It’s a relief. Good to know. Thanks Joe. > On Dec 31, 2015, at 11:32 AM, Joe Groff <jgr...@apple.com> wrote: > > >> On Dec 30, 2015, at 7:42 PM, Ling Wang <an0...@gmail.com> wrote: >> >> Yes I’m submitting patches to stdlib. Thanks for pointing me to the doc >> folder. > > Even if you're working on the stdlib, I wouldn't worry too much about using > any internal attributes right away. The performance team usually handles > adding those where needed. > > -Joe > >>> On Dec 30, 2015, at 7:35 PM, Joe Groff <jgr...@apple.com> wrote: >>> >>> >>>> On Dec 30, 2015, at 4:58 PM, Ling Wang via swift-dev <swift-dev@swift.org> >>>> wrote: >>>> >>>> I want to submit some patches but I’m not sure whether I should apply some >>>> @_attributes(like @_transparent and @_semantics) that I see in stdlib to >>>> my API because I don’t know their meanings. >>> >>> If it starts with an underscore, the answer is always "no, unless you're >>> the standard library". These attributes are compiler-internal and not >>> intended to be used by user code. We reserve the right to change them with >>> reckless abandon. >>> >>>> Where are they documented? >>> >>> Some are documented in the compiler's 'doc/' subdirectory in various places. >>> >>> -Joe >> >
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