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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?
FYI
代码清单14-8 增加成员值
enum TextAlignment {
case left
case right
case center
case justify
}
var alignment = TextAlignment.leftjustify
alignment = .right~~
...
注意,代码尽管还能运行,但是会输出错误的值。alignment变量设置为justify,但是switch语句打印了center aligned。这就是默认分支不面向未来的意思:这样做会增加未来修改代码的复杂度。
感觉这句话有问题(var alignment = TextAlignment.leftjustify
) 而且这段文字不知道要表达什么
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