c++ 将枚举值标记为已弃用?

2021-12-29 00:00:00 enums deprecated c++

是否可以将枚举值标记为已弃用?

Is it possible to mark an enum value as deprecated?

例如

enum MyEnum {
    firstvalue = 0
    secondvalue,
    thirdvalue, // deprecated
    fourthvalue
};

二等奖的解决方案是 ifdef MSVC 和 GCC 解决方案.

A second prize solution would be to ifdef a MSVC and a GCC solution.

推荐答案

你可以这样做:

enum MyEnum {
    firstvalue = 0,
    secondvalue,
    thirdvalue, // deprecated
    fourthvalue
};
#pragma deprecated(thirdvalue)

然后每当使用该变量时，编译器将输出以下内容:

then when ever the variable is used, the compiler will output the following:

warning C4995: 'thirdvalue': name was marked as #pragma deprecated

编辑
这看起来有点 hacky，我没有 GCC 编译器来确认(有人可以为我做这件事吗?)但它应该可以工作:

EDIT
This looks a bit hacky and i dont have a GCC compiler to confirm (could someone do that for me?) but it should work:

enum MyEnum {
    firstvalue = 0,
    secondvalue,
#ifdef _MSC_VER
    thirdvalue,
#endif
    fourthvalue = secondvalue + 2
};

#ifdef __GNUC__
__attribute__ ((deprecated)) const MyEnum thirdvalue = MyEnum(secondvalue + 1);
#elif defined _MSC_VER
#pragma deprecated(thirdvalue)
#endif

这是我的回答和 MSalters 的回答的结合

it's a combination of my answer and MSalters' answer

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