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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">17.8 Example - Overloading Conversion
	Operators</font></h2>
<font size="+1">

Convert a <tt>Fraction</tt> to a <tt>double</tt>:

<blockquote><tt>
<pre>Fraction::operator double() const
{
   <font color="#0000cc">// Convert numerator to double, then do division</font>
   return static_cast&lt;double&gt;(top) / bottom;
}</pre></tt>
</blockquote>

Can be used:

<blockquote></tt>
<pre>Fraction a(1, 2);
double d = 7.0;
double halfd = d * a; <font color="#0000cc">// a is converted to double to do multiplication</font>
cout &lt;&lt; "one half seven is " &lt;&lt; halfd &lt;&lt; "\n";</pre></tt>
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