| author | stechong |
| Wed, 20 Oct 2010 11:19:31 -0500 | |
| changeset 2165 | 2a7b5eccb0bc |
| parent 1641 | 2b3996fc09a1 |
| permissions | -rw-r--r-- |
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"> |
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> |
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<head> |
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /> |
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<meta http-equiv="Content-Style-Type" content="text/css" /> |
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<meta name="LASTUPDATED" content="06/17/05 11:09:43" /> |
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<title>warn_implicitconv</title> |
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<link rel="StyleSheet" href="../../book.css" type="text/css"/> |
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</head> |
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10 |
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<body> |
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<h3>warn_implicitconv</h3> |
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<p> Controls the issuing of warnings for all implicit arithmetic conversions.</p> |
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<h5>Syntax</h5> |
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<p class="code">#pragma warn_implicitconv on | off | reset |
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</p> |
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<h5>Targets</h5> |
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All platforms.<br /> |
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<h5>Remarks</h5> |
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<p>If you enable this pragma, the compiler issues a warning for all implicit arithmetic conversions when the destination type might not represent the source value. Listing 10.40 provides an example.</p> |
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<div class="listing"> |
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<h4>Listing 10.40 Example of Implicit Conversion</h4> |
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<p>#pragma warn_implicitconv on // required to enable warnings<br /> |
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#pragma warn_impl_f2i_conv on // enable conversion warning<br /> |
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#pragma warn_impl_i2f_conv on // enable conversion warning<br /> |
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#pragma warn_impl_s2u_conv on // enable conversion warning </p> |
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<p>float f;<br /> |
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signed int si;<br /> |
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unsigned int ui;</p> |
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<p>int main()<br /> |
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{<br />
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f = si; // WARNING<br /> |
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si = f; // WARNING<br /> |
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ui = si; // WARNING<br /> |
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si = ui; // WARNING<br /> |
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}</p> |
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</div> |
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<p>For more information about this warning, see “Implicit Arithmetic Conversions”.</p> |
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<p class="note"><strong>NOTE</strong> This option “opens the gate” for the checking of implicit conversions. The sub-pragmas <a href="p_warn_impl_f2i_conv.htm">warn_impl_f2i_conv</a>, <a href="p_warn_impl_i2f_conv.htm">warn_impl_i2f_conv</a>, and <a href="p_warn_impl_s2u_conv.htm">warn_impl_s2u_conv</a> control the classes of conversions checked.</p> |
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<p>This pragma corresponds to the Implicit Arithmetic Conversions setting . To check this setting, use <span class="code">__option (warn_implicitconv)</span>, described in <a href="../symbols/sym_settings.htm">Checking Settings</a>. The default setting is <span class="code">off</span>.</p> |
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<p></p> |
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<div id="footer">Copyright © 2010 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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</body> |
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</html> |