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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><meta name="viewport" content="width=device-width, initial-scale=0.8"/><title>16.2 General Macro Transformers</title><link rel="stylesheet" type="text/css" href="../scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="../racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-style.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../doc-site.css" title="default"/><script type="text/javascript" src="../scribble-common.js"></script><script type="text/javascript" src="../manual-racket.js"></script><script type="text/javascript" src="../manual-racket.js"></script><script type="text/javascript" src="../doc-site.js"></script><script type="text/javascript" src="../local-redirect/local-redirect.js"></script><script type="text/javascript" src="../local-redirect/local-user-redirect.js"></script><!--[if IE 6]><style type="text/css">.SIEHidden { overflow: hidden; }</style><![endif]--></head><body id="doc-racket-lang-org"><div class="tocset"><div class="tocview"><div class="tocviewlist tocviewlisttopspace"><div class="tocviewtitle"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,"tocview_0");">►</a></td><td></td><td><a href="index.html" class="tocviewlink" data-pltdoc="x">The Racket Guide</a></td></tr></table></div><div class="tocviewsublisttop" style="display: none;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1 </td><td><a href="intro.html" class="tocviewlink" data-pltdoc="x">Welcome to Racket</a></td></tr><tr><td align="right">2 </td><td><a href="to-scheme.html" class="tocviewlink" data-pltdoc="x">Racket Essentials</a></td></tr><tr><td align="right">3 </td><td><a href="datatypes.html" class="tocviewlink" data-pltdoc="x">Built-<wbr></wbr>In Datatypes</a></td></tr><tr><td align="right">4 </td><td><a href="scheme-forms.html" class="tocviewlink" data-pltdoc="x">Expressions and Definitions</a></td></tr><tr><td align="right">5 </td><td><a href="define-struct.html" class="tocviewlink" data-pltdoc="x">Programmer-<wbr></wbr>Defined Datatypes</a></td></tr><tr><td align="right">6 </td><td><a href="modules.html" class="tocviewlink" data-pltdoc="x">Modules</a></td></tr><tr><td align="right">7 </td><td><a href="contracts.html" class="tocviewlink" data-pltdoc="x">Contracts</a></td></tr><tr><td align="right">8 </td><td><a href="i_o.html" class="tocviewlink" data-pltdoc="x">Input and Output</a></td></tr><tr><td align="right">9 </td><td><a href="regexp.html" class="tocviewlink" data-pltdoc="x">Regular Expressions</a></td></tr><tr><td align="right">10 </td><td><a href="control.html" class="tocviewlink" data-pltdoc="x">Exceptions and Control</a></td></tr><tr><td align="right">11 </td><td><a href="for.html" class="tocviewlink" data-pltdoc="x">Iterations and Comprehensions</a></td></tr><tr><td align="right">12 </td><td><a href="match.html" class="tocviewlink" data-pltdoc="x">Pattern Matching</a></td></tr><tr><td align="right">13 </td><td><a href="classes.html" class="tocviewlink" data-pltdoc="x">Classes and Objects</a></td></tr><tr><td align="right">14 </td><td><a href="units.html" class="tocviewlink" data-pltdoc="x">Units</a></td></tr><tr><td align="right">15 </td><td><a href="reflection.html" class="tocviewlink" data-pltdoc="x">Reflection and Dynamic Evaluation</a></td></tr><tr><td align="right">16 </td><td><a href="macros.html" class="tocviewselflink" data-pltdoc="x">Macros</a></td></tr><tr><td align="right">17 </td><td><a href="languages.html" class="tocviewlink" data-pltdoc="x">Creating Languages</a></td></tr><tr><td align="right">18 </td><td><a href="concurrency.html" class
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binding</span> for an identifier, which is a binding that can be used at
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compile time while expanding expressions to be evaluated at run time.
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The compile-time value associated with a transformer binding can be
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anything; if it is a procedure of one argument, then the binding is
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used as a macro, and the procedure is the <a name="(tech._macro._transformer)"></a><span style="font-style: italic">macro transformer</span>.</p><table cellspacing="0" cellpadding="0"><tr><td><p><span class="hspace"> </span><a href="stx-obj.html" class="toclink" data-pltdoc="x">16.2.1<span class="hspace"> </span>Syntax Objects</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="macro-transformers.html" class="toclink" data-pltdoc="x">16.2.2<span class="hspace"> </span>Macro Transformer Procedures</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="syntax-case.html" class="toclink" data-pltdoc="x">16.2.3<span class="hspace"> </span>Mixing Patterns and Expressions: <span class="RktSym"><span class="RktStxLink">syntax-case</span></span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="with-syntax.html" class="toclink" data-pltdoc="x">16.2.4<span class="hspace"> </span><span class="RktSym"><span class="RktStxLink">with-syntax</span></span> and <span class="RktSym"><span class="RktValLink">generate-temporaries</span></span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="stx-phases.html" class="toclink" data-pltdoc="x">16.2.5<span class="hspace"> </span>Compile and Run-Time Phases</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="phases.html" class="toclink" data-pltdoc="x">16.2.6<span class="hspace"> </span>General Phase Levels</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="phases.html#%28part._.Phases_and_.Bindings%29" class="toclink" data-pltdoc="x">16.2.6.1<span class="hspace"> </span>Phases and Bindings</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="phases.html#%28part._.Phases_and_.Modules%29" class="toclink" data-pltdoc="x">16.2.6.2<span class="hspace"> </span>Phases and Modules</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="stx-certs.html" class="toclink" data-pltdoc="x">16.2.7<span class="hspace"> </span>Tainted Syntax</a></p></td></tr></table><div class="navsetbottom"><span class="navleft"><form class="searchform"><input class="searchbox" id="searchbox" type="text" tabindex="1" placeholder="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, "8.6", "../");"/></form> <a href="https://docs.racket-lang.org/index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("8.6");">top</a><span class="tocsettoggle"> <a href="javascript:void(0);" title="show/hide table of contents" onclick="TocsetToggle();">contents</a></span></span><span class="navright"> <a href="pattern-macros.html" title="backward to "16.1 Pattern-Based Macros"" data-pltdoc="x">← prev</a> <a href="macros.html" title="up to "16 Macros"" data-pltdoc="x">up</a> <a href="stx-obj.html" title="forward to "16.2.1 Syntax Objects"" data-pltdoc="x">next →</a></span> </div></div></div><div id="contextindicator"> </div></body></html>
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