Export of internal Abseil changes.

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e7f892a0b9b313b434c5f9e9a2365b377204b60e by Abseil Team <absl-team@google.com>:

Remove internal CaseEqual helper now that we have the equivalent absl::EqualsIgnoreCase.

PiperOrigin-RevId: 225189084

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722af2c74766d2fe3cee13c8dc886d39aedda597 by Abseil Team <absl-team@google.com>:

Add -Wno-extra-semi-stmt to silence that warning.

The [-Wno-extra-semi] is already disabled in the build.  This
change will allow the build to remain consistent across newer
versions of clang which are now issuing a new similiar warning
[-Wextra-semi-stmt]:

  https://clang.llvm.org/docs/ReleaseNotes.html#major-new-features
  https://clang.llvm.org/docs/DiagnosticsReference.html#wextra-semi-stmt

PiperOrigin-RevId: 225185101

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f7fd6244b4efcf0331631a54b7b0cf5f1f691a89 by CJ Johnson <johnsoncj@google.com>:

Move using directive in swap implementation

PiperOrigin-RevId: 225017825

--
3005841725df5b9cdb35c8a5319bb4c78b5dc2b7 by Abseil Team <absl-team@google.com>:

Update absl/strings/CMakeLists.txt to use new functions
i.e. absl_cc_(library|test)

PiperOrigin-RevId: 224860689

--
eeaf7099924b182472bfea3636ef6d9a39adfc50 by CJ Johnson <johnsoncj@google.com>:

Prefer public method over private for InlinedVector allocator access

PiperOrigin-RevId: 224825775

--
db9d218e3ca7ab400eef97778b720cb082a03281 by Eric Fiselier <ericwf@google.com>:

Take advantage of secret libc++ resize uninitialized function in string.

PiperOrigin-RevId: 224817877
GitOrigin-RevId: e7f892a0b9b313b434c5f9e9a2365b377204b60e
Change-Id: I051beee37ee03f0570bd2e068355ad75c8bdfcf8

absl/container/inlined_vector.h

@@ -149,7 +149,7 @@ class InlinedVector {
 
   // Creates a copy of `other` using `other`'s allocator.
   InlinedVector(const InlinedVector& other)
-      : InlinedVector(other, other.allocator()) {}
+      : InlinedVector(other, other.get_allocator()) {}
 
   // Creates a copy of `other` but with a specified allocator.
   InlinedVector(const InlinedVector& other, const allocator_type& alloc)
@@ -793,9 +793,9 @@ class InlinedVector {
   //
   // Swaps the contents of this inlined vector with the contents of `other`.
   void swap(InlinedVector& other) {
-    using std::swap;  // Augment ADL with `std::swap`.
     if (ABSL_PREDICT_FALSE(this == &other)) return;
 
+    using std::swap;  // Augment ADL with `std::swap`.
     if (allocated() && other.allocated()) {
       // Both out of line, so just swap the tag, allocation, and allocator.
       swap(tag(), other.tag());

absl/copts/copts.py

@@ -58,6 +58,7 @@ COPT_VARS = {
         # Turned off as they include valid C++ code.
         "-Wno-comma",
         "-Wno-extra-semi",
+        "-Wno-extra-semi-stmt",
         "-Wno-packed",
         "-Wno-padded",
         ###

absl/strings/internal/resize_uninitialized.h

@@ -18,6 +18,7 @@
 #define ABSL_STRINGS_INTERNAL_RESIZE_UNINITIALIZED_H_
 
 #include <string>
+#include <type_traits>
 #include <utility>
 
 #include "absl/base/port.h"
@@ -27,22 +28,24 @@ namespace absl {
 namespace strings_internal {
 
 // Is a subclass of true_type or false_type, depending on whether or not
-// T has a resize_uninitialized member.
-template <typename T, typename = void>
-struct HasResizeUninitialized : std::false_type {};
-template <typename T>
-struct HasResizeUninitialized<
-    T, absl::void_t<decltype(std::declval<T>().resize_uninitialized(237))>>
-    : std::true_type {};
+// T has a __resize_default_init member.
+template <typename string_type, typename = void>
+struct ResizeUninitializedTraits {
+  using HasMember = std::false_type;
+  static void Resize(string_type* s, size_t new_size) { s->resize(new_size); }
+};
 
+// __resize_default_init is provided by libc++ >= 8.0 and by Google's internal
+// ::string implementation.
 template <typename string_type>
-void ResizeUninit(string_type* s, size_t new_size, std::true_type) {
-  s->resize_uninitialized(new_size);
-}
-template <typename string_type>
-void ResizeUninit(string_type* s, size_t new_size, std::false_type) {
-  s->resize(new_size);
-}
+struct ResizeUninitializedTraits<
+    string_type, absl::void_t<decltype(std::declval<string_type&>()
+                                           .__resize_default_init(237))> > {
+  using HasMember = std::true_type;
+  static void Resize(string_type* s, size_t new_size) {
+    s->__resize_default_init(new_size);
+  }
+};
 
 // Returns true if the string implementation supports a resize where
 // the new characters added to the string are left untouched.
@@ -51,7 +54,7 @@ void ResizeUninit(string_type* s, size_t new_size, std::false_type) {
 // the previous function.)
 template <typename string_type>
 inline constexpr bool STLStringSupportsNontrashingResize(string_type*) {
-  return HasResizeUninitialized<string_type>();
+  return ResizeUninitializedTraits<string_type>::HasMember::value;
 }
 
 // Like str->resize(new_size), except any new characters added to "*str" as a
@@ -60,7 +63,7 @@ inline constexpr bool STLStringSupportsNontrashingResize(string_type*) {
 // store of the string with known data. Uses a Google extension to ::string.
 template <typename string_type, typename = void>
 inline void STLStringResizeUninitialized(string_type* s, size_t new_size) {
-  ResizeUninit(s, new_size, HasResizeUninitialized<string_type>());
+  ResizeUninitializedTraits<string_type>::Resize(s, new_size);
 }
 
 }  // namespace strings_internal

absl/strings/internal/resize_uninitialized_test.cc

@@ -24,44 +24,44 @@ struct resizable_string {
   void resize(size_t) { resize_call_count += 1; }
 };
 
-int resize_uninitialized_call_count = 0;
+int resize_default_init_call_count = 0;
 
-struct resize_uninitializable_string {
+struct resize_default_init_string {
   void resize(size_t) { resize_call_count += 1; }
-  void resize_uninitialized(size_t) { resize_uninitialized_call_count += 1; }
+  void __resize_default_init(size_t) { resize_default_init_call_count += 1; }
 };
 
 TEST(ResizeUninit, WithAndWithout) {
   resize_call_count = 0;
-  resize_uninitialized_call_count = 0;
+  resize_default_init_call_count = 0;
   {
     resizable_string rs;
 
     EXPECT_EQ(resize_call_count, 0);
-    EXPECT_EQ(resize_uninitialized_call_count, 0);
+    EXPECT_EQ(resize_default_init_call_count, 0);
     EXPECT_FALSE(
         absl::strings_internal::STLStringSupportsNontrashingResize(&rs));
     EXPECT_EQ(resize_call_count, 0);
-    EXPECT_EQ(resize_uninitialized_call_count, 0);
+    EXPECT_EQ(resize_default_init_call_count, 0);
     absl::strings_internal::STLStringResizeUninitialized(&rs, 237);
     EXPECT_EQ(resize_call_count, 1);
-    EXPECT_EQ(resize_uninitialized_call_count, 0);
+    EXPECT_EQ(resize_default_init_call_count, 0);
   }
 
   resize_call_count = 0;
-  resize_uninitialized_call_count = 0;
+  resize_default_init_call_count = 0;
   {
-    resize_uninitializable_string rus;
+    resize_default_init_string rus;
 
     EXPECT_EQ(resize_call_count, 0);
-    EXPECT_EQ(resize_uninitialized_call_count, 0);
+    EXPECT_EQ(resize_default_init_call_count, 0);
     EXPECT_TRUE(
         absl::strings_internal::STLStringSupportsNontrashingResize(&rus));
     EXPECT_EQ(resize_call_count, 0);
-    EXPECT_EQ(resize_uninitialized_call_count, 0);
+    EXPECT_EQ(resize_default_init_call_count, 0);
     absl::strings_internal::STLStringResizeUninitialized(&rus, 237);
     EXPECT_EQ(resize_call_count, 0);
-    EXPECT_EQ(resize_uninitialized_call_count, 1);
+    EXPECT_EQ(resize_default_init_call_count, 1);
   }
 }
 

absl/strings/match.cc

@@ -18,15 +18,6 @@
 
 namespace absl {
 
-namespace {
-bool CaseEqual(absl::string_view piece1, absl::string_view piece2) {
-  return (piece1.size() == piece2.size() &&
-          0 == strings_internal::memcasecmp(piece1.data(), piece2.data(),
-                                            piece1.size()));
-  // memcasecmp uses ascii_tolower().
-}
-}  // namespace
-
 bool EqualsIgnoreCase(absl::string_view piece1, absl::string_view piece2) {
   return (piece1.size() == piece2.size() &&
           0 == absl::strings_internal::memcasecmp(piece1.data(), piece2.data(),
@@ -36,12 +27,12 @@ bool EqualsIgnoreCase(absl::string_view piece1, absl::string_view piece2) {
 
 bool StartsWithIgnoreCase(absl::string_view text, absl::string_view prefix) {
   return (text.size() >= prefix.size()) &&
-         CaseEqual(text.substr(0, prefix.size()), prefix);
+         EqualsIgnoreCase(text.substr(0, prefix.size()), prefix);
 }
 
 bool EndsWithIgnoreCase(absl::string_view text, absl::string_view suffix) {
   return (text.size() >= suffix.size()) &&
-         CaseEqual(text.substr(text.size() - suffix.size()), suffix);
+         EqualsIgnoreCase(text.substr(text.size() - suffix.size()), suffix);
 }
 
 }  // namespace absl