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Subject: Re: Header unit importation syntax
From: Michael Spencer (bigcheesegs_at_[hidden])
Date: 2019-08-23 16:43:20


On Fri, Aug 23, 2019 at 2:13 PM Maris Razvan via Std-Discussion <
std-discussion_at_[hidden]> wrote:

> Hello,
>
> In the current C++ draft (august 2019), the grammar for a pp-import
> (http://eel.is/c++draft/cpp.import#nt:pp-import) allows for additional
> pp-tokens after the header-name or the header-name-tokens.
>
> The current version of that section is the result of P1703:
> "Recognizing Header Unit Imports Requires Full Preprocessing"
> (http://open-std.org/JTC1/SC22/WG21/docs/papers/2019/p1703r1.html).
> Before the changes caused by this proposal, the grammar still allowed
> for preprocessing tokens tokens after the header-name or the
> header-name-tokens, but in the form of a pp-import-suffix. (section
> [cpp.module] of P1103
> (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1103r3.pdf)).
>
> What is the reasoning behind allowing additional, unused preprocessing
> tokens in this context?
>
> Thank you.
> --
> Std-Discussion mailing list
> Std-Discussion_at_[hidden]
> https://lists.isocpp.org/mailman/listinfo.cgi/std-discussion

The reason is to allow attributes.

- Michael Spencer



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