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📁 《Big C++ 》Third Edition电子书和代码全集-Part1

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<h2><font color="#009999">17.1&nbsp;&nbsp;Example - Operator
	Functions</font></h2>
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<ul>
	<li>The <i>difference</i> between two <tt>Time</tt> objects is the
		number of seconds between them
		<blockquote>
<pre>int operator-( Time a, Time b )
{
   return a.seconds_from( b );
}</pre>
		</blockquote>
	</li>

	<li>Use the <tt>-</tt> operator instead of calling <tt>seconds_from()</tt>:
		<blockquote>
<pre>Time now;
Time morning( 9, 0, 0 );
int seconds_elapsed = now - morning;</pre>
		</blockquote>
	</li>

	<li><tt>operator-</tt> is a nonmember function with two parameters</li>
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