Export of internal Abseil changes

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0e867881e4b9f388a13d6fa8ed715192460130ab by Abseil Team <absl-team@google.com>:

Minor wording change to header comment for Mutex::AwaitWithDeadline(). No functional changes.

PiperOrigin-RevId: 306729491

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fc64361fb831003fa5e6fbb84a9a89338fd2838c by Derek Mauro <dmauro@google.com>:

Uses C++20 compatible allocator traits in Abseil types

This merges both instances of CountingAllocator in the Abseil codebase.
Makes the presubmits test C++20 mode.

Fixes #651

PiperOrigin-RevId: 306728102

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d759e5681b9dd6b7339fc019ed58fb5fdececdc3 by Derek Mauro <dmauro@google.com>:

Makes btree's iterator comparisons C++20 compatible

See https://stackoverflow.com/questions/60386792/c20-comparison-warning-about-ambiguous-reversed-operator

PiperOrigin-RevId: 306702048

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e9da5f409bc5ddb1bad308f9d8c41213c67a1d1e by Derek Mauro <dmauro@google.com>:

Switch a few uses of at() that should have been data() in the implementation of InlinedVector.
Use ABSL_HARDENING_ASSERT in resize().

PiperOrigin-RevId: 306670992
GitOrigin-RevId: 0e867881e4b9f388a13d6fa8ed715192460130ab
Change-Id: If431f3e5d77097e9901654773552dcc01dface87

1 files changed, 6 insertions, 0 deletions

diff --git a/absl/container/internal/btree.h b/absl/container/internal/btree.h
index 4504e9ce6659..b23138f09553 100644
--- a/absl/container/internal/btree.h
+++ b/absl/container/internal/btree.h
@@ -929,9 +929,15 @@ struct btree_iterator {
   void decrement_slow();
 
  public:
+  bool operator==(const iterator &other) const {
+    return node == other.node && position == other.position;
+  }
   bool operator==(const const_iterator &other) const {
     return node == other.node && position == other.position;
   }
+  bool operator!=(const iterator &other) const {
+    return node != other.node || position != other.position;
+  }
   bool operator!=(const const_iterator &other) const {
     return node != other.node || position != other.position;
   }