Export of internal Abseil changes.

--
4e043a11b4c10a24e84046827ee16f47e11e35cc by Abseil Team <absl-team@google.com>:

Merge of https://github.com/abseil/abseil-cpp/pull/136

PiperOrigin-RevId: 218197648

--
e61f06e1e601061a443feaa8c5207c52437bd641 by Abseil Team <absl-team@google.com>:

Don't include <iostream> into int128, it's wasteful

Including iostream emits a global constructor for initializing std::cout and
friends, which isn't actually used by this file.

PiperOrigin-RevId: 218156386

--
8a6c82396e4c956be7f285328aec131cb4965f16 by Xiaoyi Zhang <zhangxy@google.com>:

Fix MSVC compiler warnings on discarding return values of functions with 'nodiscard'
attribute.

PiperOrigin-RevId: 217883401

--
abf3e3a0f22bc4070df9dbc9a4ef4d883ed686bf by Tom Manshreck <shreck@google.com>:

Update public README to add new libraries

PiperOrigin-RevId: 217879399

--
43b3b420a4e861711abbfbd497b8f2b3de17ec8c by Abseil Team <absl-team@google.com>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 217780963

--
1c8831947ca6a65a63842e6bd5f37a7c102a4e1b by Abseil Team <absl-team@google.com>:

Fix typo in a comment (missing comma in usage example).

PiperOrigin-RevId: 217776645
GitOrigin-RevId: 4e043a11b4c10a24e84046827ee16f47e11e35cc
Change-Id: I8999ae928da7a0030b4ecfd8d13da8522fdd013a

README.md

@@ -63,10 +63,14 @@ Abseil contains the following C++ library components:
   <br /> The `algorithm` library contains additions to the C++ `<algorithm>`
   library and container-based versions of such algorithms.
 * [`container`](absl/container/)
-  <br /> The `container` library contains additional STL-style containers.
+  <br /> The `container` library contains additional STL-style containers,
+  including Abseil's unordered "Swiss table" containers.
 * [`debugging`](absl/debugging/)
   <br /> The `debugging` library contains code useful for enabling leak
-  checks. Future updates will add stacktrace and symbolization utilities.
+  checks, and stacktrace and symbolization utilities.
+* [`hash`](absl/hash/)
+  <br /> The `hash` library contains the hashing framework and default hash
+  functor implementations for hashable types in Abseil.
 * [`memory`](absl/memory/)
   <br /> The `memory` library contains C++11-compatible versions of
   `std::make_unique()` and related memory management facilities.
@@ -90,6 +94,8 @@ Abseil contains the following C++ library components:
 * [`types`](absl/types/)
   <br /> The `types` library contains non-container utility types, like a
   C++11-compatible version of the C++17 `std::optional` type.
+* [`utility`](absl/utility/)
+  <br /> The `utility` library contains utility and helper code.
 
 ## License
 

absl/container/CMakeLists.txt

@@ -48,11 +48,9 @@ list(APPEND CONTAINER_INTERNAL_HEADERS
 )
 
 
-absl_library(
+absl_header_library(
   TARGET
     absl_container
-  SOURCES
-    "internal/raw_hash_set.cc"
   EXPORT_NAME
     container
 )
@@ -164,13 +162,3 @@ absl_test(
   PUBLIC_LIBRARIES
     ${TEST_INSTANCE_TRACKER_TEST_PUBLIC_LIBRARIES}
 )
-
-
-absl_test(
-  TARGET
-    raw_hash_set_test
-  SOURCES
-    "internal/raw_hash_set_test.cc"
-  PUBLIC_LIBRARIES
-    absl::base absl::hash absl_throw_delegate test_instance_tracker_lib
-)

absl/memory/CMakeLists.txt

@@ -66,6 +66,3 @@ absl_test(
   PRIVATE_COMPILE_FLAGS
     ${ABSL_EXCEPTIONS_FLAG}
 )
-
-
-

absl/memory/memory_test.cc

@@ -145,7 +145,7 @@ TEST(Make_UniqueTest, NotAmbiguousWithStdMakeUnique) {
     explicit TakesStdType(const std::vector<int> &vec) {}
   };
   using absl::make_unique;
-  make_unique<TakesStdType>(std::vector<int>());
+  (void)make_unique<TakesStdType>(std::vector<int>());
 }
 
 #if 0

absl/numeric/int128.cc

@@ -17,7 +17,7 @@
 #include <stddef.h>
 #include <cassert>
 #include <iomanip>
-#include <iostream>  // NOLINT(readability/streams)
+#include <ostream>  // NOLINT(readability/streams)
 #include <sstream>
 #include <string>
 #include <type_traits>

absl/strings/CMakeLists.txt

@@ -460,4 +460,3 @@ absl_test(
     absl::base
 )
 
-

absl/strings/string_view_benchmark.cc

@@ -151,7 +151,7 @@ void BM_find_string_view_len_one(benchmark::State& state) {
   std::string haystack(state.range(0), '0');
   absl::string_view s(haystack);
   for (auto _ : state) {
-    s.find("x");  // not present; length 1
+    benchmark::DoNotOptimize(s.find("x"));  // not present; length 1
   }
 }
 BENCHMARK(BM_find_string_view_len_one)->Range(1, 1 << 20);
@@ -160,7 +160,7 @@ void BM_find_string_view_len_two(benchmark::State& state) {
   std::string haystack(state.range(0), '0');
   absl::string_view s(haystack);
   for (auto _ : state) {
-    s.find("xx");  // not present; length 2
+    benchmark::DoNotOptimize(s.find("xx"));  // not present; length 2
   }
 }
 BENCHMARK(BM_find_string_view_len_two)->Range(1, 1 << 20);
@@ -169,7 +169,7 @@ void BM_find_one_char(benchmark::State& state) {
   std::string haystack(state.range(0), '0');
   absl::string_view s(haystack);
   for (auto _ : state) {
-    s.find('x');  // not present
+    benchmark::DoNotOptimize(s.find('x'));  // not present
   }
 }
 BENCHMARK(BM_find_one_char)->Range(1, 1 << 20);
@@ -178,7 +178,7 @@ void BM_rfind_one_char(benchmark::State& state) {
   std::string haystack(state.range(0), '0');
   absl::string_view s(haystack);
   for (auto _ : state) {
-    s.rfind('x');  // not present
+    benchmark::DoNotOptimize(s.rfind('x'));  // not present
   }
 }
 BENCHMARK(BM_rfind_one_char)->Range(1, 1 << 20);
@@ -193,7 +193,7 @@ void BM_worst_case_find_first_of(benchmark::State& state, int haystack_len) {
 
   absl::string_view s(haystack);
   for (auto _ : state) {
-    s.find_first_of(needle);
+    benchmark::DoNotOptimize(s.find_first_of(needle));
   }
 }
 

absl/strings/string_view_test.cc

@@ -678,9 +678,9 @@ TEST(StringViewTest, STL2Substr) {
   EXPECT_EQ(a.substr(23, absl::string_view::npos), c);
   // throw exception
 #ifdef ABSL_HAVE_EXCEPTIONS
-  EXPECT_THROW(a.substr(99, 2), std::out_of_range);
+  EXPECT_THROW((void)a.substr(99, 2), std::out_of_range);
 #else
-  EXPECT_DEATH(a.substr(99, 2), "absl::string_view::substr");
+  EXPECT_DEATH((void)a.substr(99, 2), "absl::string_view::substr");
 #endif
 }
 

absl/time/civil_time.h

@@ -342,7 +342,7 @@ using CivilYear =
 //
 //   absl::CivilSecond cs = ...;
 //   absl::civil_year_t y = cs.year();
-//   cs = absl::CivilSecond(y, 1, 1, 0, 0 0);  // CivilSecond(CivilYear(cs))
+//   cs = absl::CivilSecond(y, 1, 1, 0, 0, 0);  // CivilSecond(CivilYear(cs))
 //
 using civil_year_t = time_internal::cctz::year_t;
 

absl/time/internal/cctz/src/tzfile.h

+/* Layout and location of TZif files.  */
+
 #ifndef TZFILE_H
 
 #define TZFILE_H

absl/time/internal/cctz/testdata/version

-2018e-2-g99dd695
+2018f-1-g401c42d

absl/time/internal/cctz/testdata/zoneinfo/zone1970.tab

-# tz zone descriptions
+# tzdb timezone descriptions
 #
 # This file is in the public domain.
 #
-# From Paul Eggert (2017-10-01):
-# This file contains a table where each row stands for a zone where
-# civil time stamps have agreed since 1970.  Columns are separated by
+# From Paul Eggert (2018-06-27):
+# This file contains a table where each row stands for a timezone where
+# civil timestamps have agreed since 1970.  Columns are separated by
 # a single tab.  Lines beginning with '#' are comments.  All text uses
 # UTF-8 encoding.  The columns of the table are as follows:
 #
-# 1.  The countries that overlap the zone, as a comma-separated list
+# 1.  The countries that overlap the timezone, as a comma-separated list
 #     of ISO 3166 2-character country codes.  See the file 'iso3166.tab'.
-# 2.  Latitude and longitude of the zone's principal location
+# 2.  Latitude and longitude of the timezone's principal location
 #     in ISO 6709 sign-degrees-minutes-seconds format,
 #     either ±DDMM±DDDMM or ±DDMMSS±DDDMMSS,
 #     first latitude (+ is north), then longitude (+ is east).
-# 3.  Zone name used in value of TZ environment variable.
-#     Please see the theory.html file for how zone names are chosen.
-#     If multiple zones overlap a country, each has a row in the
+# 3.  Timezone name used in value of TZ environment variable.
+#     Please see the theory.html file for how these names are chosen.
+#     If multiple timezones overlap a country, each has a row in the
 #     table, with each column 1 containing the country code.
-# 4.  Comments; present if and only if a country has multiple zones.
+# 4.  Comments; present if and only if a country has multiple timezones.
 #
-# If a zone covers multiple countries, the most-populous city is used,
+# If a timezone covers multiple countries, the most-populous city is used,
 # and that country is listed first in column 1; any other countries
 # are listed alphabetically by country code.  The table is sorted
 # first by country code, then (if possible) by an order within the
 # country that (1) makes some geographical sense, and (2) puts the
-# most populous zones first, where that does not contradict (1).
+# most populous timezones first, where that does not contradict (1).
 #
-# This table is intended as an aid for users, to help them select time
-# zone data entries appropriate for their practical needs.  It is not
-# intended to take or endorse any position on legal or territorial claims.
+# This table is intended as an aid for users, to help them select timezones
+# appropriate for their practical needs.  It is not intended to take or
+# endorse any position on legal or territorial claims.
 #
 #country-
 #codes	coordinates	TZ	comments
@@ -231,7 +231,7 @@ MM	+1647+09610	Asia/Yangon
 MN	+4755+10653	Asia/Ulaanbaatar	Mongolia (most areas)
 MN	+4801+09139	Asia/Hovd	Bayan-Ölgii, Govi-Altai, Hovd, Uvs, Zavkhan
 MN	+4804+11430	Asia/Choibalsan	Dornod, Sükhbaatar
-MO	+2214+11335	Asia/Macau
+MO	+221150+1133230	Asia/Macau
 MQ	+1436-06105	America/Martinique
 MT	+3554+01431	Europe/Malta
 MU	-2010+05730	Indian/Mauritius

absl/types/optional_test.cc

@@ -1042,9 +1042,9 @@ TEST(optionalTest, Value) {
   // test exception throw on value()
   absl::optional<int> empty;
 #ifdef ABSL_HAVE_EXCEPTIONS
-  EXPECT_THROW(empty.value(), absl::bad_optional_access);
+  EXPECT_THROW((void)empty.value(), absl::bad_optional_access);
 #else
-  EXPECT_DEATH(empty.value(), "Bad optional access");
+  EXPECT_DEATH((void)empty.value(), "Bad optional access");
 #endif
 
   // test constexpr value()

absl/types/variant_test.cc

@@ -52,7 +52,7 @@
 #endif  // ABSL_HAVE_EXCEPTIONS
 
 #define ABSL_VARIANT_TEST_EXPECT_BAD_VARIANT_ACCESS(...)                 \
-  ABSL_VARIANT_TEST_EXPECT_FAIL((__VA_ARGS__), absl::bad_variant_access, \
+  ABSL_VARIANT_TEST_EXPECT_FAIL((void)(__VA_ARGS__), absl::bad_variant_access, \
                                 "Bad variant access")
 
 struct Hashable {};