[PATCH] D15421: [Feature] Add a builtin for indexing into parameter packs

[Richard Smith via cfe-commits]

On Wed, Jan 13, 2016 at 3:41 PM, Arthur O'Dwyer via cfe-commits <
cfe-commits at lists.llvm.org> wrote:

> Following Louis' suggestion, how about __pack_nth?
>

Maybe just __pack_element, to mirror its intended use to implement things
like tuple_element? (I'm not completely happy about using this general name
for something that only works for packs of types, but given that this
template produces a type, it's probably the best we can do.)


> On Wed, Jan 13, 2016 at 3:16 PM, Nathan Wilson via cfe-commits <
> cfe-commits at lists.llvm.org> wrote:
>
>>
>>
>> On Wed, Jan 13, 2016 at 4:52 PM, Richard Smith <richard at metafoo.co.uk>
>> wrote:
>>
>>> On Wed, Jan 13, 2016 at 2:31 PM, Nathan Wilson <nwilson20 at gmail.com>
>>> wrote:
>>>
>>>> nwilson added a comment.
>>>>
>>>> In http://reviews.llvm.org/D15421#326144, @rsmith wrote:
>>>>
>>>> > Bikeshedding on the name a bit... how about `__type_pack_element`?
>>>>
>>>> Hmm, I kind of felt like having `nth` in there implied we're indexing
>>>> into something... What about `__nth_pack_element`?
>>>
>>>
>>> Conversely, std::nth_element doesn't do indexing, and std::tuple_element
>>> does.
>>>
>>
>> Yeah, I was trying to combine them, but maybe that's misleading.
>>
>>
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