C ++检查枚举标志 [英] C++ checking enum flags

问题描述

在我的一个类中，我有一个整数，存储一组枚举标志，如：

 枚举AttackFlags 
 {
 Contact = 1，//移动与目标连接
 Projectile = 2，//攻击是基于弹子的
 Unblockable = 4，//攻击不能被阻止
 UncounterableLv1 = 8，//攻击不能被反击除非极端的反攻击技能/状态效果
 UncounterableLv2 = 16，//攻击不能被反击
 Flinches = 32，//有机会眩晕敌人，推回他们的下一个回合
 Unreflectable = 64，//攻击渗透反射。只检查魔法攻击
 IgnoreDefenderStatusEffects = 128，//忽略防御者的活动状态效果
 IgnoreAttackerStatusEffects = 256，//忽略攻击者的活动状态效果
 IgnoreDefenderAbilities = 512，// Ignore防御者的能力
 IgnoreAttackerAbilities = 1024，//忽略攻击者的能力
 IgnoreArmorRating = 2048，//忽略装甲的防御提升
 IgnoreWeaponRating = 4096，//忽略来自武器的攻击提升b $ b HighCritical = 8192，//移动碰撞的机会增加
 CausesStatus = 16384，//移动会导致状态效果吗？ 
 Elemental = 32768，//移动基于元素吗？ 
未实现= 65536，//移动已经实现了吗？ 
 ModsTimer = 131072，//它对目标或用户计时器有影响吗？ 
 Heals = 262144，//动作是否愈合？ 
 SecondaryEffects = 524288，//攻击除了基本攻击之外还有额外的影响
 PhysicalAttackFlag = 1048576，//是否是基于物理的类？ I.E.被保护和屏蔽
 MagicAttackFlag = 2097152，//是移动Magically Based吗？ I.E.它是受壳的影响
 MultiHit = 4194304，//它包装多于1命中
 SingleUse = 8388608，//攻击只能每次战斗使用一次
 DoesNotCauseDamage = 16777216 
}; 
 
类攻击
 {
 int AtkFlags; // Stores AttackFlags |'d together 
 
} 
  

添加一个方法到我的Attack类中，具有以下签名

  bool HasAttackFlags 
  

标志将是众多AttackFlags |'。如果我只想检查一个标志，我可以只是& AtkFlags和flags在一起，但因为我必须检查多个可能的标志，这将不工作。如何正确检查多个标志？我想避免传递一个向量/集合的标志来检查一个简单的一组标志在一起更简单，然后构建一个向量/集

谢谢

要澄清我的意思，我可能会有以下

 攻击atk; 
 atk.AtkFlags =联系我们射弹|治愈| MagicAttackFlag; 
  

然后，我想检查atk上的标志，如下：

  bool res = atk.HasAttackFlags（Contact | Projectile）; 
  

res应为true，反之亦然。

  bool res = atk.HasAttackFlags（Contact | Unreflectable）; 
 

应该为false，因为AtkFlags不包含两者。Contact adn Unreflectable。

解决方案

我不确定我是否关注你的问题，因为你似乎提到了明显的解决方案。所以这是一个解决方案是错误的，显然添加任何额外的标志你希望：

  bool HasAttackFlags b $ b return（flags&（contact | projectile））！= 0; 
} 
  

编辑：哦...我想我只是想出来，想要检查是否存在2个或更多的标志作为集合？在这种情况下，您可以简单地将方法修改为：

  bool HasAttackFlags（int flags）{
 return（flags& （contact | projectile））==（contact | projectile）; 
} 
  




In one of my classes, I have an integer that stores a set of enum flags like so:

enum AttackFlags
{
    Contact = 1,                        //Move connects with target
    Projectile = 2,                         //Attack is projectile based
    Unblockable = 4,                        //Attack can not be blocked
    UncounterableLv1 = 8,                   //Attack can't be countered except by extreme counter attack skills/status effects
    UncounterableLv2 = 16,                  //Attack can not be countered
    Flinches = 32,                          //Has a chance to stun the enemy, pushing back their next turn
    Unreflectable = 64,                     //Attack penetrates reflect. Only checked for Magic attacks
    IgnoreDefenderStatusEffects = 128,      //Ignores active status effects on the defender
    IgnoreAttackerStatusEffects = 256,      //Ignores active status effects on the attacker
    IgnoreDefenderAbilities = 512,          //Ignore the defenders abilities
    IgnoreAttackerAbilities = 1024,         //Ignore the attackers abilities
    IgnoreArmorRating = 2048,               //Ignore the defensive boosts of armor
    IgnoreWeaponRating = 4096,              //Ignore the attack boost from weapons
    HighCritical = 8192,                    //The move has an increased chance to crit
    CausesStatus = 16384,                   //Can the move cause status effects?
    Elemental = 32768,                      //Is the move elemental based?
    Unimplemented = 65536,                  //has the move been implemented yet?
    ModsTimer = 131072,                     //Does it have an effect on the target or users timer?
    Heals = 262144,                         //Does the move heal?
    SecondaryEffects = 524288,              //Attack has additional effects besides basic attack
    PhysicalAttackFlag = 1048576,           //Is the Class Physically based? I.E. blocked by Protect and Shield
    MagicAttackFlag = 2097152,              //Is the move Magically Based? I.E. is it affected by things like Shell
    MultiHit = 4194304,                     //Does it enxcapsulate more then 1 hit
    SingleUse = 8388608,                    //Attack can only be used once per battle
    DoesNotCauseDamage = 16777216
};

class Attack
{
   int AtkFlags; //Stores AttackFlags |'d together

}

I'd like to add a method to my Attack class with the following signature

bool HasAttackFlags(int flags);

flags would be numerous AttackFlags |'d together. If I only wanted to check against a single flag, I could just & AtkFlags and flags together, but because I have to check against multiple possible flags this won't work. How can I properly check for multiple flags? I'd like to avoid passing a vector/set of flags to check against as simply |'ing a set of flags together is simpler then constructing a vector/set

Thanks in advance

EDIT:

To clarify what I mean, I might have the following

Attack atk;
atk.AtkFlags = Contact | Projectile | Heals | MagicAttackFlag;

Then later, I'd want to check the flags on atk like so:

bool res = atk.HasAttackFlags(Contact | Projectile);

res should be true and conversely

bool res = atk.HasAttackFlags(Contact | Unreflectable);

should be false becase AtkFlags does not contain both Contact adn Unreflectable.

解决方案

I am not sure I am following your question, because you seem to mention the obvious solution. So what is wrong with this as a solution, obviously add whatever additional flags you wish:

bool HasAttackFlags(int flags) {
    return (flags&(contact|projectile))!=0;
}

EDIT: Oh... I think I just figured it out, do you want to check for the presence of 2 or more flags as a set? In which case you can simply modify the method to:

bool HasAttackFlags(int flags) {
    return (flags&(contact|projectile))==(contact|projectile);
}

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