ass="identifier">std</span><span class="special">::</span><span class="identifier">wstring</span></code>
          when we know we have a <code class="computeroutput"><span class="keyword">wchar_t</span></code>.
          Otherwise there's a compile error as there's no overload for hashing the
          characters in wide strings (<a href="https://svn.boost.org/trac/boost/ticket/8552" target="_top">#8552</a>).
        </li>
</ul></div>
<h3>
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