Export of internal Abseil changes.

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8becce38c862a044db194a9aea1b505796a46d6f by Abseil Team <absl-team@google.com>:

Updates the FixedArray's constructors to be exception safe by preventing double deletions. Also adds exception safety tests for FixedArray to document/enforce the expected behavior.

PiperOrigin-RevId: 201964431

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794188b401a602b4be97190fb8738066fe1f9ca5 by Derek Mauro <dmauro@google.com>:

Fixes for str_format.h documentation.

PiperOrigin-RevId: 201951760

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beae3bdd6eee2cf61101102fddc35ada188f330b by Alex Strelnikov <strel@google.com>:

Add numeric_limits specialization for uint128.

Turns out numeric_limits is a case where the consensus is that it is okay to specialize for a user defined type.

PiperOrigin-RevId: 201944736

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b2b3444a52b36878ade1ae8801e69932b05fc4f9 by Shaindel Schwartz <shaindel@google.com>:

Internal change.

PiperOrigin-RevId: 201718662

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aa924c459922f39caabfc193998c58d0f4981ac0 by Abseil Team <absl-team@google.com>:

Typo fix.

PiperOrigin-RevId: 201692176

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bbfcaa7b1af331d9b97c92470608240c5c864fbc by Xiaoyi Zhang <zhangxy@google.com>:

Use ABSL_HAVE_ANY/OPTIONAL/VARIANT to conditionally compile out the definition of absl::bad_any_cast, absl::bad_optional_access, absl::bad_variant_access. This would fix the issues where users #include those header directly in C++17 modes.

PiperOrigin-RevId: 201683792
GitOrigin-RevId: 8becce38c862a044db194a9aea1b505796a46d6f
Change-Id: I60a7ad043136a439d82c374d225a1804016b0509

1 files changed, 33 insertions, 0 deletions

diff --git a/absl/memory/memory.h b/absl/memory/memory.h
index cd818cff..c43e1566 100644
--- a/absl/memory/memory.h
+++ b/absl/memory/memory.h
@@ -636,6 +636,39 @@ struct default_allocator_is_nothrow : std::true_type {};
 struct default_allocator_is_nothrow : std::false_type {};
 #endif
 
+namespace memory_internal {
+// TODO(b110200014): Implement proper backports
+template <typename ForwardIt>
+void DefaultConstruct(ForwardIt it) {
+  using value_type = typename std::iterator_traits<ForwardIt>::value_type;
+  ::new (static_cast<void*>(std::addressof(*it))) value_type;
+}  // namespace memory_internal
+
+#ifdef ABSL_HAVE_EXCEPTIONS
+template <typename ForwardIt, typename Size>
+void uninitialized_default_construct_n(ForwardIt first, Size size) {
+  for (ForwardIt cur = first; size > 0; static_cast<void>(++cur), --size) {
+    try {
+      absl::memory_internal::DefaultConstruct(cur);
+    } catch (...) {
+      using value_type = typename std::iterator_traits<ForwardIt>::value_type;
+      for (; first != cur; ++first) {
+        first->~value_type();
+      }
+      throw;
+    }
+  }
+}
+#else   // ABSL_HAVE_EXCEPTIONS
+template <typename ForwardIt, typename Size>
+void uninitialized_default_construct_n(ForwardIt first, Size size) {
+  for (; size > 0; static_cast<void>(++first), --size) {
+    absl::memory_internal::DefaultConstruct(first);
+  }
+}
+#endif  // ABSL_HAVE_EXCEPTIONS
+}  // namespace memory_internal
+
 }  // namespace absl
 
 #endif  // ABSL_MEMORY_MEMORY_H_