笔记一 运算符重定义

struct CenterPointer{

    var x=0, y=0

}

func + (left:CenterPointer, right:CenterPointer) -> CenterPointer{

    return CenterPointer(x:left.x+right.y, y:left.y+right.y)

}

//

//let pointer1 = CenterPointer(x:2, y:3)

//let pointer2 = CenterPointer(x:4, y:5)

//let pointer3 = pointer1 + pointer2

//

//

//

//func == (left:CenterPointer, right:CenterPointer) -> Bool {

//    return (left.x == right.x) && (left.y == right.y)

//}

//

//func != (left:CenterPointer, right:CenterPointer) -> Bool {

//    return !(left == right)

//}

//

//

//print(pointer1 == pointer1)

//

//

func += (inout left:CenterPointer, right:CenterPointer){

    left = left + right

}

var pointer1 = CenterPointer(x:2, y:3)

var pointer2 = CenterPointer(x:4, y:5)

pointer1 += pointer2

最后

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