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core/com.nokia.carbide.cpp.compiler.doc.user/html/errors/err_ignore_fn.htm
author timkelly
Thu, 10 Dec 2009 13:45:47 -0600
branchRCL_2_4
changeset 671 80524b72f957
parent 0 fb279309251b
child 1641 2b3996fc09a1
permissions -rw-r--r--
Add S60 5.2 support.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"><html>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
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<meta name="LASTUPDATED" content="06/17/05 11:09:43" />
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<title>Ignored Function Results</title>
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<link rel="StyleSheet" href="../../book.css" type="text/css"/>
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<h3> Ignored Function Results</h3>
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<p>  If you enable the pragma <a href="../pragmas/p_warn_resultnotused.htm">warn_resultnotused</a>, the compiler issues a warning when it encounters a statement that calls a function without using its result. To prevent this warning, cast the statement with (void). See Listing 6.13 for an example.</p>
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<div class="listing">
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  <h5>Listing 6.13 Example of Pragma warn_resultnotused</h5>
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  <p>#pragma warn_resultnotused on<br />
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    void foo(int a,int b)<br />
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    {<br />
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    bar(); // warning: result of bar() is not used<br />
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    (void)bar(); // void cast suppresses warning<br />
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    }<br />
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  </p>
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</div>
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<div id="footer">Copyright &copy; 2009 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. <br>License: <a href="http://www.eclipse.org/legal/epl-v10.html">http://www.eclipse.org/legal/epl-v10.html</a></div>
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FCL/sftools/dev/ide/carbidecpp