CLOSURE <em class="replaceable"><code>name</code></em> ...&gt;</code></span></span></dt><dd>interpreted function</dd><dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a>FRAME-POINTER #x...&gt;</code></span></span></dt><dd>pointer to a stack frame</dd><dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a>DISABLED POINTER&gt;</code></span></span></dt><dd>frame pointer which has become invalid on exit from the
corresponding <a class="ulink" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/speope_block.html" target="_top"><code class="function">BLOCK</code></a> or <a class="ulink" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/speope_tagbody.html" target="_top"><code class="function">TAGBODY</code></a></dd><dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a>...STREAM...&gt;</code></span></span></dt><dd><a class="ulink" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/syscla_stream.html" target="_top"><code class="classname">STREAM</code></a></dd><dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a>PACKAGE <em class="replaceable"><code>name</code></em>&gt;</code></span></span></dt><dd><a class="ulink" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/syscla_package.html" target="_top"><code class="classname">PACKAGE</code></a></dd><dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a>HASH-TABLE #x...&gt;</code></span></span></dt><dd><a class="ulink" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/syscla_hash-table.html" target="_top"><code class="classname">HASH-TABLE</code></a>, if <a class="ulink" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/var_stprint-arrayst.html" target="_top"><code class="varname">*PRINT-ARRAY*</code></a> is <a class="ulink" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/convar_nil.html" target="_top"><code class="constant">NIL</code></a>
</dd><dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a>READTABLE #x...&gt;</code></span></span></dt><dd><a class="ulink" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/syscla_readtable.html" target="_top"><code class="classname">READTABLE</code></a></dd><dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a>SYMBOL-MACRO <em class="replaceable"><code>form</code></em>&gt;</code></span></span></dt><dd><a class="clhs" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/mac_define-symbol-macro.html"><code class="classname">SYMBOL-MACRO</code></a> handler</dd><dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a>MACRO <em class="replaceable"><code>function</code></em>&gt;</code></span></span></dt><dd>macro expander (defined by <a class="ulink" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/mac_defmacro.html" target="_top"><code class="function">DEFMACRO</code></a> and friends)
</dd>
<!--#ifdef FOREIGN-->
<dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a><a class="link" href="dffi.html#fptr"><code class="classname">FFI:FOREIGN-POINTER</code></a>
#x...&gt;</code></span></span></dt><dd>foreign pointer (<span class="plat-dep">Platform Dependent: <span class="plat-dep"><a class="ulink" href="http://www.unix.org/online.html" target="_top"><span class="strong"><strong>UNIX</strong></span></a>, <a class="ulink" href="http://winehq.org/" target="_top"><span class="platform">Win32</span></a> platforms only.</span></span>)
</dd>
<!--#endif-->
<!--#ifdef DYNAMIC_FFI-->
<dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a><a class="link" href="dffi.html#faddr"><code class="classname">FFI:FOREIGN-ADDRESS</code></a>
#x...&gt;</code></span></span></dt><dd>foreign address
(<span class="plat-dep">Platform Dependent: <span class="plat-dep"><a class="ulink" href="http://www.unix.org/online.html" target="_top"><span class="strong"><strong>UNIX</strong></span></a>, <a class="ulink" href="http://winehq.org/" target="_top"><span class="platform">Win32</span></a> platforms only.</span></span>)</dd><dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a><a class="link" href="dffi.html#dffi-variables" title="32.3.5. Foreign variables"><code class="classname">FFI:FOREIGN-VARIABLE</code></a> <em class="replaceable"><code>name</code></em>
#x...&gt;</code></span></span></dt><dd>foreign variable (<span class="plat-dep">Platform Dependent: <span class="plat-dep"><a class="ulink" href="http://www.unix.org/online.html" target="_top"><span class="strong"><strong>UNIX</strong></span></a>, <a class="ulink" href="http://winehq.org/" target="_top"><span class="platform">Win32</span></a> platforms only.</span></span>)
</dd><dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a><a class="link" href="dffi.html" title="32.3. The Foreign Function Call Facility"><code class="classname">FFI:FOREIGN-FUNCTION</code></a> <em class="replaceable"><code>name</code></em>
#x...&gt;</code></span></span></dt><dd>foreign function (<span class="plat-dep">Platform Dependent: <span class="plat-dep"><a class="ulink" href="http://www.unix.org/online.html" target="_top"><span class="strong"><strong>UNIX</strong></span></a>, <a class="ulink" href="http://winehq.org/" target="_top"><span class="platform">Win32</span></a> platforms only.</span></span>)
</dd>
<!--#endif-->
<dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a>UNBOUND&gt;</code></span></span></dt><dd><span class="quote"><span class="quote">value</span></span> of an unbound symbol, an unsupplied
optional or keyword argument</dd><dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a>SPECIAL REFERENCE&gt;</code></span></span></dt><dd>environment marker for variables declared <a class="ulink" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/dec_special.html" target="_top"><code class="literal">SPECIAL</code></a>
</dd><dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a>DOT&gt;</code></span></span></dt><dd>internal <a class="ulink" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/fun_readcm_re_g-whitespace.html" target="_top"><code class="function">READ</code></a> result for <span class="quote"><span class="quote">.</span></span>
</dd><dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a>END OF FILE&gt;</code></span></span></dt><dd>internal <a class="ulink" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/fun_readcm_re_g-whitespace.html" target="_top"><code class="function">READ</code></a> result, when the <code class="literal"><a class="" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/glo_e.html#end-of-stream">end-of-stream</a></code> is reached
</dd><dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a>READ-LABEL ...&gt;</code></span></span></dt><dd>intermediate <a class="ulink" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/fun_readcm_re_g-whitespace.html" target="_top"><code class="function">READ</code></a> result for <a class="clhs" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-16.html"><span class="data"><code class="literal">#n#</code></span></a>
</dd><dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a>ADDRESS #x...&gt;</code></span></span></dt><dd>machine address, should not occur
</dd><dt><span class="term"><span class="data"><code class="literal"><a href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-20.html">#&lt;</a>SYSTEM-POINTER #x...&gt;</code></span></span></dt><dd>should not occur</dd></dl></div></div></div><div class="bookinfo"><hr /><table width="100%" summary="impnotes meta info"><th><td align="left">These notes document <a class="ulink" href="http://clisp.cons.org" target="_top"><span class="command"><strong>CLISP</strong></span></a> version 2.48</td><td align="right">Last modified: 2009-07-28</td></th></table></div><div class="custom-footer"><hr /><table width="100%"><tr><td align="left"><a href="http://clisp.cons.org"><img src="clisp.png" width="48" height="48" alt="[CLISP home]" /></a></td><td align="center"><a href="https://sourceforge.net/donate/index.php?group_id=1355"><img src="http://images.sourceforge.net/images/project-support.jpg" width="88" height="32" alt="[Support CLISP]" /></a></td><td align="right"><a href="https://sourceforge.net/projects/clisp"><img width="120" height="30" alt="[SourceForge]" src="http://sflogo.sourceforge.net/sflogo.php?group_id=1355&amp;type=12&amp;page=sharpsign" /></a></td></tr></table></div><hr /><form method="get" action="http://www.google.com/custom" target="_top"><table width="100%" border="0"><tr><td nowrap="nowrap" align="center"><input type="hidden" name="domains" value="clisp.cons.org;clisp.podval.org;www.lisp.org" /><label for="sbi" style="display: none">Enter your search terms</label><input type="text" name="q" size="50" maxlength="255" id="sbi" value="2.6. Sharpsign" /><label for="sbb" style="display: none">Submit search form</label><input type="submit" name="sa" value="Google Search" id="sbb" /></td></tr><tr><td nowrap="nowrap" align="center"><input type="radio" name="sitesearch" value="" checked="1" id="ss0" /><label for="ss0" title="Search the Web"><small>Web</small></label><input type="radio" name="sitesearch" value="clisp.cons.org" id="ss1" /><label for="ss1" title="Search clisp.cons.org"><small>clisp.cons.org</small></label><input type="radio" name="sitesearch" value="clisp.podval.org" id="ss2" /><label for="ss2" title="Search clisp.podval.org"><small>clisp.podval.org</small></label><input type="radio" name="sitesearch" value="www.lisp.org" id="ss3" /><label for="ss3" title="Search www.lisp.org"><small>www.lisp.org</small></label><input type="hidden" name="client" value="pub-4445255502750357" /><input type="hidden" name="forid" value="1" /><input type="hidden" name="ie" value="UTF-8" /><input type="hidden" name="oe" value="UTF-8" /><input type="hidden" name="cof" value="GALT:#008000;GL:1;DIV:#336699;VLC:663399;AH:center;BGC:FFFFFF;LBGC:000000;ALC:0000FF;LC:0000FF;T:000000;GFNT:0000FF;GIMP:0000FF;LH:48;LW:48;L:http://clisp.cons.org/clisp.png;S:http://clisp.cons.org;FORID:1" /><input type="hidden" name="hl" value="en" /></td></tr></table></form><hr /><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="backquote.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="syntax.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="eval.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">2.5. Backquote  </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 3. Evaluation and Compilation </td></tr></table></div></body></html>