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1013fe3c0cfd7582e94ef2d4bfd79da7ea1a1289 used to implement LWG2770, but cb0d4df97490ec2d2b1cdf7574d26b1bc4063599 made LWG2770 unimplemented again because of CWG2386. This patch re-implements LWG2770, while keeping the libc++-specific implementation strategy (which is controversial as noted in LWG4040). Drive-by: - Make the test coverage for the controversial part noted in LWG4040 libc++-only. - Add the previously missed entry for LWG2770 to the documentation.
libc++ Documentation ==================== The libc++ documentation is written using the Sphinx documentation generator. It is currently tested with Sphinx 1.1.3. To build the documents into html configure libc++ with the following cmake options: * -DLLVM_ENABLE_SPHINX=ON * -DLIBCXX_INCLUDE_DOCS=ON After configuring libc++ with these options the make rule `docs-libcxx-html` should be available. The documentation in this directory is published at https://libcxx.llvm.org. It is kept up-to-date by a build bot: https://lab.llvm.org/buildbot/#/builders/publish-sphinx-docs. If you notice that the documentation is not updating anymore, please contact one of the maintainers.