Swift相等功能不起作用

Question

我想检查对象之间的相等性，但出现错误。错误在代码中。

class Test {
    var key: String

    init(nameParam: String) {
        self.key = nameParam
    }


    func ==(other: Test) -> Bool {
        return other.key == self.key
    }

}

var t1 = Test(nameParam: "Test")
var t2 = Test(nameParam: "Test1")

if(t1 == t2) { // Error: 'Test' is not convertible to 'MirrorDisposition'
    println("...")
}

Answer 1

操作符必须在全局范围内实现，而不是在类内部。所以你应该在类之外实现你的相等运算符：

class Test {...}

func == (lhs: Test, rhs: Test) -> Bool {
    return lhs.key == rhs.key
}

推荐阅读：Operator Functions

Answer 2

你应该这样写：

class Test : Equatable {
    var key: String

    init(nameParam: String) {
        self.key = nameParam
    }




}

func ==(lhs:Test,rhs: Test) -> Bool {
    return lhs.key == rhs.key
}

var t1 = Test(nameParam: "Test")
var t2 = Test(nameParam: "Test1")

if(t1 == t2) {
    println("...")
}