Export of internal Abseil changes.

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9fa04b5fb4b6aeb47226b9095b3bc36a53669c39 by Abseil Team <absl-team@google.com>:

Release types/compare.h, which contains stand ins for three-way comparison result types from C++20. Use absl::weak_ordering for a three-way comparator in test-instance-tracker.h.

PiperOrigin-RevId: 247290078

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70a762f4eb35ea1d5a5fcb3274a8086824a0b82c by Derek Mauro <dmauro@google.com>:

Upgrade linux_clang-latest builds to LLVM r356814 and Bazel 0.25.0

PiperOrigin-RevId: 247250176

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f305cd5c36561e4dbb69eb87568553ae5badcb15 by CJ Johnson <johnsoncj@google.com>:

Remove argument deduction based on template template argument in InlinedVector/Storage

PiperOrigin-RevId: 247232334

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2cab8e426838baceb7d08edb313416480d26aa5b by Eric Fiselier <ericwf@google.com>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 247140132
GitOrigin-RevId: 9fa04b5fb4b6aeb47226b9095b3bc36a53669c39
Change-Id: I373a7d9bc90befa2a9f06555cb8703610c0313b9

absl/container/BUILD.bazel

@@ -213,6 +213,7 @@ cc_library(
     visibility = [
         "//absl:__subpackages__",
     ],
+    deps = ["//absl/types:compare"],
 )
 
 cc_test(

absl/container/CMakeLists.txt

@@ -204,6 +204,8 @@ absl_cc_library(
     "internal/test_instance_tracker.cc"
   COPTS
     ${ABSL_DEFAULT_COPTS}
+  DEPS
+    absl::compare
   TESTONLY
 )
 

absl/container/inlined_vector.h

@@ -69,7 +69,7 @@ class InlinedVector {
   static_assert(
       N > 0, "InlinedVector cannot be instantiated with `0` inlined elements.");
 
-  using Storage = inlined_vector_internal::Storage<InlinedVector>;
+  using Storage = inlined_vector_internal::Storage<T, N, A>;
   using AllocatorTraits = typename Storage::AllocatorTraits;
 
   template <typename Iterator>

absl/container/internal/inlined_vector.h

@@ -31,12 +31,8 @@ using IsAtLeastForwardIterator = std::is_convertible<
     typename std::iterator_traits<Iterator>::iterator_category,
     std::forward_iterator_tag>;
 
-template <typename InlinedVector>
-class Storage;
-
-template <template <typename, size_t, typename> class InlinedVector, typename T,
-          size_t N, typename A>
-class Storage<InlinedVector<T, N, A>> {
+template <typename T, size_t N, typename A>
+class Storage {
  public:
   using allocator_type = A;
   using value_type = typename allocator_type::value_type;

absl/container/internal/test_instance_tracker.h

@@ -18,6 +18,8 @@
 #include <cstdlib>
 #include <ostream>
 
+#include "absl/types/compare.h"
+
 namespace absl {
 namespace test_internal {
 
@@ -96,6 +98,14 @@ class BaseCountedInstance {
     return value_ >= x.value_;
   }
 
+  absl::weak_ordering compare(const BaseCountedInstance& x) const {
+    ++num_comparisons_;
+    return value_ < x.value_
+               ? absl::weak_ordering::less
+               : value_ == x.value_ ? absl::weak_ordering::equivalent
+                                    : absl::weak_ordering::greater;
+  }
+
   int value() const {
     if (!is_live_) std::abort();
     return value_;

absl/container/internal/test_instance_tracker_test.cc

@@ -174,6 +174,8 @@ TEST(TestInstanceTracker, Comparisons) {
   EXPECT_EQ(5, tracker.comparisons());
   EXPECT_FALSE(one >= two);
   EXPECT_EQ(6, tracker.comparisons());
+  EXPECT_TRUE(one.compare(two) < 0);  // NOLINT
+  EXPECT_EQ(7, tracker.comparisons());
 
   tracker.ResetCopiesMovesSwaps();
   EXPECT_EQ(0, tracker.comparisons());