[#3752AFA9A07EF9973B2A7F335BB5C0B4A5CBA871]

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        <h2>Function ref</h2>
        
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        <h3>Synopsis</h3>
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            <code>
                            </code>
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        <pre class="source-code cpp">
            template<class Rule>
constexpr
detail::rule_ref<Rule>
ref(Rule const& r) noexcept;
        </pre>
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