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autodoc.git/modref/ex/cpp_3A_3A/_23else.html:1: + <html><head> + <style type='text/css'> + svg line { stroke:#343434; stroke-width:2; } + svg text { fill:#343434; } + svg a { fill:#0768b2; text-decoration: underline; } + </style> + <title>Pike Reference Manual - #else</title> + <link rel='stylesheet' href='../../style.css' /></head> + <body topmargin='0' leftmargin='0' marginheight='0' marginwidth='0' +  bgcolor='#ffffff' text='#000000' link='#000099' alink='#002040' +  vlink='#000099'>    -  + <table widht="100%"> +  <tr> +  <td colspan='3'></td> +  <td colspan='2' align='right'>Extracted from at .</td> +  </tr> +  <tr> +  <td width="0%"><img src="../../../images/unit.gif" alt="" width="10" height="1"></td> +  <td width="1%"> +  <a href="http://pike.lysator.liu.se/"><img src="../../../images/pike_logo.gif" +  border="0" alt="pike.lysator.liu.se" width="181" height="41" hspace="5"></a></td> +  <td width="0%"><img src="../../../images/unit.gif" alt="" width="10" height="1"></td> +  <td width="99%"> +  <table align="center" border="0" width="100%" cellspacing="0" cellpadding="0" valign="center"> +  <tr> +  <td width="1%"> +  <img src="../../../images/pike_line_left.gif" alt="" border="0" width="5" height="11"> +  </td> +  <td background="../../../images/pike_line_middle.gif" width="98%"> +  <img src="../../../images/unit.gif" alt="" border="0" width="11" height="11"> +  </td> +  <td width="1%"> +  <img src="../../../images/pike_line_right.gif" alt="" border="0" width="5" height="11"> +  </td> +  </tr> +  </table> +  </td> +  <td width="0%"><img src="../../../images/unit.gif" alt="" width="10" height="1"></td> +  </tr> +  <tr> +  <td colspan="5"><img src="../../../images/unit.gif" alt="" width="1" height="10"></td> +  </tr> + </table> +  + <table> +  <tr> +  <td width='180' valign='top' bgcolor='#f0f0f0'><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> + </td> +  <td width='520' valign='top'> +  +  <table border="0" width="520" bgcolor="#e0e0e0" +  cellpadding="0" cellspacing="4" class='sidebar'> +  <tr> +  <td valign="middle"> +  <a href="../../ex/cpp_3A_3A/_23elif.html"><img src="../../../images/prev.gif" hspace="3" +  border="0" alt="previous" >#elif</a> +  <br /> +  </td> +  <td align="right" valign="middle"> +  <a href="../../ex/cpp_3A_3A/_23elseif.html">#elseif<img src="../../../images/next.gif" hspace="3" +  border="0" alt="next" ></a> +  <br /> +  </td> +  </tr> +  </table> +  +  <h1>Directive #else</h1> +  +  + <hr /> + <dl class='group--doc'> + <dt class='head--type'><span class='homogen--type'>Directive</span> + <span class='homogen--name'><b>#else</b></span> + </dt> + <dd><p><code class='directive'>#if</code><br> + <code class='directive'>#elif</code><br> + <code class='directive'>#elseif</code><br> + <code class='directive'>#else</code><br> + <code class='directive'>#endif</code></p></dd> +  + <dt class='head--doc'>Description</dt> + <dd class='body--doc'> +  + <p>The #if directive causes conditional compiling of code depending on + the expression after the #if directive. That is, if the expression + is true, the code up to the next #else, #elif, #elseif or #endif is + compiled. If the expression is false, that code will be skipped. + If the skip leads up to a #else, the code after the else will be + compiled. #elif and #elseif are equivialent and causes the code that + follow them to be compiled if the previous #if or #elif evaluated + false and the expression after the #elif evaluates true. + </p> + <p>Expressions given to #if, #elif or #endif are special, all identifiers + evaluate to zero unless they are defined to something else. Integers, + strings and floats are the only types that can be used, but all pike + operators can be used on these types. + </p> + <p>Also, two special functions can be used, defined() and constant(). + defined(&lt;identifer&gt;) expands to '1' if the identifier is defined, + '0' otherwise. constant(&lt;identifier&gt;) expands to '1' if identifer is + an predefined constant (with add_constant), '0' otherwise.</p> + </dd> + <dt class='head--doc'>Example</dt> + <dd class='example'><pre> + <tt><p>#if 1<br /> + <dl class='group--doc'><dd>write("foo");<br /> + </dd> + </dl>#else<br /> + <dl class='group--doc'><dd>write("bar");<br /> + </dd> + </dl>#endif<br /> +  + </p> + <p>#if defined(FOO)<br /> + <dl class='group--doc'><dd>write(FOO);<br /> + </dd> + </dl>#elif defined(BAR)<br /> + <dl class='group--doc'><dd>write(BAR);<br /> + </dd> + </dl>#else<br /> + <dl class='group--doc'><dd>write("default");<br /> + </dd> + </dl>#endif<br /> +  + </p> + <p>#if !constant(write_file)<br /> + inherit "simulate.pike"<br /> + #endif<br /> + <br /> + </p> + </tt></pre></dd></dl> +  +  +  <hr size='1' noshade='1' /> +  </td> +  </tr> + </table> + </body> + <script>PikeDoc.current = {"link":"ex/cpp_3A_3A/_23else.html","name":"#else"};</script> + <script src='../../ex/cpp_3A_3A/index.js'></script> + <script src='../../ex/cpp_3A_3A/load_index.js'></script> + </html>