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苹果开发中文网站关于Swift中的指针的那些事
source link: http://www.cocoachina.com/ios/20190226/26419.html
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在Objective-c的世界中，一切对象都是指针。它是一种运行时语言，具体指针的对象类型将会在运行时，由系统分配。这样虽然自由，但是却并不安全。
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