如何解决编译器枚举重声明冲突

问题描述

考虑以下 C++ 枚举:

Consider the following C++ enumerations:

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

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

编译器与 UNKNOWN 项发生冲突并抛出此错误:

The Compiler conflicted the both UNKNOWN items and threw this error:

错误:重新声明UNKNOWN"

error: redeclaration of 'UNKNOWN'

我能够解决此错误，将 UNKNOWN 之一更改为 UNKNOWN_a，但我不想更改名称.

I am able to solve this error changing one of the UNKNOWN to UNKNOWN_a, but I would like to do not change the names.

如何在不更改enum项名称的情况下解决此冲突?

How can I solve this conflict without changing the enum items name?

推荐答案

您可以使用 作用域枚举.这需要 C++11 或更高版本的支持.

You can use scoped enumerations for this. This requires C++11 or higher support.

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;
}

现场示例

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