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if-defined.html
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<!DOCTYPE html>
<html lang="en">
<head>
<!--__GOLF_REDIRECT__-->
<title>If defined</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
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font-weight:400;
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<body>
<script>
function gg_copy(gt, eid, gc) {
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<!--GOLFMENU13-->
<!--GOLFENDMENU13-->
<!--BEGVDOC90-->
<div class='vhub' style='margin-top:10px;margin-right:20px;text-align:right;background-color:white;'><a href='https://golf-lang.com' style='border-bottom:0px'><img src='https://golf-lang.com/golf.png'/></a></div><div class='vhub' style='margin-top:10px;'> If defined</div><hr/><span style="font-weight:bold;">Purpose</span>: Conditional compilation.<br/>
<br/>
<div class='code' style='position:relative;padding-right:16px;'>
<pre id='code_511'>
<span class="Statement"> if-defined</span> <symbol>
<any code>
<span class="Statement"> end-defined</span>
<span class="Statement"> if-not-defined</span> <symbol>
<any code>
<span class="Statement"> end-defined</span></pre>
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<textarea id='golft_511' style='position: absolute;left: -500%;'></textarea>
<img src='https://golf-lang.com/golf-copy-small-1.png' id='golfb' onclick='gg_copy(golft_511, code_511, golf_copied_511)' style='position:absolute;right:0;top:0; cursor: pointer;opacity:0.5;'/>
</div><br/>
if-defined will cause <any code> to be compiled if <symbol> is defined (see "--cflag" option in gg). If <symbol> is not defined, then <any code> is not compiled at all.<br/>
<br/>
if-not-defined will cause <any code> to be compiled if <symbol> is not defined (see "--cflag" option in gg). If <symbol> is defined, then <any code> is compiled.<br/>
<div class="vsub"><a id="Examples"></a>Examples</div>
The following code will have a different output depending on how is application compiled:<br/>
<div class='code' style='position:relative;padding-right:16px;'>
<pre id='code_514'>
<span class="Statement"> if-defined</span> DEF1
<span class="Statement"> @</span>Defined
<span class="Statement"> end-defined</span>
<span class="Statement"> if-not-defined</span> DEF1
<span class="Statement"> @</span>Not defined
<span class="Statement"> end-defined</span></pre>
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<textarea id='golft_514' style='position: absolute;left: -500%;'></textarea>
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</div><br/>
If compiled with:<br/>
<div class="shcode" style='position:relative;padding-right:16px;'>
<pre id='code_513'>
gg <span class="Special">-q</span></pre>
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<textarea id='golft_513' style='position: absolute;left: -500%;'></textarea>
<img src='https://golf-lang.com/golf-copy-small-1.png' id='golfb' onclick='gg_copy(golft_513, code_513, golf_copied_513)' style='position:absolute;right:0;top:0; cursor: pointer;opacity:0.5;'/>
</div><br/>
then the output is:<br/>
<div class='ncode' style='position:relative;padding-right:16px;'>
<pre id='code_512'>
Not defined</pre>
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<textarea id='golft_512' style='position: absolute;left: -500%;'></textarea>
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</div><br/>
If compiled with:<br/>
<div class="shcode" style='position:relative;padding-right:16px;'>
<pre id='code_516'>
gg <span class="Special">-q</span> <span class="Special">--cflag</span><span class="Statement">=</span><span class="Statement">"</span><span class="Constant">-DDEF1</span><span class="Statement">"</span></pre>
<span id=golf_copied_516 style='position:absolute;right:-14px;top:-30px; cursor: pointer;visibility:hidden;background:white;'>Copied!</span>
<textarea id='golft_516' style='position: absolute;left: -500%;'></textarea>
<img src='https://golf-lang.com/golf-copy-small-1.png' id='golfb' onclick='gg_copy(golft_516, code_516, golf_copied_516)' style='position:absolute;right:0;top:0; cursor: pointer;opacity:0.5;'/>
</div><br/>
then the output is:<br/>
<div class='ncode' style='position:relative;padding-right:16px;'>
<pre id='code_515'>
Defined</pre>
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<textarea id='golft_515' style='position: absolute;left: -500%;'></textarea>
<img src='https://golf-lang.com/golf-copy-small-1.png' id='golfb' onclick='gg_copy(golft_515, code_515, golf_copied_515)' style='position:absolute;right:0;top:0; cursor: pointer;opacity:0.5;'/>
</div><br/>
<!--BEFSAL13--><div class="vsub"><a id="See also"></a>See also</div>
<a name='Program flow'></a><span style="font-weight:bold;">Program flow</span><br/>
<a href='https://golf-lang.com/break-loop.html'>break-loop</a> <br/>
<a href='https://golf-lang.com/code-blocks.html'>code-blocks</a> <br/>
<a href='https://golf-lang.com/continue-loop.html'>continue-loop</a> <br/>
<a href='https://golf-lang.com/do-once.html'>do-once</a> <br/>
<a href='https://golf-lang.com/exit-handler.html'>exit-handler</a> <br/>
<a href='https://golf-lang.com/if-defined.html'>if-defined</a> <br/>
<a href='https://golf-lang.com/if-true.html'>if-true</a> <br/>
<a href='https://golf-lang.com/return-handler.html'>return-handler</a> <br/>
<a href='https://golf-lang.com/set-bool.html'>set-bool</a> <br/>
<a href='https://golf-lang.com/start-loop.html'>start-loop</a> <br/>
<span style="font-weight:bold;">See all</span> <br/>
<a href='https://golf-lang.com/documentation.html'>documentation</a><br/>
<!--ENDVDOC90-->
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