"computeroutput"><span class="keyword">char</span></code>
            or <code class="computeroutput"><span class="keyword">wchar_t</span></code> argument on its
            left or right (but not both). An operator may be overloaded if at least
            one of its parameters is a user-defined type. In this case, the <code class="computeroutput"><span class="identifier">double_</span></code> is the 2nd argument to <code class="computeroutput"><span class="keyword">operator</span><span class="special">&lt