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<h2><font color="#009999">17.1 Operator Overloading</font></h2>
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Avoid ambiguous behavior:
<blockquote>
<pre><i>some_return_type</i> operator+(Time a, Time b);</pre></blockquote>
<ul>
<li><tt>Time</tt> objects represent a point in time, not a
duration
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<li>what does 3 P.M. + 3 P.M. mean?</li>
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