在Swift中为自定义类重载等价(==)运算符 [英] Overloading equivalence (==) operator for custom class in Swift
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问题描述
是否可以为该自定义类中的自定义类重载等价(==)运算符。但是我知道可以让这个运算符在类范围外重载。感谢任何示例代码。
提前致谢。
Is it possible to overload equivalence (==) operator for a custom class inside that custom class. However I know that it is possible to have this operator overloaded outside class scope. Appreciate any sample code. Thanks in advance.
推荐答案
添加全局功能。例如:
class CustomClass {
var id = "my id"
}
func ==(lhs: CustomClass, rhs: CustomClass) -> Bool {
return lhs == rhs
}
func !=(lhs: CustomClass, rhs: CustomClass) -> Bool {
return !(lhs == rhs)
}
符合Swift 2中的Equatable协议
To conform Equatable protocol in Swift 2
class CustomClass: Equatable {
var id = "my id"
}
func ==(left: CustomClass, right: CustomClass) -> Bool {
return left.id == right.id
}
To符合Swift 3中的Equatable协议
To conform Equatable protocol in Swift 3
class CustomClass {
var id = "my id"
}
extension CustomClass: Equatable {
static func ==(lhs: CustomClass, rhs: CustomClass) -> Bool {
return lhs.id == rhs.id
}
}
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