dimanche 24 juillet 2016

Long enum with bitwise

I've been facing a problem with my enum after getting past the 32nd flag:

enum ConditionType_t {
    CONDITION_NONE                          = 0,
    CONDITION_LIGHT                         = 1 << 0,
    CONDITION_INFIGHT                       = 1 << 1,
    CONDITION_MUTED                         = 1 << 2,
    ...
    CONDITION_LUCKY                         = 1 << 32,
}

Knowing that enums are basically 8bit, CONDITION_LUCKY will be equal to the CONDITION_NONE. So I implemented C++11's enum classes:

enum class ConditionType_t : uint64_t {
    CONDITION_NONE                          = 0,
    CONDITION_LIGHT                         = 1 << 0,
    CONDITION_INFIGHT                       = 1 << 1,
    CONDITION_MUTED                         = 1 << 2,
    ...
    CONDITION_LUCKY                         = 1 << 32,
}

Now I get millions of warnings like:

warning C4293: '<<' : shift count negative or too big, undefined behavior

And errors like:

error C2065: 'CONDITION_NONE' : undeclared identifier

Apparently, bit shifting doesn't get along with enum classes.

Any thoughts?

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