core/com.nokia.carbide.cpp.compiler.doc.user/html/pragmas/p_warn_resultnotused.htm
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<h3>warn_resultnotused</h3>
<p>Controls the issuing of warnings when function results are ignored.</p>
<h5>Syntax</h5>
<p class="code">#pragma warn_resultnotused on | off | reset </p>
<h5>Targets</h5>
All platforms.<br />
<h5>Remarks</h5>
<p>If you enable this pragma, the compiler issues a warning when it encounters a statement that calls a function without using its result. To prevent this, cast the statement with (void). Listing 10.45 provides an example.</p>
<div class="listing">
<h4>Listing 10.45 Example of Function Calls with Unused Results</h4>
<p>#pragma warn_resultnotused on </p>
<p>extern int bar();<br />
void foo()<br />
{<br />
bar(); // WARNING: result of function call is not used<br />
(void)bar(); // ‘void’ cast suppresses warning<br />
}</p>
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<p> For more information about this warning, see <a href="../errors/err_ignore_fn.htm">Ignored Function Results</a>.</p>
<p>This pragma does not correspond to any panel setting. To check this setting, use <span class="code">__option (warn_resultnotused)</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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