[libc++] Remove dedicated namespaces for ranges functions (#76543)

We originally put implementation-detail function objects into individual
namespaces for `std::ranges` without a good reason for do

[libc++] Remove dedicated namespaces for ranges functions (#76543)

We originally put implementation-detail function objects into individual
namespaces for `std::ranges` without a good reason for doing so. This
practice was continued, presumably because there was prior art. Since
there's no reason to keep these namespaces, this commit removes them,
which will slightly impact binary size.

This commit does not apply to CPOs, some of which need additional work.

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[libc++] Remove _LIBCPP_DISABLE_NODISCARD_EXTENSIONS and refactor the tests (#87094)

This also adds a few tests that were missing.

[libc++][NFC] Fix leftover && in comment

[libc++][hardening] Categorize more 'valid-element-access' checks. (#71620)

[libc++][hardening][NFC] Introduce `_LIBCPP_ASSERT_UNCATEGORIZED`.

Replace most uses of `_LIBCPP_ASSERT` with
`_LIBCPP_ASSERT_UNCATEGORIZED`.

This is done as a prerequisite to introducing hardened

[libc++][hardening][NFC] Introduce `_LIBCPP_ASSERT_UNCATEGORIZED`.

Replace most uses of `_LIBCPP_ASSERT` with
`_LIBCPP_ASSERT_UNCATEGORIZED`.

This is done as a prerequisite to introducing hardened mode to libc++.
The idea is to make enabling assertions an opt-in with (somewhat)
fine-grained controls over which categories of assertions are enabled.
The vast majority of assertions are currently uncategorized; the new
macro will allow turning on `_LIBCPP_ASSERT` (the underlying mechanism
for all kinds of assertions) without enabling all the uncategorized
assertions (in the future; this patch preserves the current behavior).

Differential Revision: https://reviews.llvm.org/D153816

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[libc++][NFC] Apply clang-format on large parts of the code base

This commit does a pass of clang-format over files in libc++ that
don't require major changes to conform to our style guide, or for
w

[libc++][NFC] Apply clang-format on large parts of the code base

This commit does a pass of clang-format over files in libc++ that
don't require major changes to conform to our style guide, or for
which we're not overly concerned about conflicting with in-flight
patches or hindering the git blame.

This roughly covers:
- benchmarks
- range algorithms
- concepts
- type traits

I did a manual verification of all the changes, and in particular I
applied clang-format on/off annotations in a few places where the
result was less readable after than before. This was not necessary
in a lot of places, however I did find that clang-format had pretty
bad taste when it comes to formatting concepts.

Differential Revision: https://reviews.llvm.org/D153140

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[libc++] Optimize std::ranges::{min, max} for types that are cheap to copy

Don't forward to `min_element` for small types that are trivially copyable, and instead use a naive loop that keeps track o

[libc++] Optimize std::ranges::{min, max} for types that are cheap to copy

Don't forward to `min_element` for small types that are trivially copyable, and instead use a naive loop that keeps track of the smallest element (as opposed to an iterator to the smallest element). This allows the compiler to vectorize the loop in some cases.

Reviewed By: #libc, ldionne

Spies: ldionne, libcxx-commits

Differential Revision: https://reviews.llvm.org/D143596

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[libc++][NFC] Replace _LIBCPP_STD_VER > x with _LIBCPP_STD_VER >= x

This change is almost fully mechanical. The only interesting change is in `generate_feature_test_macro_components.py` to generate

[libc++][NFC] Replace _LIBCPP_STD_VER > x with _LIBCPP_STD_VER >= x

This change is almost fully mechanical. The only interesting change is in `generate_feature_test_macro_components.py` to generate `_LIBCPP_STD_VER >=` instead. To avoid churn in the git-blame this commit should be added to the `.git-blame-ignore-revs` once committed.

Reviewed By: ldionne, var-const, #libc

Spies: jloser, libcxx-commits, arichardson, arphaman, wenlei

Differential Revision: https://reviews.llvm.org/D143962

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[libc++] Add [[clang::lifetimebound]] to min/max algorithms

Reviewed By: Mordante, #libc

Spies: libcxx-commits

Differential Revision: https://reviews.llvm.org/D142608

[libc++] Add [[nodiscard]] extensions to ranges algorithms

This mirrors what we have done in the classic algorithms

Reviewed By: ldionne, #libc

Spies: libcxx-commits

Differential Revision: https:

[libc++] Add [[nodiscard]] extensions to ranges algorithms

This mirrors what we have done in the classic algorithms

Reviewed By: ldionne, #libc

Spies: libcxx-commits

Differential Revision: https://reviews.llvm.org/D137186

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[libc++] Make <ranges> non-experimental

When we ship LLVM 16, <ranges> won't be considered experimental anymore.
We might as well do this sooner rather than later.

Differential Revision: https://re

[libc++] Make <ranges> non-experimental

When we ship LLVM 16, <ranges> won't be considered experimental anymore.
We might as well do this sooner rather than later.

Differential Revision: https://reviews.llvm.org/D132151

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[libc++][ranges] Implement ranges::min

Reviewed By: var-const, Mordante, #libc

Spies: jwakely, ldionne, libcxx-commits, mgorny

Differential Revision: https://reviews.llvm.org/D119589