PiperOrigin-RevId: 488373221
Change-Id: I1e30820188cc860ce4df8fddafa04de343ec46af

matching ${TZDIR} setting for, //absl/time/internal/cctz:zoneinfo.

This eliminates any hidden dependency on /usr/share/zoneinfo, and
enables the upcoming deletion of the embedded internal/zoneinfo.inc
data from //absl/time:test_util.

PiperOrigin-RevId: 488372848
Change-Id: If1c8525b5ca4348cb2fc3b4760819f791b6e9725

Previously, ~raw_hash_set() would change *this to have the same
representation as an empty hash table. This is unnecessary since
nobody should be touching a destroyed hash table, and prevents future
optimizations/changes that might not be able to preserve this
behavior.

PiperOrigin-RevId: 487899950
Change-Id: I2d4470677bdd411c2e48ef511187e39f4e7fc2f4

PiperOrigin-RevId: 487707178
Change-Id: Ie8f57a6327a6460ab37566b8b6f56d470f6dd2dc

This fixes the build on arm64 macOS.

Note that hardware acceleration is not yet enabled on arm64 when not
running under Linux.

Addresses the report from https://github.com/abseil/abseil-cpp/commit/1687dbf814eceb93de2d93f91b31acaab404091c#commitcomment-89529264

PiperOrigin-RevId: 487655295
Change-Id: I168dfc863c960d0b694b26dfcb85ff0fd0e95a1e

- Add assertions that the iterators are either (a) from the same container or (b) both default constructed. Standard says: "The domain of == for forward iterators is that of iterators over the same underlying sequence. However, value-initialized iterators may be compared and shall compare equal to other value-initialized iterators of the same type." - [reference](https://eel.is/c++draft/forward.iterators#2).
- Also optimize IsEndIterator a bit.

PiperOrigin-RevId: 487617518
Change-Id: Iefba5c3bc8caa93954671793e6929e22f419c298

PiperOrigin-RevId: 487592054
Change-Id: Iff24f6e2a304fbc85843f10417fc3343c41333da

deprecation of ATOMIC_FLAG_INIT.

Another option would have been to use macros to only initialize
std::atomic_flag before C++20, but I decided to use one compilation
path instead.

The major difference between std::atomic_flag and std::atomic<bool> is
that the former is guaranteed to be lock-free, but we already assume
std::atomic<bool> is lock-free in many places.

https://en.cppreference.com/w/cpp/atomic/atomic_flag

PiperOrigin-RevId: 487397075
Change-Id: I3f1c539ec8b2ca58547282e69ed73e93243e8efe

PiperOrigin-RevId: 487394692
Change-Id: I55e9b57055483dc921e9773c3643ea9be4f9bdf6

This implementation can advantage of hardware acceleration available
on common CPUs when using GCC and Clang. A future update may enable
this on MSVC as well.

PiperOrigin-RevId: 487327024
Change-Id: I99a8f1bcbdf25297e776537e23bd0a902e0818a1

We check for comparisons of swisstable iterators from different heap allocations, which can indicate either iterators from different containers or that there was a rehash between when the iterators were initialized.

PiperOrigin-RevId: 487304602
Change-Id: I5c596c5ea07948d66e048f99937f9032a630344f

PiperOrigin-RevId: 487292771
Change-Id: I2454e28fe91017fb2954a4ad194712fcafe893d2

PiperOrigin-RevId: 486867412
Change-Id: Ib54b1acaf1ea57f8f377c87261d7d52e9a48784f

Factor out the internal helper AppendTruncated, which is used and redefined in a couple places, plus several more that have yet to be released.

PiperOrigin-RevId: 486759835
Change-Id: Ib1b24f287f856ca38b691fbce7e747f0f5a34626

Note that multi{set,map}::emplace doesn't specify in which order the new element is inserted if there are equivalent keys in the table, whereas emplace_hint specifies that the new element must be before the hint if possible.
https://en.cppreference.com/w/cpp/container/multiset/emplace
https://en.cppreference.com/w/cpp/container/multiset/emplace_hint

Also refactor to rely on IsAssertEnabled instead of checking for NDEBUG.

PiperOrigin-RevId: 486733450
Change-Id: Ie90d33c584a6caccd8301ad6fc0396234dbbfac4

In order for Condition to work on Microsoft platforms, it has to store pointers to methods that are larger than we usually expect. MSVC pointers to methods from class hierarchies that employ multiple inheritance or virtual inheritance are strictly larger than pointers to methods in class hierarchies that only employ single inheritance.

This change introduces an opaque declaration of a class, which is not fulfilled. This declaration is used to calculate the size of the Condition method pointer allocation. Because the declaration is of unspecified inheritance, the compiler is forced to use a conservatively large allocation, which will thereby accommodate all method pointer sizes.

Because the `method_` and `function_` callbacks are only populated in mutually exclusive conditions, they can be allowed to take up the same space in the Condition object. This change combines the `method_` and `function_` fields and renames the new field to `callback_`. The constructor logic is updated to reflect the new field.

PiperOrigin-RevId: 486701312
Change-Id: If06832cc26f27d91e295183e44dc29440af5f9db

PiperOrigin-RevId: 486480813
Change-Id: I05292dd0550dfb4130bbe47eafa96ff5b58c040b

PiperOrigin-RevId: 486227733
Change-Id: If492d715e5758971cf7bd0ccd748b47b1424a3c7

PiperOrigin-RevId: 486023797
Change-Id: I0b82754fd40c2d6fb451f304aaf1d795eed8d009

PiperOrigin-RevId: 485921596
Change-Id: I453801e3d7b4a60ecedf173d448c8b6f51cb0b2e

PiperOrigin-RevId: 485886212
Change-Id: Ic7a710913f8376d07b9bdeb987d007ec04e48465

PiperOrigin-RevId: 485885633
Change-Id: Idfaf6ce22a9421fe05ae38029c8a68b720ce50ba

PiperOrigin-RevId: 485868656
Change-Id: I09d70adc570b6b79a80c29f89601186aab390032

If a user-defined type has `AbslStringify()` defined, it will always be used for logging over `operator<<`.

`HasAbslStringify` now uses the empty class `UnimplementedSink` for its checks instead of `StringifySink` in order to make it work in cases involving other sinks.

PiperOrigin-RevId: 485710377
Change-Id: Ibdd916151c7abc3269c35fbe79b772867f3d25e1

Eliminate span_internal::Min in favor of std::min, since Min conflicts with a macro in a third-party library.

PiperOrigin-RevId: 485653193
Change-Id: I0615ceb9ea3e1533a989470e7c9863c86b70698b

PiperOrigin-RevId: 485575914
Change-Id: If1752252e3cc2f91dc3c171382c9fb3a4def0377

- Separate the failure cases into different assertions: end/default constructed vs rehashed or erased.
- Update the assertion error for AssertIsValid to not mention the end iterator case because end iterators are considered valid by AssertIsValid.
- Also fix an out-of-date comment for skip_empty_or_deleted.

PiperOrigin-RevId: 485402559
Change-Id: I593056abdc6c3565d0396fb885923fef643bf4e4

empty cord twice in a row.

PiperOrigin-RevId: 485367641
Change-Id: I6605ff25acbcef7c40b68e15a8888076a2da63be

Add a warning about extract invalidating iterators (not just the iterator of the element being extracted).

PiperOrigin-RevId: 485120182
Change-Id: Ic54d538721678bed0a748dacbf33c319e62b93b8

In a previous change, I forgot to fix the DLLs to
also set the target_compile_features() as needed.

Some amount of refactoring to expose the necessary
variables and functions in AbseilDll.cmake

Fixes #1116

PiperOrigin-RevId: 485101834
Change-Id: I5cd0eff9e20c0ddf48c364f917e40d66df0aac17

PiperOrigin-RevId: 485070787
Change-Id: Ie62021eaf84f5a43e8943d3167e98e3986fcf5a6

PiperOrigin-RevId: 485054062
Change-Id: Ieafa217b562548f8bb8dc6fc4e1e414f8ede0579

PiperOrigin-RevId: 484578104
Change-Id: Ie4be3e4de27dc28d88395e16fd075fb10ab7a302

file.

PiperOrigin-RevId: 484419458
Change-Id: Ic2c1afa1a3434ac071c01ae2e6c75dee41b1f069

This function is unnecessary as it was originally used to support modifiers with `absl::StrFormat()`. This functionality is irrelevant to `absl::StrCat()`.

PiperOrigin-RevId: 484339246
Change-Id: I8c4a0ee01b30aee7a83f6ab54e5465465cc9cc56

PiperOrigin-RevId: 484181180
Change-Id: I00206c1506a25dca5555261d6500c1e54368a368

ABSL_RANDOM_RANDEN_COPTS

Everything works fine when this is empty

Fixes #1301

PiperOrigin-RevId: 484014466
Change-Id: I2fa96d845320f23063e1e86ee2df3ac14bd44012

PiperOrigin-RevId: 483972593
Change-Id: I5358871cdf825bbfae65bf9f5872c4fd56005fb7

PiperOrigin-RevId: 483752526
Change-Id: Ie6b63a4a3cc7593e5b8bf255ba571a77d609ce04