[cfe-dev] Allowing '_' as version tuple separator?

[Douglas Gregor]

> On Sep 29, 2014, at 4:41 PM, jahanian <fjahanian at apple.com> wrote:
> 
> 
>> Hi All,
>> We have internal request to allow ‘_’ in addition to ‘.’ as version tuple separators.
>> So, in addition to 'major[.minor[.subminor]]’, proposal is to allow ‘major[_minor[_subminor]]’
>> as well. Is there a reason we shouldn’t do this?

There is some interaction with C++11 user-defined literals, because one can define (for example)

	unsigned long long operator "" _0(unsigned long long x) { return -x; }

which makes “10_0” produce the value -10. However, Parser::ParseVersionTuple is already doing custom parsing of the numeric constant, so I think we’re okay… but be sure to run all of your tests in C++11, C++03, and C to be sure that none of our workaround or UDL logic gets in the way.

	- Doug


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