[libc++][C++03] Use `__cxx03/` headers in C++03 mode (#109002)

This patch implements the forwarding to frozen C++03 headers as
discussed in
https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-

[libc++][C++03] Use `__cxx03/` headers in C++03 mode (#109002)

This patch implements the forwarding to frozen C++03 headers as
discussed in
https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc. In the
RFC, we initially proposed selecting the right headers from the Clang
driver, however consensus seemed to steer towards handling this in the
library itself. This patch implements that direction.

At a high level, the changes basically amount to making each public
header look like this:

```
// inside <vector>
#ifdef _LIBCPP_CXX03_LANG
# include <__cxx03/vector>
#else
// normal <vector> content
#endif
```

In most cases, public headers are simple umbrella headers so there isn't
much code in the #else branch. In other cases, the #else branch contains
the actual implementation of the header.

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[libc++] Add #if 0 block to all the top-level headers (#119234)

Including The frozen C++03 headers results in a lot of formatting
changes in the main headers, so this splits these changes into a
sep

[libc++] Add #if 0 block to all the top-level headers (#119234)

Including The frozen C++03 headers results in a lot of formatting
changes in the main headers, so this splits these changes into a
separate commit instead.

This is part of
https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc.

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[libc++] Remove get_temporary_buffer and return_temporary_buffer (#100914)

Works towards P0619R4 / #99985.

The use of `std::get_temporary_buffer` and `std::return_temporary_buffer`
are replaced

[libc++] Remove get_temporary_buffer and return_temporary_buffer (#100914)

Works towards P0619R4 / #99985.

The use of `std::get_temporary_buffer` and `std::return_temporary_buffer`
are replaced with `unique_ptr`-based RAII buffer holder.

Escape hatches:
- `_LIBCPP_ENABLE_CXX20_REMOVED_TEMPORARY_BUFFER` restores
`std::get_temporary_buffer` and `std::return_temporary_buffer`.

Drive-by changes:
- In `<syncstream>`, states that `get_temporary_buffer` is now removed,
because `<syncstream>` is added in C++20.

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[libc++] Makes `unique_ptr operator*() noexcept. (#98047)

This implements
- LWG2762 unique_ptr operator*() should be noexcept.

Differential Revision: https://reviews.llvm.org/D128214

[libc++][memory] P1132R8: `out_ptr` - a scalable output pointer abstraction (#73618)

Differential Revision: https://reviews.llvm.org/D150525

Implements:
- https://wg21.link/P1132R8 - `out_ptr` -

[libc++][memory] P1132R8: `out_ptr` - a scalable output pointer abstraction (#73618)

Differential Revision: https://reviews.llvm.org/D150525

Implements:
- https://wg21.link/P1132R8 - `out_ptr` - a scalable output pointer
abstraction
- https://eel.is/c++draft/smartptr.adapt - 20.3.4 Smart pointer adaptors
- https://wg21.link/LWG3734 - Inconsistency in `inout_ptr` and `out_ptr`
for empty case
- https://wg21.link/LWG3897- `inout_ptr` will not update raw pointer to
0

---------

Co-authored-by: Hristo Hristov <zingam@outlook.com>

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[libc++] Include the rest of the detail headers by version in the umbrella headers (#96032)

This is a follow-up to #83740.

[libc++] Undeprecate shared_ptr atomic access APIs (#92920)

This patch reverts 9b832b72 (#87111):
- [libc++] Deprecated `shared_ptr` Atomic Access APIs as per P0718R2
- [libc++] Implemented P2869R

[libc++] Undeprecate shared_ptr atomic access APIs (#92920)

This patch reverts 9b832b72 (#87111):
- [libc++] Deprecated `shared_ptr` Atomic Access APIs as per P0718R2
- [libc++] Implemented P2869R3: Remove Deprecated `shared_ptr` Atomic Access APIs from C++26

As explained in [1], the suggested replacement in P2869R3 is `__cpp_lib_atomic_shared_ptr`,
which libc++ does not yet implement. Let's not deprecate the old way of doing things before
the new way of doing things exists.

[1]: https://github.com/llvm/llvm-project/pull/87111#issuecomment-2112740039

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[libc++] Deprecated `shared_ptr` Atomic Access APIs as per P0718R2 & Implemented P2869R3: Remove Deprecated `shared_ptr` Atomic Access APIs from C++26 (#87111)

Implements https://wg21.link/P2869R4

[libc++] Deprecated `shared_ptr` Atomic Access APIs as per P0718R2 & Implemented P2869R3: Remove Deprecated `shared_ptr` Atomic Access APIs from C++26 (#87111)

Implements https://wg21.link/P2869R4
Implements deprecations as per https://wg21.link/P0718R2

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[libc++] Clean up includes of <__assert> (#80091)

Originally, we used __libcpp_verbose_abort to handle assertion failures.
That function was declared from all public headers. Since we don't use
th

[libc++] Clean up includes of <__assert> (#80091)

Originally, we used __libcpp_verbose_abort to handle assertion failures.
That function was declared from all public headers. Since we don't use
that mechanism anymore, we don't need to declare __libcpp_verbose_abort
from all public headers, and we can clean up a lot of unnecessary
includes.

This patch also moves the definition of the various assertion categories
to the <__assert> header, since we now rely on regular IWYU for these
assertion macros.

rdar://105510916

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[libc++][memory] P2652R2: Disallow Specialization of `allocator_traits` (#79978)

Implements P2652R2 <https://wg21.link/P2652R2>:
- https://eel.is/c++draft/allocator.requirements.general
- https://

[libc++][memory] P2652R2: Disallow Specialization of `allocator_traits` (#79978)

Implements P2652R2 <https://wg21.link/P2652R2>:
- https://eel.is/c++draft/allocator.requirements.general
- https://eel.is/c++draft/memory.syn
- https://eel.is/c++draft/allocator.traits.general
- https://eel.is/c++draft/allocator.traits.members
- https://eel.is/c++draft/diff.cpp20.concepts
- https://eel.is/c++draft/diff.cpp20.utilities

---------

Co-authored-by: Zingam <zingam@outlook.com>

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[libc++][memory] P2868R1: Removing deprecated typedef `std::allocator::is_always_equal` (#78562)

Implements:
- https://wg21.link/P2868R1
- https://wg21.link/LWG3170

---------

Co-authored-by:

[libc++][memory] P2868R1: Removing deprecated typedef `std::allocator::is_always_equal` (#78562)

Implements:
- https://wg21.link/P2868R1
- https://wg21.link/LWG3170

---------

Co-authored-by: Zingam <zingam@outlook.com>

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[libc++] Deprecates and removes shared_ptr::unqiue. (#76576)

The status table incorrectly marks P0521R0 as nothing to do. This is not
correct the function should be deprecated.
During our latest m

[libc++] Deprecates and removes shared_ptr::unqiue. (#76576)

The status table incorrectly marks P0521R0 as nothing to do. This is not
correct the function should be deprecated.
During our latest monthly meeting we argreed to remove the
_LIBCPP_ENABLE_CXXyy_REMOVED_FEATURES macros, therefore the new macro is
not
added to that global list.

Implements
- P0521R0 Proposed Resolution for CA 14 (shared_ptr use_count/unique)

Implements parts of
- P0619R4 Reviewing Deprecated Facilities of C++17 for C++20

---------

Co-authored-by: Nikolas Klauser <nikolasklauser@berlin.de>

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[libc++][NFC] Add a few clang-format annotations (#74352)

This is in preparation for clang-formatting the whole code base. These
annotations are required either to avoid clang-format bugs or becaus

[libc++][NFC] Add a few clang-format annotations (#74352)

This is in preparation for clang-formatting the whole code base. These
annotations are required either to avoid clang-format bugs or because
the manually formatted code is significantly more readable than the
clang-formatted alternative. All in all, it seems like very few
annotations are required, which means that clang-format is doing a very
good job in most cases.

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[libc++] LWG 3821 uses_allocator_construction_args should have overload for pair-like (#66939)

This change addresses LWG 3821 and LWG 3677.

- make `std::pair`'s constructor no longer takes `subra

[libc++] LWG 3821 uses_allocator_construction_args should have overload for pair-like (#66939)

This change addresses LWG 3821 and LWG 3677.

- make `std::pair`'s constructor no longer takes `subrange`
- `uses_allocator_construction_args` constraint changes w.r.t to
`pair-like` types
- `uses_allocator_construction_args` constraints checks
`is-pair-like<remove_cv_t<T>>`

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[libc++][spaceship] P1614R2: Removed global `operator!=` from `allocator`

Implements parts of P1614R2:
- Removed global `operator!=` from `allocator`

Reviewed By: #libc, Mordante

Differential Revi

[libc++][spaceship] P1614R2: Removed global `operator!=` from `allocator`

Implements parts of P1614R2:
- Removed global `operator!=` from `allocator`

Reviewed By: #libc, Mordante

Differential Revision: https://reviews.llvm.org/D152612

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[libc++][PSTL] Remove current integration

We decided to go a different route. To make the switch easier, rip out the old integration first and build on a clean base.

Reviewed By: ldionne, #libc, #l

[libc++][PSTL] Remove current integration

We decided to go a different route. To make the switch easier, rip out the old integration first and build on a clean base.

Reviewed By: ldionne, #libc, #libc_abi

Spies: arichardson, libcxx-commits

Differential Revision: https://reviews.llvm.org/D148480

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[libc++] Remove <cstdlib> includes

We changed the `abort` calls when trying to throw exceptions in `-fno-exceptions` mode to `__verbose_abort` calls, which removes the dependency in most files.

Rev

[libc++] Remove <cstdlib> includes

We changed the `abort` calls when trying to throw exceptions in `-fno-exceptions` mode to `__verbose_abort` calls, which removes the dependency in most files.

Reviewed By: ldionne, #libc

Spies: dim, emaste, mikhail.ramalho, smeenai, libcxx-commits

Differential Revision: https://reviews.llvm.org/D146076

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[libc++] Granularize <atomic> includes

Reviewed By: ldionne, Mordante, #libc

Spies: arichardson, libcxx-commits

Differential Revision: https://reviews.llvm.org/D144255

[libc++] implement P1020R1 P1973R1 make_unique[shared]_for_overwrite

Differential Revision: https://reviews.llvm.org/D140913

[libc++] Granularize <concept> includes

Reviewed By: ldionne, #libc

Spies: libcxx-commits

Differential Revision: https://reviews.llvm.org/D137283

[libc++] Implement P0591R4 (Utility functions to implement uses-allocator construction)

Reviewed By: ldionne, #libc, huixie90

Spies: huixie90, libcxx-commits, mgorny

Differential Revision: https:/

[libc++] Implement P0591R4 (Utility functions to implement uses-allocator construction)

Reviewed By: ldionne, #libc, huixie90

Spies: huixie90, libcxx-commits, mgorny

Differential Revision: https://reviews.llvm.org/D131898

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Revert "[libc++] Implement P0591R4 (Utility functions to implement uses-allocator construction)"

Breaks ubsan tests https://lab.llvm.org/buildbot/#/builders/85/builds/11131

This reverts commit 0993

Revert "[libc++] Implement P0591R4 (Utility functions to implement uses-allocator construction)"

Breaks ubsan tests https://lab.llvm.org/buildbot/#/builders/85/builds/11131

This reverts commit 099384dcea49f5f4b0dc7e615c9845bf9baad4bc.

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[libc++] Implement P0591R4 (Utility functions to implement uses-allocator construction)

Reviewed By: ldionne, #libc, huixie90

Spies: huixie90, libcxx-commits, mgorny

Differential Revision: https:/

[libc++] Implement P0591R4 (Utility functions to implement uses-allocator construction)

Reviewed By: ldionne, #libc, huixie90

Spies: huixie90, libcxx-commits, mgorny

Differential Revision: https://reviews.llvm.org/D131898

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[libc++][NFC] Fix some standard-mandated includes comments

Reviewed By: ldionne, #libc

Spies: libcxx-commits

Differential Revision: https://reviews.llvm.org/D134447

[libc++] Granularize the rest of memory

Reviewed By: ldionne, #libc

Spies: vitalybuka, paulkirth, libcxx-commits, mgorny

Differential Revision: https://reviews.llvm.org/D132790