update 03/07
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<div class="book" data-level="2.8" data-basepath=".." data-revision="1402267410054">
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<div class="book" data-level="2.8" data-basepath=".." data-revision="1402287112409">
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<div class="book-header">
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<!-- Actions Left -->
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<a href="#" class="btn pull-left toggle-summary" aria-label="Toggle summary"><i class="fa fa-align-justify"></i></a>
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<div class="page-inner">
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<section class="normal" id="section-gitbook_25">
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<section class="normal" id="section-gitbook_57">
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<h1 id="-">枚举</h1>
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<p>本页内容包含:</p>
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</code></pre><p><code>directionToHead</code>的类型被推断当它被<code>CompassPoint</code>的一个可能值初始化。一旦<code>directionToHead</code>被声明为一个<code>CompassPoint</code>,你可以使用更短的点(.)语法将其设置为另一个<code>CompassPoint</code>的值:</p>
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<pre><code>directionToHead = .East
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</code></pre><p><code>directionToHead</code>的类型已知时,当设定它的值时,你可以不再写类型名。使用显示类型的枚举值可以让代码具有更好的可读性。</p>
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<h2 id="-switch-">匹配枚举值和<code>Switch</code>语句</h2>
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<h2 id="-switch-">用<code>Switch</code>语句匹配枚举值</h2>
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<p>你可以匹配单个枚举值和<code>switch</code>语句:</p>
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<pre><code>directionToHead = .South
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switch directionToHead {
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