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我怎么才能扩展斯威夫特的Array<T>或T[]使用自定义功能实用程序输入?奇怪的是,SWIFT允许我用以下方式扩展一个非类型化数组: extension Array { for i in self{ }} 它让我用: [1,2,3].each(println) 但是我不能创建一个适当的泛型类型扩展,因为类型在通过方法时似乎丢失了to += t
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