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hidden enum constants (Was: Compiling GCC with g++: a report)
Zack Weinberg <zack@codesourcery.com> wrote:
>>> This doesn't do what I want at all. The goal is to make the *symbolic
>>> enumeration constants* inaccessible to most code.
>>
> ...
>> If it's OK to have the enums in a header, provided you can't *use*
them...
>>
>> enum {
>> #ifdef TVQ_AUTHORITATIVE_ENUMS
>> TVQ_FOO1,
>> TVQ_FOO2,
>> TVQ_FOO3,
>> TVQ_NUM_ENTRIES,
>> #endif
>> TVQ_INT_SIZER = 32767;
>> } TheValQuux;
>>
>> This won't stop a suitably enthusiastic programmer from getting to
>> them anyway, but that's always the case.
>
> Ooh, I like this one for enum machine_mode.
I think this is an ODR failure for C++ and I suspect program-at-a-time would
flag it with an error. So even this solution to hide enum constants (a
legitimate design request) does not appear to be C++ compatible to me.
--
Giovanni Bajo