反初始化函数

//: Playground - noun: a place where people can play

import UIKit

//这里是一个反初始化函数操作的例子。

struct Bank {

static var coinsInBank = 10_000

func vendCoins(var numberOfCoinsToVend: Int) -> Int {

numberOfCoinsToVend = min(numberOfCoinsToVend,coinsInBank)

coinsInBank -= numberOfCoinsToVend

return numberOfCoinsToVend

}

func receiveCoins(coins: Int) {

coinsInBank += coins

}

}

class Player {

var coinsInPurse: Int

init(coins: Int) {

coinsInPurse = Bank.vendCoins(coins)

}

func winCoins(coins: Int) {

coinsInPurse += Bank.vendCoins(coins)

}

deinit {

Bank.receiveCoins(coinsInPurse)

}

}

var playerOne: Player? = Player(coins: 100)

playerOne?.coinsInPurse

Bank.coinsInBank

playerOne?.winCoins(2_000)

playerOne?.coinsInPurse

Bank.coinsInBank

playerOne = nil

Bank.coinsInBank

（编辑：李大同）

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