如何解决编译器枚举重新声明冲突

请考虑以下C++枚举:

enum Identity
{
    UNKNOWN   = 1,
    CHECKED   = 2,
    UNCHECKED = 3
};

enum Status
{
    UNKNOWN    = 0,
    PENDING    = 1,
    APPROVED   = 2,
    UNAPPROVED = 3
};

编译器将这两个UNKNOWN项冲突并抛出此错误:

错误:重新声明'UNKNOWN'

我能够解决这个错误改变的一个UNKNOWN来UNKNOWN_a,但我想不会更改名称.

如何在不更改enum项目名称的情况下解决此冲突？

您可以为此使用范围枚举.这需要C++ 11或更高版本的支持.

enum class Identity
{
       UNKNOWN = 1,
       CHECKED = 2,
       UNCHECKED =3
};

enum class Status
{
       UNKNOWN = 0,
       PENDING = 1,
       APPROVED = 2,
       UNAPPROVED =3
};

int main ()
{
    Identity::UNKNOWN;
    Status::UNKNOW;
}

Live Example