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2014-06-14 23:24:20 +08:00
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chapter3/01_About_the_Language_Reference.html
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<div class="book" data-level="3.1" data-basepath=".." data-revision="1402750255397">
<div class="book" data-level="3.1" data-basepath=".." data-revision="1402759431779">
<div class="book-header">
<!-- Actions Left -->
<a href="#" class="btn pull-left toggle-summary" aria-label="Toggle summary"><i class="fa fa-align-justify"></i></a>
@ -587,11 +587,10 @@
<div class="page-inner">
<section class="normal" id="section-gitbook_83">
<section class="normal" id="section-gitbook_559">
<blockquote>
<p>翻译：ChildhoodAndy</p>
<p>校对：numbbbbb</p>
<p>翻译：ChildhoodAndy<br>校对：numbbbbb</p>
</blockquote>
<h1 id="-">关于语言附注</h1>
<hr>
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</ul>
<p>举个例子，getter-setter的语法块的定义如下：</p>
<blockquote>
<p>GRAMMAR OF A GETTER-SETTER BLOCK</p>
<p><em>getter-setter-block</em> → {­ <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/getter-clause" target="_blank"><em>getter-clause</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/setter-clause" target="_blank">­<em>setter-clause</em>­</a><em>opt</em> ­}­ | {­ <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/setter-clause" target="_blank"><em>setter-clause</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/getter-clause" target="_blank">­<em>getter-clause</em></a>­}­</p>
<p>GRAMMAR OF A GETTER-SETTER BLOCK<br><em>getter-setter-block</em> → {­ <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/getter-clause" target="_blank"><em>getter-clause</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/setter-clause" target="_blank">­<em>setter-clause</em>­</a><em>opt</em> ­}­ | {­ <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/setter-clause" target="_blank"><em>setter-clause</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/getter-clause" target="_blank">­<em>getter-clause</em></a>­}­</p>
</blockquote>
<p>这个定义表明，一个getter-setter方法​​块可以由一个getter子句后跟一个可选的setter子句构成，用大括号括起来，或者由一个setter子句后跟一个getter子句构成，用大括号括起来。上述的文法产生等价于下面的两个产生，明确阐明如何二中择一：</p>
<blockquote>
<p>GRAMMAR OF A GETTER-SETTER BLOCK</p>
<p>getter-setter-block → {­ <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/getter-clause" target="_blank"><em>getter-clause</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/setter-clause" target="_blank"><em>­setter-clause</em>­</a><em>opt</em> ­}­­</p>
<p>getter-setter-block → {­ <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/setter-clause" target="_blank"><em>setter-clause</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/getter-clause" target="_blank"><em>­getter-clause</em></a>­}­</p>
<p>GRAMMAR OF A GETTER-SETTER BLOCK<br>getter-setter-block → {­ <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/getter-clause" target="_blank"><em>getter-clause</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/setter-clause" target="_blank"><em>­setter-clause</em>­</a><em>opt</em> ­}­­<br>getter-setter-block → {­ <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/setter-clause" target="_blank"><em>setter-clause</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/getter-clause" target="_blank"><em>­getter-clause</em></a>­}­</p>
</blockquote>