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Re: [wg14/wg21 liaison] [isocpp-core] Ignorability of attributes: draft wording, and concern about __has_c_attribute

From: Herring, Davis <herring_at_[hidden]>
Date: Wed, 8 Feb 2023 19:31:47 +0000
>> I'm not sure why this is different from any other feature-test macro.
>> [...]
> What would be the use case for this?

Well, certainly some feature-test macros indicate the presence of significant portable functionality: __cpp_lib_ranges_iota, for example. It is equally certain that feature-test macros are of less value when they indicate the presence of things that do not have such portable functionality. Set against this is the questionable value that a "really does what I ask" test has in a context where "really" isn't very meaningful.


Received on 2023-02-08 19:31:50