Created on 2020-01-25.00:00:00 last changed 38 months ago
Proposed resolution:
This wording is relative to N4849.
Modify [cpp.predefined], Table [tab:cpp.predefined.ft], as indicated:
Table 18: Feature-test macros [tab:cpp.predefined.ft] Macro name Value […] __cpp_impl_coroutine s201902L […]
Modify [version.syn], header <version> synopsis, as indicated:
[…] #define __cpp_lib_constexpr_vector 201907L // also in <vector> #define __cpp_lib_coroutine 201902L // also in <coroutine> #define __cpp_lib_destroying_delete 201806L // also in <new> […]
[ 2020-02 Moved to Immediate on Tuesday in Prague. ]
[ 2020-02-11, Prague ]
LWG observed that the naming suggestion didn't follow naming conventions of SG-10 because of the plural form corountines. The submitter agreed with that complaint, so the revised wording uses now the singular form.
We have a policy, established in P1353 (and needing to be added to SD-6):
In some cases a feature requires two macros, one for the language and one for the library. For example, the library does not want to define its three-way comparison operations unless the compiler supports the feature. For end-users, it is suggested that they test only the library macro, as that will only be true if the language macro is also true. As a result, the language macros contain "impl" to distinguish them from the more general version that is expected to be set by the library. That paper added two papers of macros: one for <=> and one for destroying delete. We have a third such example in coroutines: there is library machinery that needs to be provided only when the compiler has language support for it, and the end user should just check the library macro.Previous resolution [SUPERSEDED]:
This wording is relative to N4849.
Modify [cpp.predefined], Table [tab:cpp.predefined.ft], as indicated:
Table 18: Feature-test macros [tab:cpp.predefined.ft] Macro name Value […] __cpp_impl_coroutines 201902L […] Modify [version.syn], header <version> synopsis, as indicated:
[…] #define __cpp_lib_constexpr_vector 201907L // also in <vector> #define __cpp_lib_coroutines 201902L // also in <coroutine> #define __cpp_lib_destroying_delete 201806L // also in <new> […]
| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2021-02-25 10:48:01 | admin | set | status: wp -> c++20 |
| 2020-02-24 16:02:59 | admin | set | status: immediate -> wp |
| 2020-02-12 03:28:55 | admin | set | messages: + msg11044 |
| 2020-02-12 03:28:55 | admin | set | status: new -> immediate |
| 2020-02-11 12:33:15 | admin | set | messages: + msg11038 |
| 2020-02-09 19:45:23 | admin | set | messages: + msg11004 |
| 2020-01-25 00:00:00 | admin | create | |