[libcxx-commits] [PATCH] D91292: [libc++] [P0935] [C++20] Eradicating unnecessarily explicit default constructors from the standard library.
Louis Dionne via Phabricator via libcxx-commits
libcxx-commits at lists.llvm.org
Tue Dec 8 09:40:49 PST 2020
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In D91292#2440252 <https://reviews.llvm.org/D91292#2440252>, @tcanens wrote:
> LWG doesn't do official DRs like ever,
I'm not sure I follow. Aren't all LWG issues considered DRs and "back applied" to earlier standards, hence what we do in the libraries wrt LWG issues?
> so cppreference policy for the library is that we look at what implementations do (or make an educated guess/prediction about what they will do) to call things "DRs". We are trying to document things for programmers, not standard archaeologists or language lawyers.
I think it's misleading to call it a DR if it isn't one. I believe it would be more correct (and equally useful) to say that most implementations support it back in C++11, without using the word DR. It's a bit pedantic, but I think nothing is lost by being more precise.
> Both libstdc++ and MSVC implement P0935 unconditionally, so I suspect that I guessed correctly for this case.
@curdeius In that case, I believe we should support it unconditionally as well. At worst, it's a very very small extension in older standards. That'll also simplify the implementation and the tests a bit.
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