286efd2012-03-24Henrik Grubbström (Grubba) <html> <head> <title>Pike Reference Manual - #define</title> <link rel='stylesheet' href='../../style.css' /> <style type='text/css'> svg line { stroke:#343434; stroke-width:2; } svg text { fill:#343434; } svg a { fill:#0768b2; text-decoration: underline; } </style> </head> <body link="#0768b2" alink="#002040" vlink="#0768b2"> <header> <div> <div style="text-align:right;">Extracted from as of .</div> <div style="overflow:hidden;"> <a href="http://pike.lysator.liu.se/" style="float:left; width:181px; height:41px; margin:10px; margin-left:22px; margin-right:25px; background-image:url('../../../images/pike_logo.gif');"></a> <div style="margin:10px; height:11px; margin-top:26px; margin-right:19px; overflow:hidden; background-image:url('../../../images/pike_line_middle.gif');"> <span style="float:left; width:5px; height:11px; background-image:url('../../../images/pike_line_left.gif');">&nbsp;</span> <span style="float:right; width:5px; height:11px; background-image:url('../../../images/pike_line_right.gif');">&nbsp;</span> </div> </div> </div> </header> <div> <div class="navbar"> <nav> <a href='../../index.html'><b class='top head'>Top</b></a> <a href='../../ex/cpp_3A_3A.html'><b class='head'>cpp::</b></a> <script></script> <noscript> <div class='sidebar'> <a href='../../ex/cpp_3A_3A/index.html'><b>Symbol index</b></a><br /> </div> </noscript> </nav> </div> <div class="navbox"> <nav> <div class="sidebar"> <a href="../../ex/cpp_3A_3A/_23charset.html" class="left" ><img src="../../../images/prev.gif" hspace="3" border="0" alt="previous" >#charset</a> <a href="../../ex/cpp_3A_3A/_23elif.html" class="right" >#elif<img src="../../../images/next.gif" hspace="3" border="0" alt="next" ></a> </div> </nav> </div> <div class="contentbox"> <article> <h1>Directive #define</h1> <hr /> <dl class='group--doc'> <dt class='head--type'><span class='homogen--type'>Directive</span> <span class='homogen--name'><b>#define</b></span> </dt> <dd><p><code class='directive'>#define</code></p></dd> <dt class='head--doc'>Description</dt> <dd class='body--doc'><p>This directive is used to define or redefine a cpp macro.</p> <p> The simplest way to use define is to write</p>
d6d6d92022-03-09Henrik Grubbström (Grubba) <pre><code>#define &lt;identifier&gt; &lt;replacement string&gt;</code></pre><p>which will cause all subsequent occurances of <tt><b><i>&lt;identifier</i></b></tt>
286efd2012-03-24Henrik Grubbström (Grubba)  to be replaced with the <tt><i>&lt;replacement string&gt;</i></tt>.</p> <p> Define also has the capability to use arguments, thus a line like</p>
d6d6d92022-03-09Henrik Grubbström (Grubba) <pre><code>#define &lt;identifier&gt;(arg1, arg2) &lt;replacement string&gt;</code></pre><p>would cause <tt><b><i>&lt;identifer&gt;</i></b></tt> to be a macro. All occurances of
286efd2012-03-24Henrik Grubbström (Grubba)  '<tt><b><i>&lt;identifier&gt;</i></b>(something1,something2d)</tt>' would be replaced with the <tt><i>&lt;replacement string&gt;</i></tt>. And in the <tt><i>&lt;replacement string&gt;</i></tt>, <tt>arg1</tt> and <tt>arg2</tt> will be replaced with <tt>something1</tt> and <tt>something2</tt>.</p> </dd></dl> </article> <footer> <hr size="1" noshade="1" /> </footer> </div> </div> </body> <script>PikeDoc.current = {"link":"ex/cpp_3A_3A/_23define.html","name":"#define"};</script> <script src='../../ex/cpp_3A_3A/index.js'></script> <script src='../../ex/cpp_3A_3A/load_index.js'></script> </html>