Fast growing to the next capacity based on carbon hash table ideas.

"Classical" growth is type erased and may become slower than before. Such growth is only used for usecases reserve/rehash non empty tables.

PiperOrigin-RevId: 744049527
Change-Id: I13e89b324f3bdcfdbb7a433c45fbfc17ade7f8de

Author: goldvitaly

CMake/AbseilDll.cmake

@@ -94,6 +94,7 @@ set(ABSL_INTERNAL_DLL_FILES
   "container/internal/raw_hash_map.h"
   "container/internal/raw_hash_set.cc"
   "container/internal/raw_hash_set.h"
+  "container/internal/raw_hash_set_resize_impl.h"
   "container/internal/tracked.h"
   "container/node_hash_map.h"
   "container/node_hash_set.h"

absl/container/BUILD.bazel

@@ -693,6 +693,27 @@ cc_library(
     ],
 )
 
+cc_library(
+    name = "raw_hash_set_resize_impl",
+    hdrs = ["internal/raw_hash_set_resize_impl.h"],
+    copts = ABSL_DEFAULT_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = ["//absl/base:config"],
+)
+
+cc_test(
+    name = "raw_hash_set_resize_impl_test",
+    srcs = ["internal/raw_hash_set_resize_impl_test.cc"],
+    copts = ABSL_TEST_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":raw_hash_set_resize_impl",
+        "//absl/base:config",
+        "@googletest//:gtest",
+        "@googletest//:gtest_main",
+    ],
+)
+
 cc_library(
     name = "raw_hash_set",
     srcs = ["internal/raw_hash_set.cc"],
@@ -709,6 +730,7 @@ cc_library(
         ":hashtable_control_bytes",
         ":hashtable_debug_hooks",
         ":hashtablez_sampler",
+        ":raw_hash_set_resize_impl",
         "//absl/base:config",
         "//absl/base:core_headers",
         "//absl/base:dynamic_annotations",
@@ -746,6 +768,7 @@ cc_test(
         ":hashtablez_sampler",
         ":node_hash_set",
         ":raw_hash_set",
+        ":raw_hash_set_resize_impl",
         ":test_allocator",
         ":test_instance_tracker",
         "//absl/base",

absl/container/CMakeLists.txt

@@ -828,6 +828,32 @@ absl_cc_test(
     GTest::gmock_main
 )
 
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+  NAME
+    raw_hash_set_resize_impl
+  HDRS
+    "internal/raw_hash_set_resize_impl.h"
+  COPTS
+    ${ABSL_DEFAULT_COPTS}
+  DEPS
+    absl::config
+  PUBLIC
+)
+
+absl_cc_test(
+  NAME
+    raw_hash_set_resize_impl_test
+  SRCS
+    "internal/raw_hash_set_resize_impl_test.cc"
+  COPTS
+    ${ABSL_TEST_COPTS}
+  DEPS
+    absl::config
+    absl::raw_hash_set_resize_impl
+    GTest::gmock_main
+)
+
 absl_cc_test(
   NAME
     raw_hash_set_allocator_test