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<a name="id-1.3.32.9.11.12.4"></a><h2>Description</h2>
<p>Works the same way as the 'value&lt;bool&gt;' function, but the created <code class="computeroutput"><a class="link" href="value_semantic.html" title="Class value_semantic">value_semantic</a></code> won't accept any explicit value. So, if the option is present on the command line, the value will be 'true'. </p>
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