C++ 检查枚举标志

Question

在我的一个类中，我有一个整数来存储一组枚举标志，如下所示:

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

}

我想使用以下签名向我的 Attack 类添加一个方法

bool HasAttackFlags(int flags);

flags 将是许多 AttackFlags |'d 在一起。如果我只想检查一个标志，我可以将 & AtkFlags 和标志放在一起，但是因为我必须检查多个可能的标志，所以这行不通。如何正确检查多个标志？我想避免传递一个 vector/标志集来检查，因为简单地 |'ing 一组标志在一起比构造一个 vector/集更简单

提前致谢

编辑:

为了阐明我的意思，我可能有以下内容

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

然后，我想像这样检查 atk 上的标志:

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

res应该为真反之

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

应该为 false，因为 AtkFlags 不包含 Contact 和 Unreflectable。

Answer 1

我不确定我是否在关注您的问题，因为您似乎提到了显而易见的解决方案。那么这个解决方案有什么问题，显然添加你想要的任何额外标志:

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

编辑:哦......我想我刚刚弄明白了，你想检查是否有 2 个或更多标志作为一个集合？在这种情况下，您只需将方法修改为:

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