C# 給CardUb添加運(yùn)算符重載
首先給Card類添加額外字段,允許使用“王牌”花色,使A有更高的級(jí)別。把這些字段指定為靜態(tài),因?yàn)樵O(shè)置它們后,它們就可以應(yīng)用到所有Card對(duì)象上:
public class Card
{
/// <suxnmary>
/// Flag for trump usage. If true, trumps are valued higher
/// than cards of other suits.
/// </summary>
public static bool useTrumps = false;
/// <summary>
/// Trump suit to use if useTrumps is true.
/// </summary>
public static Suit trump = Suit.Club;
/// <sumraary>
/// Flag that determines whether aces are higher than kings or lower
/// than deuces,
/// </sunuuary>
public static bool isAceHigh = true;
這些規(guī)則應(yīng)用于應(yīng)用程序中每個(gè)Deck的所有Card對(duì)象上?因此,兩個(gè)Deck中的Card不可能遵守不同規(guī)則。這適用于這個(gè)類庫,但是確實(shí)可以做出這樣的假設(shè):如果一個(gè)應(yīng)用程序要使用不同的規(guī)則,可以自行維護(hù)這些規(guī)則;例如,在切換牌時(shí),設(shè)置Card的靜態(tài)成員。
完成后,就要給Deck類再添加幾個(gè)構(gòu)造函數(shù),以便用不同的特性來初始化撲克牌:
/// <summary>
/// Nondefault constructor. Allows aces to be set high.
/// </summary>
public Deck{bool isAceHigh) : this()
{
Card.isAceHigh = isAceHigh;
}
/// <summary>
/// Nondefault constructor. Allows a trump suit to be used.
/// </sununary>
public Deck(bool useTrumps, Suit trump) : this()
{
Card.useTrumps = useTrumps;
Card.trump = trump;
}
/// <summary>
/// Nondefault constructor. Allows aces to be set high and a trump suit
/// to be used.
/// </suirunary>
public Deck(bool isAceHigh, bool useTrumps, Suit trump) : this()
{
Card.isAceHigh = isAceHigh;
Card.useTrumps = useTrumps;
Card.trump = trump;
}
每個(gè)構(gòu)造函數(shù)都使用:this()語法來定義,這樣,無論如何,默認(rèn)構(gòu)造函數(shù)總會(huì)在非默認(rèn)的構(gòu)造函數(shù)之前被調(diào)用,以初始化撲克牌。
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