[libc++] Complete the implementation of N4190

Fixes #37402

Reviewed By: ldionne

Spies: EricWF, avogelsgesang, libcxx-commits, arphaman

Differential Revision: https://reviews.llvm.org/D124346

[libc++] Use the same implementation of invoke for C++03 and C++11

Reviewed By: ldionne, #libc

Spies: libcxx-commits

Differential Revision: https://reviews.llvm.org/D127489

[libc++] Revert "Protect users from relying on detail headers" & related changes

This commit reverts 5aaefa51 (and also partly 7f285f48e77 and b6d75682f9,
which were related to the original commit).

[libc++] Revert "Protect users from relying on detail headers" & related changes

This commit reverts 5aaefa51 (and also partly 7f285f48e77 and b6d75682f9,
which were related to the original commit). As landed, 5aaefa51 had
unintended consequences on some downstream bots and didn't have proper
coverage upstream due to a few subtle things. Implementing this is
something we should do in libc++, however we'll first need to address
a few issues listed in https://reviews.llvm.org/D106124#3349710.

Differential Revision: https://reviews.llvm.org/D120683

show more ...

[libcxx][modules] protects users from relying on detail headers

libc++ has started splicing standard library headers into much more
fine-grained content for maintainability. It's very likely that ou

[libcxx][modules] protects users from relying on detail headers

libc++ has started splicing standard library headers into much more
fine-grained content for maintainability. It's very likely that outdated
and naive tooling (some of which is outside of LLVM's scope) will
suggest users include things such as <__ranges/access.h> instead of
<ranges>, and Hyrum's law suggests that users will eventually begin to
rely on this without the help of tooling. As such, this commit
intends to protect users from themselves, by making it a hard error for
anyone outside of the standard library to include libc++ detail headers.

Differential Revision: https://reviews.llvm.org/D106124

show more ...

[libc++] Normalize all our '#pragma GCC system_header', and regression-test.

Now we'll notice if a header forgets to include this magic phrase.

Differential Revision: https://reviews.llvm.org/D1188

[libc++] Normalize all our '#pragma GCC system_header', and regression-test.

Now we'll notice if a header forgets to include this magic phrase.

Differential Revision: https://reviews.llvm.org/D118800

show more ...

[libc++] Make C++03 reference_wrapper more like C++11.

Remove a bunch of LIBCPP_CXX03_LANG. This is the result of a
rabbithole to re-eliminate the workaround I introduced into
std::cref in D117953.

[libc++] Make C++03 reference_wrapper more like C++11.

Remove a bunch of LIBCPP_CXX03_LANG. This is the result of a
rabbithole to re-eliminate the workaround I introduced into
std::cref in D117953. It turns out that Clang's C++03 mode
(the only compiler we care about C++03 for) now supports all
the things we were originally eschewing via LIBCPP_CXX03_LANG;
we can fully support these reference_wrapper features in
C++03 mode, and un-XFAIL the relevant tests.

Drive-by constexprify a few more tests.

Differential Revision: https://reviews.llvm.org/D117974

show more ...

[libc++] [test] Fix LWG3146 "Excessive unwrapping in std::ref/cref"

Drive-by constexprify the existing tests, too.

Differential Revision: https://reviews.llvm.org/D117953

[libc++][NFC] Rename _EnableIf to __enable_if_t for consistency

In other places in the code, we use lowercase spelling for things that
are not available in prior standards.

Differential Revision: h

[libc++][NFC] Rename _EnableIf to __enable_if_t for consistency

In other places in the code, we use lowercase spelling for things that
are not available in prior standards.

Differential Revision: https://reviews.llvm.org/D109435

show more ...

[libc++] Remove workarounds for the lack of deduction guides in C++17

All supported compilers have supported deduction guides in C++17 for a
while, so this isn't necessary anymore.

Differential Rev

[libc++] Remove workarounds for the lack of deduction guides in C++17

All supported compilers have supported deduction guides in C++17 for a
while, so this isn't necessary anymore.

Differential Revision: https://reviews.llvm.org/D108213

show more ...

[libcxx][functional][modular] splices <functional> into modular headers

Differential Revision: https://reviews.llvm.org/D104942