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总结： 1、类型约束只能添加到泛型参量上面 2、关联类型是泛型参量； 3、关联类型可以通过 协议.关联类型名称的形式引用； func allItemsMatch<C1: Container, C2: Container> (_ someContainer: C1, _ anotherContaine 阅读全文
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struct Degoo:Equatable { var lex:String var pex:String static func == (left:Degoo, right:Degoo) ->Bool{ return true } } func == (left:Degoo, right:Deg 阅读全文
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Starting from Swift 4.1, all you have to is to conform to the Equatable protocol without the need of implementing the == method. See: SE-0185 - Synthe 阅读全文
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Special Kinds of Methods Methods associated with a type rather than an instance of a type must be marked with the static declaration modifier for enum 阅读全文
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Operator Methods Classes and structures can provide their own implementations of existing operators. This is known as overloading the existing operato 阅读全文
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运算符：计算只依赖寄存器和cpu；运算符本身是指令集的一部分。对标表达式。 函数：以来栈帧和指令集。 运算符只能重载，不能自定义 阅读全文