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（复习一下）向量a， n, b, cb为a在a上的投影a与b夹角为zb = n*(b/n)cos z = b/ab = cosz*ab = n*(cosz*a/n)b =n*(cosz*a*n/n*n)b = n*(a.n/n*n)c = a - ba.b = a*b*cosZz = arccos ... 阅读全文
posted @ 2014-06-04 20:45
summernight
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protocol Container { typealias ItemType mutating func append(item: ItemType) mutating func removelast() -> ItemType var count: Int {get} ... 阅读全文
posted @ 2014-06-04 17:28
summernight
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class Arctest { let name: String = "Arctest" @lazy var ret:() -> String? = { [weak self] in return self!.name } @lazy va... 阅读全文
posted @ 2014-06-04 14:59
summernight
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```cppenum Iter: Int{ case s1=0, s2, s3, s4 mutating func next(){ if self == .s4 { self = .s1 return } ... 阅读全文
posted @ 2014-06-04 11:45
summernight
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