slide017.html

来自「《Big C++ 》Third Edition电子书和代码全集-Part1」· HTML 代码 · 共 55 行

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<h2><font color="#009999">18.3.3 Copy Constructors (cont.)</font></h2>
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Invoked:
<ul>
	<li>Explicitly
		<blockquote>
			String first("Fred");<br>
			String second(first);
			<font color="#0000cc">// second is initialized from first using copy
				constructor</font></tt>
		</blockquote>
	</li>
	<li>During initialization using <tt>=</tt></li>
		<blockquote>
			String third = first;
			<font color="#0000cc">// Also uses copy constructor</font></tt>
		</blockquote>
	</li>
	<li>When an object is passed <i>by value</i></li>
		<ul>
			<li><font color="#009999"><b>Note:</b></font> Use <tt>const</tt> when
				passing a reference to avoid copy overhead</li>
		</ul>
</ul>

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