opsis">Synopsis</a>
          </h7><pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">uint64_t</span>
<span class="identifier">as_uint64</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
</pre>
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            <span class="phrase"><a name="json.ref.boost__json__value.as_uint64.overload2.description"></a></span><a class="lin