[libc++] Qualifies size_t.

This has been done using the following command

find libcxx/test -type f -exec perl -pi -e 's|^([^/]+?)((?<!::)size_t)|\1std::\2|' \{} \;

And manually removed some fals

[libc++] Qualifies size_t.

This has been done using the following command

find libcxx/test -type f -exec perl -pi -e 's|^([^/]+?)((?<!::)size_t)|\1std::\2|' \{} \;

And manually removed some false positives in std/depr/depr.c.headers.

The `std` module doesn't export `::size_t`, this is a preparation for that module.

Reviewed By: ldionne, #libc, EricWF, philnik

Differential Revision: https://reviews.llvm.org/D146088

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[libc++] Remove default definition of std::char_traits

This patch removes the base template implementation for std::char_traits.
If my reading of http://eel.is/c++draft/char.traits is correct, the
S

[libc++] Remove default definition of std::char_traits

This patch removes the base template implementation for std::char_traits.
If my reading of http://eel.is/c++draft/char.traits is correct, the
Standard mandates that the library provides specializations for several
types like char and wchar_t, but not any implementation in the base
template. Indeed, such an implementation is bound to be incorrect for
most types anyways, since things like `eof()` and `int_type` will definitely
have to be customized.

Since the base template implementation should not have worked for anyone,
this shouldn't be a breaking change (I expect that anyone defining a
custom character type today will already have to provide their own
specialization of char_traits). However, since we're aware of some users
of char_traits for unsigned char and signed char, we're keeping those two
specializations around for two releases to give people some time to migrate.

Differential Revision: https://reviews.llvm.org/D138307

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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++][test] Refactor SmallBasicString uses in range.lazy.split tests

The tests for `std::ranges::lazy_split_view` heavily use a wrapper class around
`std::string` because `std::string` was not `c

[libc++][test] Refactor SmallBasicString uses in range.lazy.split tests

The tests for `std::ranges::lazy_split_view` heavily use a wrapper class around
`std::string` because `std::string` was not `constexpr` until recently. Where
possible, remove the wrapper class and extra functionality no longer needed.
Remove `libcxx/test/std/ranges/range.adaptors/range.lazy.split/small_string.h`
and inline its one use remaining in
`libcxx/test/std/ranges/range.adaptors/range.lazy.split/general.pass.cpp`.

Differential Revision: https://reviews.llvm.org/D126663

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[libc++][ranges] Implement `lazy_split_view`.

Note that this class was called just `split_view` in the original One
Ranges Proposal and was renamed to `lazy_split_view` by
[P2210](https://wg21.link/

[libc++][ranges] Implement `lazy_split_view`.

Note that this class was called just `split_view` in the original One
Ranges Proposal and was renamed to `lazy_split_view` by
[P2210](https://wg21.link/p2210).

Co-authored-by: zoecarver <z.zoelec2@gmail.com>

Differential Revision: https://reviews.llvm.org/D107500

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