swift - The Prototype Pattern

import Foundation

class Sum : NSObject,NSCopying {

var resultsCache: [[Int]];

var firstValue:Int;

var secondValue:Int;

init(first:Int,second:Int) {

resultsCache = [[Int]](count: 10,repeatedValue:

[Int](count:10,repeatedValue: 0));

for i in 0..<10 {

for j in 0..<10 {

resultsCache[i][j] = i + j;

}

}

self.firstValue = first;

self.secondValue = second;

}

private init(first:Int,second:Int,cache:[[Int]]) {

self.firstValue = first;

self.secondValue = second;

resultsCache = cache;

}

var Result:Int {

get {

return firstValue < resultsCache.count

&& secondValue < resultsCache[firstValue].count

? resultsCache[firstValue][secondValue]

: firstValue + secondValue;

}

}

func copyWithZone(zone: NSZone) -> AnyObject {

return Sum(first:self.firstValue,

second: self.secondValue,

cache: self.resultsCache);

}

}

var prototype = Sum(first:0,second:9);

var calc1 = prototype.Result;

var clone = prototype.copy() as! Sum;

clone.firstValue = 3; clone.secondValue = 8;

var calc2 = clone.Result;

println("Calc1: (calc1) Calc2: (calc2)");

（编辑：李大同）

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