On Wed, Jan 8, 2020 at 6:04 PM Billy O'Neal (VC LIBS) via Lib < [email protected]> wrote:
> No idea, I’m not saying I want to **use** the macro; I’m just adding a > test for the feature (as part of processing > https://github.com/microsoft/STL/pull/393 ) and making sure I didn’t miss > adding the correct macro. > There is no macro, so you didn't miss it ;) > > > Billy3 > > > > *From:* Barry Revzin <[email protected]> > *Sent:* Wednesday, January 8, 2020 5:48 PM > *To:* Library Working Group <[email protected]> > *Cc:* Billy O'Neal (VC LIBS) <[email protected]>; [email protected] > *Subject:* Re: [isocpp-lib] Is it intentional that P0357R3 "Supporting > Incomplete Types In reference_wrapper" has no feature test macro in N4842? > > > > On Thu, Jan 9, 2020, 9:15 AM Billy O'Neal (VC LIBS) via Lib < > [email protected]> wrote: > > http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1902r1.html > <https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.open-std.org%2Fjtc1%2Fsc22%2Fwg21%2Fdocs%2Fpapers%2F2019%2Fp1902r1.html&data=02%7C01%7Cbion%40microsoft.com%7C28169c61cdbe4a3e983f08d794a5fcd8%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637141312938668697&sdata=tqedXcGVyVjqcsRTLvQHkbKcNXtfzOlLQ2pGLj3Lbug%3D&reserved=0> > says “no macro necessary”. Should I take such attributions in that paper as > “SG6 looked at it and is OK with no macro”? > > > > Billy3 > > > > +SG10 (is it too late to rename our document to SD10 for consistency?) > > > > The paper just adds support for incomplete types to reference_wrapper. > What code would you write based on the presence of that feature? > A third-party library might choose to whether implement reference_wrapper with support for incomplete types or use std::reference_wrapper - to better interoperate with other code - on the basis of such a feature-test macro.
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