Export of internal Abseil changes

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ff793052bd01e1e4fcf639f94d7c30c4855a9372 by Evan Brown <ezb@google.com>:

Roll forward of btree_iterator refactoring.

PiperOrigin-RevId: 346116047

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17984679f16e3e2139b0f14fa76f4a6ca16a3ef9 by Chris Kennelly <ckennelly@google.com>:

Extend absl::StrContains to accept single character needles.

Single characters are more efficient to search for.  Extending this API allows
the abseil-string-find-str-contains Clang Tidy to include this pattern.

The C++ committee has adopted http://wg21.link/P1679 for inclusion in C++23.

PiperOrigin-RevId: 346095060

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ef20b31c501b1dcaa25e244fd8f8aa43dec09bd6 by Jorg Brown <jorg@google.com>:

Internal change for cord ring

PiperOrigin-RevId: 346087545

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b70f2c1cb77fc9e733a126e790967d45c5fd1dc7 by Derek Mauro <dmauro@google.com>:

Release layout_benchmark

PiperOrigin-RevId: 345968909

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3a0eda337ee43622f92cfe14c2aa06f72dc71ee5 by Derek Mauro <dmauro@google.com>:

Release raw_hash_set_probe_benchmark

PiperOrigin-RevId: 345965969

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abffdb4bb241a2264cb4e73a6262b660bb10447d by Derek Mauro <dmauro@google.com>:

Internal change

PiperOrigin-RevId: 345733599

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7c9e24a71188df945be17fe98f700bdb51f81b16 by Derek Mauro <dmauro@google.com>:

Release hash_benchmark

PiperOrigin-RevId: 345721635

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d68f33f17f9a8cd3f6da8eee3870bdb46402cdc8 by Derek Mauro <dmauro@google.com>:

Release raw_hash_set_benchmark

PiperOrigin-RevId: 345708384

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6e6c547d4d1327b226c0ffe8ff34d0aa103ce24b by Abseil Team <absl-team@google.com>:

Updates the implementation of InlinedVector to accurately express the value-initialization semantics of the default constructor

PiperOrigin-RevId: 345548260

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1532424deda97d468444c217cc0fa4614099c7c1 by Evan Brown <ezb@google.com>:

Rollback btree_iterator refactoring.

PiperOrigin-RevId: 345543900
GitOrigin-RevId: ff793052bd01e1e4fcf639f94d7c30c4855a9372
Change-Id: I719831981fd056de41939f9addfee3d85e3b49b2

2 files changed, 9 insertions, 7 deletions

diff --git a/absl/strings/internal/cord_internal.h b/absl/strings/internal/cord_internal.h
index ec2c767b..6fb75c4f 100644
--- a/absl/strings/internal/cord_internal.h
+++ b/absl/strings/internal/cord_internal.h
@@ -149,6 +149,8 @@ struct CordRep {
   inline const CordRepSubstring* substring() const;
   inline CordRepExternal* external();
   inline const CordRepExternal* external() const;
+  inline CordRepFlat* flat();
+  inline const CordRepFlat* flat() const;
 };
 
 struct CordRepConcat : public CordRep {
diff --git a/absl/strings/internal/cord_rep_flat.h b/absl/strings/internal/cord_rep_flat.h
index 3e2cd33c..80391a5e 100644
--- a/absl/strings/internal/cord_rep_flat.h
+++ b/absl/strings/internal/cord_rep_flat.h
@@ -43,7 +43,7 @@ static constexpr size_t kMaxFlatSize = 4096;
 static constexpr size_t kMaxFlatLength = kMaxFlatSize - kFlatOverhead;
 static constexpr size_t kMinFlatLength = kMinFlatSize - kFlatOverhead;
 
-static constexpr size_t AllocatedSizeToTagUnchecked(size_t size) {
+constexpr size_t AllocatedSizeToTagUnchecked(size_t size) {
   return (size <= 1024) ? size / 8 : 128 + size / 32 - 1024 / 32;
 }
 
@@ -51,12 +51,12 @@ static_assert(kMinFlatSize / 8 >= FLAT, "");
 static_assert(AllocatedSizeToTagUnchecked(kMaxFlatSize) <= MAX_FLAT_TAG, "");
 
 // Helper functions for rounded div, and rounding to exact sizes.
-static size_t DivUp(size_t n, size_t m) { return (n + m - 1) / m; }
-static size_t RoundUp(size_t n, size_t m) { return DivUp(n, m) * m; }
+constexpr size_t DivUp(size_t n, size_t m) { return (n + m - 1) / m; }
+constexpr size_t RoundUp(size_t n, size_t m) { return DivUp(n, m) * m; }
 
 // Returns the size to the nearest equal or larger value that can be
 // expressed exactly as a tag value.
-static size_t RoundUpForTag(size_t size) {
+inline size_t RoundUpForTag(size_t size) {
   return RoundUp(size, (size <= 1024) ? 8 : 32);
 }
 
@@ -64,19 +64,19 @@ static size_t RoundUpForTag(size_t size) {
 // does not exactly match a 'tag expressible' size value. The result is
 // undefined if the size exceeds the maximum size that can be encoded in
 // a tag, i.e., if size is larger than TagToAllocatedSize(<max tag>).
-static uint8_t AllocatedSizeToTag(size_t size) {
+inline uint8_t AllocatedSizeToTag(size_t size) {
   const size_t tag = AllocatedSizeToTagUnchecked(size);
   assert(tag <= MAX_FLAT_TAG);
   return tag;
 }
 
 // Converts the provided tag to the corresponding allocated size
-static constexpr size_t TagToAllocatedSize(uint8_t tag) {
+constexpr size_t TagToAllocatedSize(uint8_t tag) {
   return (tag <= 128) ? (tag * 8) : (1024 + (tag - 128) * 32);
 }
 
 // Converts the provided tag to the corresponding available data length
-static constexpr size_t TagToLength(uint8_t tag) {
+constexpr size_t TagToLength(uint8_t tag) {
   return TagToAllocatedSize(tag) - kFlatOverhead;
 }