在foreach中的C ++枚举 [英] C++ enum in foreach

问题描述

可能的重复项：

在C ++中枚举枚举

C ++：迭代枚举

对于具有以下枚举的二十一点游戏：

 枚举Rank {Ace，Two，Three，Four，Five，Six，八，九，十，杰克，女王，王}; 
 enum Suit {Clubs，Diamonds，Hearts，Spades}; 
  

当我创建套牌时，我想这样编写代码：

  // foreach Suit in Card :: Suit 
 // foreach卡中的排名:: Rank 
 //添加新卡，suit）to deck 
  

我相信在c ++中没有foreach。

解决方案

/ div>

通常向枚举添加元素以便于：

 枚举排名{
 Ace，Two，Three，Four，Five，Six，Seven，Eight，Nine，Ten，Jack，Queen，King，
 RankFirst = Ace，RankLast = King 
}; 
 enum Suit {
俱乐部，钻石，心，黑桃，
 SuitFirst =俱乐部，SuitLast =黑桃
}; 
  

然后你可以将你的循环写成：

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

Possible Duplicates:
Enumerate over an enum in C++
C++: Iterate through an enum

I've have a card class for a blackjack game with the following enums:

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

When I create the deck I want to write the code like this:

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

I believe there is no foreach in c++. However, how do I traverse an enum?

Thanks, Spencer

解决方案

It is common to add elements to the enum to facilitate this:

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
};

Then you can write your loops as:

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

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