Export of internal Abseil changes

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0b13723ab1ca5231950c3ef76e57c415ce36d9d2 by Abseil Team <absl-team@google.com>:

Fix documentation typo

PiperOrigin-RevId: 348003868

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2ad4875258ffd604b19f57d7cfbb9f9a093ff880 by Derek Mauro <dmauro@google.com>:

Add missing #include <assert.h>

Note: This file is sometimes used from C so we can't use <cassert>
PiperOrigin-RevId: 347931562

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4d0c777a3645bddea9d0d6c49ec8ef3afea8c0b7 by Chris Kennelly <ckennelly@google.com>:

Use unsigned types for BitMask helper functions.

Additionally, explicitly perform narrowing cast.  T will always have fewer than
2^32 bits.

PiperOrigin-RevId: 347913413

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80c44b0b066485a25baff56d475b67be2ad027e7 by Abseil Team <absl-team@google.com>:

Stash errno for a larger scope.

Also adjust the test to account for EXPECT_* possibly modifying errno as well.

PiperOrigin-RevId: 347899763
GitOrigin-RevId: 0b13723ab1ca5231950c3ef76e57c415ce36d9d2
Change-Id: I9e7c0e5d45ac778644f3ad72d215378a8cf8a7d4

1 files changed, 7 insertions, 5 deletions

diff --git a/absl/container/internal/raw_hash_set.h b/absl/container/internal/raw_hash_set.h
index 4477f7dc..74b2ef4c 100644
--- a/absl/container/internal/raw_hash_set.h
+++ b/absl/container/internal/raw_hash_set.h
@@ -189,7 +189,7 @@ constexpr bool IsNoThrowSwappable(std::false_type /* is_swappable */) {
 }
 
 template <typename T>
-int TrailingZeros(T x) {
+uint32_t TrailingZeros(T x) {
   ABSL_INTERNAL_ASSUME(x != 0);
   return countr_zero(x);
 }
@@ -221,19 +221,21 @@ class BitMask {
   }
   explicit operator bool() const { return mask_ != 0; }
   int operator*() const { return LowestBitSet(); }
-  int LowestBitSet() const {
+  uint32_t LowestBitSet() const {
     return container_internal::TrailingZeros(mask_) >> Shift;
   }
-  int HighestBitSet() const { return (bit_width(mask_) - 1) >> Shift; }
+  uint32_t HighestBitSet() const {
+    return static_cast<uint32_t>((bit_width(mask_) - 1) >> Shift);
+  }
 
   BitMask begin() const { return *this; }
   BitMask end() const { return BitMask(0); }
 
-  int TrailingZeros() const {
+  uint32_t TrailingZeros() const {
     return container_internal::TrailingZeros(mask_) >> Shift;
   }
 
-  int LeadingZeros() const {
+  uint32_t LeadingZeros() const {
     constexpr int total_significant_bits = SignificantBits << Shift;
     constexpr int extra_bits = sizeof(T) * 8 - total_significant_bits;
     return countl_zero(mask_ << extra_bits) >> Shift;