Export of internal Abseil changes

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228b5878d7a994656f383666cfaee34e33e0b09b by Abseil Team <absl-team@google.com>:

Add element_type typedef to match std::span<T>

PiperOrigin-RevId: 390186160

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c91d96c88c60be793c525158f76dfcaa5e32d161 by Abseil Team <absl-team@google.com>:

Rollback change to only hide retired flags if human-readable output
is requested

PiperOrigin-RevId: 390183146

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170192c10ef8d513de80f29298ce93eeccc3712c by Abseil Team <absl-team@google.com>:

Move alignas(16) before ABSL_CONST_INIT and ABSL_DLL.

PiperOrigin-RevId: 390182845

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77a5ee5081c81cef625fac7bbcf993cc028b32ed by Evan Brown <ezb@google.com>:

Use simple SlotOffset and AllocSize logic instead of container_internal::Layout in order to save linker input size for non-opt and sanitizer builds.

In opt mode, all of this logic is inlined so we don't save linker input size in opt mode.

PiperOrigin-RevId: 389914594
GitOrigin-RevId: 228b5878d7a994656f383666cfaee34e33e0b09b
Change-Id: I3b904068687574931d8390071b322c0c3c083283

2 files changed, 3 insertions, 1 deletions

diff --git a/absl/types/span.h b/absl/types/span.h
index 41db3420..6272bb7a 100644
--- a/absl/types/span.h
+++ b/absl/types/span.h
@@ -40,7 +40,6 @@
 //    * `absl::Span` has compiler-provided move and copy constructors and
 //      assignment. This is due to them being specified as `constexpr`, but that
 //      implies const in C++11.
-//    * `absl::Span` has no `element_type` typedef
 //    * A read-only `absl::Span<const T>` can be implicitly constructed from an
 //      initializer list.
 //    * `absl::Span` has no `bytes()`, `size_bytes()`, `as_bytes()`, or
@@ -170,6 +169,7 @@ class Span {
       typename std::enable_if<!std::is_const<T>::value, U>::type;
 
  public:
+  using element_type = T;
   using value_type = absl::remove_cv_t<T>;
   using pointer = T*;
   using const_pointer = const T*;
diff --git a/absl/types/span_test.cc b/absl/types/span_test.cc
index 2584339b..13264aae 100644
--- a/absl/types/span_test.cc
+++ b/absl/types/span_test.cc
@@ -661,6 +661,8 @@ TEST(IntSpan, ExposesContainerTypesAndConsts) {
   CheckType<absl::Span<int>::const_reverse_iterator>(slice.crend());
   testing::StaticAssertTypeEq<int, absl::Span<int>::value_type>();
   testing::StaticAssertTypeEq<int, absl::Span<const int>::value_type>();
+  testing::StaticAssertTypeEq<int, absl::Span<int>::element_type>();
+  testing::StaticAssertTypeEq<const int, absl::Span<const int>::element_type>();
   testing::StaticAssertTypeEq<int*, absl::Span<int>::pointer>();
   testing::StaticAssertTypeEq<const int*, absl::Span<const int>::pointer>();
   testing::StaticAssertTypeEq<int&, absl::Span<int>::reference>();