div></div>
<p>
            Return the underlying <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">uint64_t</span></code>,
            or throw an exception.
          </p>
<h7><a name="json.ref.boost__json__value.as_uint64.overload2.h0"></a>
            <span class="phrase"><a name="json.ref.boost__json__value.as_uint64.overload2.synopsis"></a></span><a class="link" href="overload2.html#json.ref.boost__json__value.as_uint64.overload2.syn