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Swift 编程权威指南 第14章 递归枚举问题 #32

@yangyangnote

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@yangyangnote

在代码清单14-30 尝试定义FamilyTree 的代码后的第三段,提到ShapeDimensions实例的实际大小是17字节:足以装下rectangle的空间;ShapeDimensions实例的实际大小是17字节是从哪得出来的呢?

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