special">::</span><span class="identifier">size_t</span> <span class="identifier">pos</span><span class="special">);</span>
</pre>
<h7><a name="json.ref.boost__json__string.at.overload1.h1"></a>
            <span class="phrase"><a name="json.ref.boost__json__string.at.overload1.description"></a></span><a class="link" href="overload1.html#json.ref.boost__json__string.at.overload1.description">Description</a>
          </h7><p>
            Returns a reference to the character specified at location <code class