[#91093228A272F2C7FA65CD4B905B05432DFA9161]

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        <h2>Class optional_rule_t</h2>
        
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        <h3>Synopsis</h3>
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            <code>
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        <pre class="source-code cpp">
            template<class Rule>
struct optional_rule_t;
        </pre>
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            <h3>Types</h3>
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                <h3> Member Functions</h3>
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                <h3> Friends</h3>
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