Question

可能重复：
  Enumerate over an enum in C++
  C++: Iterate through an enum

我有一个二十一点游戏的卡片类，其中包含以下枚举：

enum Rank { Ace, Two, Three, Four, Five, Six, Seven, Eight, Nine, Ten, Jack, Queen, King };
enum Suit { Clubs, Diamonds, Hearts, Spades };

当我创建套牌时，我想编写如下代码：

// foreach Suit in Card::Suit
//   foreach Rank in Card::Rank
//     add new card(rank, suit) to deck

我相信c ++中没有foreach。但是，我如何遍历枚举？

谢谢，斯潘塞

Answer 1

通常会向enum添加元素以促进此操作：

enum Rank {
    Ace, Two, Three, Four, Five, Six, Seven, Eight, Nine, Ten, Jack, Queen, King,
    RankFirst = Ace, RankLast = King
};
enum Suit {
    Clubs, Diamonds, Hearts, Spades,
    SuitFirst = Clubs, SuitLast = Spades
};

然后你可以把你的循环编写为：

for (int r = RankFirst; r <= RankLast; ++r) {
    for (int s = SuitFirst; s <= SuitLast; ++s) {
        deck.add(Card((Rank)r, (Suit)s));
    }
}

foreach中的C ++枚举

1 个答案: