Swift運算子函數與自訂運算子

標籤：

代碼：

struct Vector2D {    var x = 0.0, y = 0.0}// vector1 + vector2func + (left: Vector2D, right: Vector2D) -> Vector2D {    return Vector2D(x: left.x + right.x, y: left.y + right.y)}// vector1 - vector2func - (left: Vector2D, right: Vector2D) -> Vector2D {    return Vector2D(x: left.x - right.x, y: left.y - right.y)}// -vectorprefix func - (vector: Vector2D) -> Vector2D {    return Vector2D(x: -vector.x, y: -vector.y)}// vector1 += vector2func += (inout left: Vector2D, right: Vector2D) {    left = left + right}// vector1 -= vector2func -= (inout left: Vector2D, right: Vector2D) {    left = left - right}// ++vector1prefix func ++ (inout v: Vector2D) -> Vector2D {    v += Vector2D(x: 1, y: 1)    return v}// vector1++postfix func ++ (inout v: Vector2D) -> Vector2D {    v += Vector2D(x: 1, y: 1)    return v}// --vectorprefix func -- (inout v: Vector2D) -> Vector2D {    v += Vector2D(x: 1, y: 1)    return v}// vector--postfix func -- (inout v: Vector2D) -> Vector2D {    v += Vector2D(x: 1, y: 1)    return v}// vector1 == vector2func == (left: Vector2D, right: Vector2D) -> Bool {    return (left.x == right.x) && (left.y == right.y)}// vector1 != vector2func != (left: Vector2D, right: Vector2D) -> Bool {    return !(left == right)}// +++vectorprefix operator +++ {}prefix func +++ (inout vector: Vector2D) -> Vector2D {    vector += vector    return vector}// vector+++postfix operator +++ {}postfix func +++ (inout vector: Vector2D) -> Vector2D {    vector += vector    return vector}// vector1 +- vector2infix operator +- { associativity left precedence 140 }func +- (left: Vector2D, right: Vector2D) -> Vector2D {    return Vector2D(x: left.x + right.x, y: left.y - right.y)}// vector1 -+ vector2infix operator -+ { associativity left precedence 140 }func -+ (left: Vector2D, right: Vector2D) -> Vector2D {    return Vector2D(x: left.x - right.x, y: left.y + right.y)}

 

Swift運算子函數與自訂運算子