[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++] Make sure ranges algorithms and views handle boolean-testable correctly (#69378)

Before this patch, we would fail to implicitly convert the result of
predicates to bool, which means we'd p

[libc++] Make sure ranges algorithms and views handle boolean-testable correctly (#69378)

Before this patch, we would fail to implicitly convert the result of
predicates to bool, which means we'd potentially perform a copy or move
construction of the boolean-testable, which isn't allowed. The same
holds true for comparing iterators against sentinels, which is allowed
to return a boolean-testable type.

We already had tests aiming to ensure correct handling of these types,
but they failed to provide appropriate coverage in several cases due to
guaranteed RVO. This patch fixes the tests, adds tests for missing
algorithms and views, and fixes the actual problems in the code.

Fixes #69074

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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++][NFC] Rename __lower_bound_impl to __lower_bound

For consistency with other algorithms.

Differential Revision: https://reviews.llvm.org/D153141

[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 [[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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[lib++][ranges][NFC] Refactor `iterator_operations.h` to use tags.

Change the mechanism in `iterator_operations.h` to pass around a generic
policy tag indicating whether an internal function is bein

[lib++][ranges][NFC] Refactor `iterator_operations.h` to use tags.

Change the mechanism in `iterator_operations.h` to pass around a generic
policy tag indicating whether an internal function is being invoked from
a "classic" STL algorithm or a ranges algorithm. `IterOps` is now
a template class specialized on the policy tag.

The advantage is that this mechanism is more generic and allows defining
arbitrary conditions in a clean manner.

Also add a few more iterator functions to `IterOps`.

Differential Revision: https://reviews.llvm.org/D129390

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[libc++] Fix std::lower_bound with C++20-hostile iterators

Reviewed By: EricWF, #libc

Spies: sstefan1, libcxx-commits, mgorny

Differential Revision: https://reviews.llvm.org/D127577

[libc++][ranges] Implement ranges::binary_search and ranges::{lower, upper}_bound

Reviewed By: Mordante, var-const, ldionne, #libc

Spies: sstefan1, libcxx-commits, mgorny

Differential Revision: ht

[libc++][ranges] Implement ranges::binary_search and ranges::{lower, upper}_bound

Reviewed By: Mordante, var-const, ldionne, #libc

Spies: sstefan1, libcxx-commits, mgorny

Differential Revision: https://reviews.llvm.org/D121964

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