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Export of internal Abseil changes.

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--
6fdf24a197b964f9bacbebd0ceca305aef1654fc by Shaindel Schwartz <shaindel@google.com>:

Internal change

PiperOrigin-RevId: 231627312

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65f7faf52bff01384171efb85fee159378dedf70 by CJ Johnson <johnsoncj@google.com>:

Relocates the definitions of the InputIterator-accepting parts of the InlinedVector API into the top-level. The removed functions had no other callers so there was no reason to keep the layer of indirection in the form of the function call.

PiperOrigin-RevId: 231527459

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30e105b749b5ecc50fdaf26c7da589617efce425 by CJ Johnson <johnsoncj@google.com>:

Relocates closing brace for absl namespace in InlinedVector to the correct end location

PiperOrigin-RevId: 231477871

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063c1e8b9d1f032662c46d574e20ecc357b87d0c by Eric Fiselier <ericwf@google.com>:

Cleanup std::hash probing metafunctions.

Previously there were two different ways to probe for
std::hash. One in hash.h and another in type_traits.h,
and they were both implemented differently, and neither
correctly worked around bad STL implementations.

This patch unifies the implementations into a single IsHashable trait.
It also:

* Correctly checks for old libc++ versions where this won't work.
* Avoids undefined behavior which resulted from calling std::is_constructible
  incomplete types.
* Unifies the feature test macro used in the headers and the tests.

Additionally it also slightly changes the behavior of when absl::variant
is hashable. Previously we disable hashing when std::hash<T>()(key) was
formed but when std::hash<T> couldn't be destructed. This seems wrong. If a
user provides a evil specialization of std::hash, then it's OK for variant's
hash to blow up.

PiperOrigin-RevId: 231468345

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05d75dd4b07c893de9b104731644d0d207b01253 by Abseil Team <absl-team@google.com>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 231397518

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a0ee9032f9e04039f3410ed17fcf45ae1a3868f5 by CJ Johnson <johnsoncj@google.com>:

Remove unused EnableIfAtLeastInputIterator from InlinedVector

PiperOrigin-RevId: 231348903

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4dcd4e9a6780a81d7a6974c7bf22a037e6482b49 by Abseil Team <absl-team@google.com>:

Remove unnecessary register keyword from absl/base/internal/endian.h.

PiperOrigin-RevId: 231316570

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c8584836caa3a10f90a8604a85d4b831310b72ee by Abseil Team <absl-team@google.com>:

Fix hashtablez_sampler compilation on older Android NDK builds

PiperOrigin-RevId: 231283542
GitOrigin-RevId: 6fdf24a197b964f9bacbebd0ceca305aef1654fc
Change-Id: I185b12fb8347e3ad0ffcb2cbb83a53450e5eb938
This commit is contained in:
Abseil Team 2019-01-30 10:59:43 -08:00 • committed by Ashley Hedberg
parent 540e2537b9
commit a4cb1c8ba6
13 changed files with 436 additions and 119 deletions
Download patch file Download diff file Expand all files Collapse all files

19
absl/hash/internal/hash.h
View file

@ -541,17 +541,8 @@ hash_range_or_bytes(H hash_state, const T* data, size_t size) {
// * If is_uniquely_represented, hash bytes directly.
// * ADL AbslHashValue(H, const T&) call.
// * std::hash<T>
// In MSVC we can't probe std::hash or stdext::hash because it triggers a
// static_assert instead of failing substitution.
#if defined(_MSC_VER)
#define ABSL_HASH_INTERNAL_CAN_POISON_ 0
#else // _MSC_VER
#define ABSL_HASH_INTERNAL_CAN_POISON_ 1
#endif // _MSC_VER
#if defined(ABSL_INTERNAL_LEGACY_HASH_NAMESPACE) && \
ABSL_HASH_INTERNAL_CAN_POISON_
ABSL_META_INTERNAL_STD_HASH_SFINAE_FRIENDLY_
#define ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_ 1
#else
#define ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_ 0
@ -616,13 +607,7 @@ struct HashSelect {
#endif // ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_
template <typename U>
using ProbeStdHash =
#if ABSL_HASH_INTERNAL_CAN_POISON_
std::is_convertible<decltype(std::hash<U>()(std::declval<const U&>())),
size_t>;
#else // ABSL_HASH_INTERNAL_CAN_POISON_
std::true_type;
#endif // ABSL_HASH_INTERNAL_CAN_POISON_
using ProbeStdHash = absl::type_traits_internal::IsHashable<U>;
template <typename U>
using ProbeNone = std::true_type;

2
absl/hash/internal/spy_hash_state.h
View file

@ -200,7 +200,7 @@ bool RunOnStartup<f>::run = (f(), true);
template <
typename T, typename U,
// Only trigger for when (T != U),
absl::enable_if_t<!std::is_same<T, U>::value, int> = 0,
typename = absl::enable_if_t<!std::is_same<T, U>::value>,
// This statement works in two ways:
// - First, it instantiates RunOnStartup and forces the initialization of
// `run`, which set the global variable.