1变0,0变1。
let initialBits: UInt8 = 0b00001111let invertedBits = ~initialBits // equals 11110000$
全1得1,其他为0
let firstSixBits: UInt8 = 0b11111100let lastSixBits: UInt8 = 0b00111111let mIDdleFourBits = firstSixBits & lastSixBits // equals 00111100|
有1得1,其他为0
let someBits: UInt8 = 0b10110010let moreBits: UInt8 = 0b01011110let combinedbits = someBits | moreBits // equals 11111110^
相异为1,相同为0
let firstBits: UInt8 = 0b00010100let otherBits: UInt8 = 0b00000101let outputBits = firstBits ^ otherBits // equals 00010001<<和>>
<<整体左移,右边填0;
>> 整体右移,左边填0。
>" title="" src="http://img.blog.csdn.net/20151103111041263">let shiftBits: UInt8 = 4 // 00000100 in binaryshiftBits << 1 // 00001000shiftBits << 2 // 00010000shiftBits << 5 // 10000000shiftBits << 6 // 00000000shiftBits >> 2 // 00000001算子函数
上面讲解的都是简单的运算符,下面的是为对象添加运算符,使之可计算。
符号在中间struct Vector2D { var x = 0.0,y = 0.0}func + (left: Vector2D,right: Vector2D) -> Vector2D { return Vector2D(x: left.x + right.x,y: left.y + right.y)}let vector = Vector2D(x: 3.0,y: 1.0)let anotherVector = Vector2D(x: 2.0,y: 4.0)let combinedVector = vector + anotherVector// combinedVector is a Vector2D instance with values of (5.0,5.0)前缀和后缀
前缀关键字prefix
后缀关键字postfix
prefix func - (vector: Vector2D) -> Vector2D { return Vector2D(x: -vector.x,y: -vector.y)}let positive = Vector2D(x: 3.0,y: 4.0)let negative = -positive// negative is a Vector2D instance with values of (-3.0,-4.0)let alsoPositive = -negative// alsoPositive is a Vector2D instance with values of (3.0,4.0)复合赋值运算符
这里用+=举例。
func += (inout left: Vector2D,right: Vector2D) { left = left + right}var original = Vector2D(x: 1.0,y: 2.0)let vectorToAdd = Vector2D(x: 3.0,y: 4.0)original += vectorToAdd// original Now has values of (4.0,6.0)其他 参考资料
The Swift Programming Language (Swift 2.1)
文档修改记录时间 | 描述 |
---|---|
2015-11-1 | 根据 The Swift Programming Language (Swift 2.1)中的Classes and Structures总结 |
版权所有:http://blog.csdn.net/y550918116j
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