summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--absl/base/BUILD.bazel20
-rw-r--r--absl/base/CMakeLists.txt1
-rw-r--r--absl/base/internal/bits.h193
-rw-r--r--absl/base/internal/bits_test.cc97
-rw-r--r--absl/strings/BUILD.bazel2
-rw-r--r--absl/strings/CMakeLists.txt1
-rw-r--r--absl/strings/charconv.cc8
-rw-r--r--absl/strings/escaping.cc2
-rw-r--r--absl/strings/internal/bits.h53
-rw-r--r--absl/strings/numbers.cc6
-rw-r--r--absl/time/time.h31
11 files changed, 345 insertions, 69 deletions
diff --git a/absl/base/BUILD.bazel b/absl/base/BUILD.bazel
index 7063f96a..83d48f6b 100644
--- a/absl/base/BUILD.bazel
+++ b/absl/base/BUILD.bazel
@@ -427,3 +427,23 @@ cc_test(
"@com_github_google_benchmark//:benchmark_main",
],
)
+
+cc_library(
+ name = "bits",
+ hdrs = ["internal/bits.h"],
+ visibility = [
+ "//absl:__subpackages__",
+ ],
+ deps = [":core_headers"],
+)
+
+cc_test(
+ name = "bits_test",
+ size = "small",
+ srcs = ["internal/bits_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ deps = [
+ ":bits",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
diff --git a/absl/base/CMakeLists.txt b/absl/base/CMakeLists.txt
index 01d2af08..04a6eb31 100644
--- a/absl/base/CMakeLists.txt
+++ b/absl/base/CMakeLists.txt
@@ -31,6 +31,7 @@ list(APPEND BASE_PUBLIC_HEADERS
list(APPEND BASE_INTERNAL_HEADERS
"internal/atomic_hook.h"
+ "internal/bits.h"
"internal/cycleclock.h"
"internal/direct_mmap.h"
"internal/endian.h"
diff --git a/absl/base/internal/bits.h b/absl/base/internal/bits.h
new file mode 100644
index 00000000..bc7faaee
--- /dev/null
+++ b/absl/base/internal/bits.h
@@ -0,0 +1,193 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_BASE_INTERNAL_BITS_H_
+#define ABSL_BASE_INTERNAL_BITS_H_
+
+// This file contains bitwise ops which are implementation details of various
+// absl libraries.
+
+#include <cstdint>
+
+// Clang on Windows has __builtin_clzll; otherwise we need to use the
+// windows intrinsic functions.
+#if defined(_MSC_VER)
+#include <intrin.h>
+#if defined(_M_X64)
+#pragma intrinsic(_BitScanReverse64)
+#pragma intrinsic(_BitScanForward64)
+#endif
+#pragma intrinsic(_BitScanReverse)
+#pragma intrinsic(_BitScanForward)
+#endif
+
+#include "absl/base/attributes.h"
+
+#if defined(_MSC_VER)
+// We can achieve something similar to attribute((always_inline)) with MSVC by
+// using the __forceinline keyword, however this is not perfect. MSVC is
+// much less aggressive about inlining, and even with the __forceinline keyword.
+#define ABSL_BASE_INTERNAL_FORCEINLINE __forceinline
+#else
+// Use default attribute inline.
+#define ABSL_BASE_INTERNAL_FORCEINLINE inline ABSL_ATTRIBUTE_ALWAYS_INLINE
+#endif
+
+
+namespace absl {
+namespace base_internal {
+
+ABSL_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros64Slow(uint64_t n) {
+ int zeroes = 60;
+ if (n >> 32) zeroes -= 32, n >>= 32;
+ if (n >> 16) zeroes -= 16, n >>= 16;
+ if (n >> 8) zeroes -= 8, n >>= 8;
+ if (n >> 4) zeroes -= 4, n >>= 4;
+ return "\4\3\2\2\1\1\1\1\0\0\0\0\0\0\0"[n] + zeroes;
+}
+
+ABSL_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros64(uint64_t n) {
+#if defined(_MSC_VER) && defined(_M_X64)
+ // MSVC does not have __buitin_clzll. Use _BitScanReverse64.
+ unsigned long result = 0; // NOLINT(runtime/int)
+ if (_BitScanReverse64(&result, n)) {
+ return 63 - result;
+ }
+ return 64;
+#elif defined(_MSC_VER)
+ // MSVC does not have __buitin_clzll. Compose two calls to _BitScanReverse
+ unsigned long result = 0; // NOLINT(runtime/int)
+ if ((n >> 32) && _BitScanReverse(&result, n >> 32)) {
+ return 31 - result;
+ }
+ if (_BitScanReverse(&result, n)) {
+ return 63 - result;
+ }
+ return 64;
+#elif defined(__GNUC__)
+ // Use __builtin_clzll, which uses the following instructions:
+ // x86: bsr
+ // ARM64: clz
+ // PPC: cntlzd
+ static_assert(sizeof(unsigned long long) == sizeof(n), // NOLINT(runtime/int)
+ "__builtin_clzll does not take 64-bit arg");
+
+ // Handle 0 as a special case because __builtin_clzll(0) is undefined.
+ if (n == 0) {
+ return 64;
+ }
+ return __builtin_clzll(n);
+#else
+ return CountLeadingZeros64Slow(n);
+#endif
+}
+
+ABSL_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros32Slow(uint64_t n) {
+ int zeroes = 28;
+ if (n >> 16) zeroes -= 16, n >>= 16;
+ if (n >> 8) zeroes -= 8, n >>= 8;
+ if (n >> 4) zeroes -= 4, n >>= 4;
+ return "\4\3\2\2\1\1\1\1\0\0\0\0\0\0\0"[n] + zeroes;
+}
+
+ABSL_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros32(uint32_t n) {
+#if defined(_MSC_VER)
+ unsigned long result = 0; // NOLINT(runtime/int)
+ if (_BitScanReverse(&result, n)) {
+ return 31 - result;
+ }
+ return 32;
+#elif defined(__GNUC__)
+ // Use __builtin_clz, which uses the following instructions:
+ // x86: bsr
+ // ARM64: clz
+ // PPC: cntlzd
+ static_assert(sizeof(int) == sizeof(n),
+ "__builtin_clz does not take 32-bit arg");
+
+ // Handle 0 as a special case because __builtin_clz(0) is undefined.
+ if (n == 0) {
+ return 32;
+ }
+ return __builtin_clz(n);
+#else
+ return CountLeadingZeros32Slow(n);
+#endif
+}
+
+ABSL_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero64Slow(uint64_t n) {
+ int c = 63;
+ n &= ~n + 1;
+ if (n & 0x00000000FFFFFFFF) c -= 32;
+ if (n & 0x0000FFFF0000FFFF) c -= 16;
+ if (n & 0x00FF00FF00FF00FF) c -= 8;
+ if (n & 0x0F0F0F0F0F0F0F0F) c -= 4;
+ if (n & 0x3333333333333333) c -= 2;
+ if (n & 0x5555555555555555) c -= 1;
+ return c;
+}
+
+ABSL_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero64(uint64_t n) {
+#if defined(_MSC_VER) && defined(_M_X64)
+ unsigned long result = 0; // NOLINT(runtime/int)
+ _BitScanForward64(&result, n);
+ return result;
+#elif defined(_MSC_VER)
+ unsigned long result = 0; // NOLINT(runtime/int)
+ if (static_cast<uint32_t>(n) == 0) {
+ _BitScanForward(&result, n >> 32);
+ return result + 32;
+ }
+ _BitScanForward(&result, n);
+ return result;
+#elif defined(__GNUC__)
+ static_assert(sizeof(unsigned long long) == sizeof(n), // NOLINT(runtime/int)
+ "__builtin_ctzll does not take 64-bit arg");
+ return __builtin_ctzll(n);
+#else
+ return CountTrailingZerosNonZero64Slow(n);
+#endif
+}
+
+ABSL_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero32Slow(uint32_t n) {
+ int c = 31;
+ n &= ~n + 1;
+ if (n & 0x0000FFFF) c -= 16;
+ if (n & 0x00FF00FF) c -= 8;
+ if (n & 0x0F0F0F0F) c -= 4;
+ if (n & 0x33333333) c -= 2;
+ if (n & 0x55555555) c -= 1;
+ return c;
+}
+
+ABSL_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero32(uint32_t n) {
+#if defined(_MSC_VER)
+ unsigned long result = 0; // NOLINT(runtime/int)
+ _BitScanForward(&result, n);
+ return result;
+#elif defined(__GNUC__)
+ static_assert(sizeof(int) == sizeof(n),
+ "__builtin_ctz does not take 32-bit arg");
+ return __builtin_ctz(n);
+#else
+ return CountTrailingZerosNonZero32Slow(n);
+#endif
+}
+
+#undef ABSL_BASE_INTERNAL_FORCEINLINE
+
+} // namespace base_internal
+} // namespace absl
+
+#endif // ABSL_BASE_INTERNAL_BITS_H_
diff --git a/absl/base/internal/bits_test.cc b/absl/base/internal/bits_test.cc
new file mode 100644
index 00000000..e5d991d6
--- /dev/null
+++ b/absl/base/internal/bits_test.cc
@@ -0,0 +1,97 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/bits.h"
+
+#include "gtest/gtest.h"
+
+namespace {
+
+int CLZ64(uint64_t n) {
+ int fast = absl::base_internal::CountLeadingZeros64(n);
+ int slow = absl::base_internal::CountLeadingZeros64Slow(n);
+ EXPECT_EQ(fast, slow) << n;
+ return fast;
+}
+
+TEST(BitsTest, CountLeadingZeros64) {
+ EXPECT_EQ(64, CLZ64(uint64_t{}));
+ EXPECT_EQ(0, CLZ64(~uint64_t{}));
+
+ for (int index = 0; index < 64; index++) {
+ uint64_t x = static_cast<uint64_t>(1) << index;
+ const auto cnt = 63 - index;
+ ASSERT_EQ(cnt, CLZ64(x)) << index;
+ ASSERT_EQ(cnt, CLZ64(x + x - 1)) << index;
+ }
+}
+
+int CLZ32(uint32_t n) {
+ int fast = absl::base_internal::CountLeadingZeros32(n);
+ int slow = absl::base_internal::CountLeadingZeros32Slow(n);
+ EXPECT_EQ(fast, slow) << n;
+ return fast;
+}
+
+TEST(BitsTest, CountLeadingZeros32) {
+ EXPECT_EQ(32, CLZ32(uint32_t{}));
+ EXPECT_EQ(0, CLZ32(~uint32_t{}));
+
+ for (int index = 0; index < 32; index++) {
+ uint32_t x = static_cast<uint32_t>(1) << index;
+ const auto cnt = 31 - index;
+ ASSERT_EQ(cnt, CLZ32(x)) << index;
+ ASSERT_EQ(cnt, CLZ32(x + x - 1)) << index;
+ ASSERT_EQ(CLZ64(x), CLZ32(x) + 32);
+ }
+}
+
+int CTZ64(uint64_t n) {
+ int fast = absl::base_internal::CountTrailingZerosNonZero64(n);
+ int slow = absl::base_internal::CountTrailingZerosNonZero64Slow(n);
+ EXPECT_EQ(fast, slow) << n;
+ return fast;
+}
+
+TEST(BitsTest, CountTrailingZerosNonZero64) {
+ EXPECT_EQ(0, CTZ64(~uint64_t{}));
+
+ for (int index = 0; index < 64; index++) {
+ uint64_t x = static_cast<uint64_t>(1) << index;
+ const auto cnt = index;
+ ASSERT_EQ(cnt, CTZ64(x)) << index;
+ ASSERT_EQ(cnt, CTZ64(~(x - 1))) << index;
+ }
+}
+
+int CTZ32(uint32_t n) {
+ int fast = absl::base_internal::CountTrailingZerosNonZero32(n);
+ int slow = absl::base_internal::CountTrailingZerosNonZero32Slow(n);
+ EXPECT_EQ(fast, slow) << n;
+ return fast;
+}
+
+TEST(BitsTest, CountTrailingZerosNonZero32) {
+ EXPECT_EQ(0, CTZ32(~uint32_t{}));
+
+ for (int index = 0; index < 32; index++) {
+ uint32_t x = static_cast<uint32_t>(1) << index;
+ const auto cnt = index;
+ ASSERT_EQ(cnt, CTZ32(x)) << index;
+ ASSERT_EQ(cnt, CTZ32(~(x - 1))) << index;
+ }
+}
+
+
+} // namespace
diff --git a/absl/strings/BUILD.bazel b/absl/strings/BUILD.bazel
index 0cb752b5..6d7c2619 100644
--- a/absl/strings/BUILD.bazel
+++ b/absl/strings/BUILD.bazel
@@ -70,6 +70,7 @@ cc_library(
deps = [
":internal",
"//absl/base",
+ "//absl/base:bits",
"//absl/base:config",
"//absl/base:core_headers",
"//absl/base:endian",
@@ -87,7 +88,6 @@ cc_library(
"internal/utf8.cc",
],
hdrs = [
- "internal/bits.h",
"internal/char_map.h",
"internal/ostringstream.h",
"internal/resize_uninitialized.h",
diff --git a/absl/strings/CMakeLists.txt b/absl/strings/CMakeLists.txt
index cd122134..f3e41623 100644
--- a/absl/strings/CMakeLists.txt
+++ b/absl/strings/CMakeLists.txt
@@ -32,7 +32,6 @@ list(APPEND STRINGS_PUBLIC_HEADERS
list(APPEND STRINGS_INTERNAL_HEADERS
- "internal/bits.h"
"internal/char_map.h"
"internal/charconv_bigint.h"
"internal/charconv_parse.h"
diff --git a/absl/strings/charconv.cc b/absl/strings/charconv.cc
index 08c3947e..c7b8c98b 100644
--- a/absl/strings/charconv.cc
+++ b/absl/strings/charconv.cc
@@ -20,8 +20,8 @@
#include <cstring>
#include "absl/base/casts.h"
+#include "absl/base/internal/bits.h"
#include "absl/numeric/int128.h"
-#include "absl/strings/internal/bits.h"
#include "absl/strings/internal/charconv_bigint.h"
#include "absl/strings/internal/charconv_parse.h"
@@ -243,9 +243,9 @@ struct CalculatedFloat {
// minus the number of leading zero bits.)
int BitWidth(uint128 value) {
if (Uint128High64(value) == 0) {
- return 64 - strings_internal::CountLeadingZeros64(Uint128Low64(value));
+ return 64 - base_internal::CountLeadingZeros64(Uint128Low64(value));
}
- return 128 - strings_internal::CountLeadingZeros64(Uint128High64(value));
+ return 128 - base_internal::CountLeadingZeros64(Uint128High64(value));
}
// Calculates how far to the right a mantissa needs to be shifted to create a
@@ -518,7 +518,7 @@ CalculatedFloat CalculateFromParsedHexadecimal(
const strings_internal::ParsedFloat& parsed_hex) {
uint64_t mantissa = parsed_hex.mantissa;
int exponent = parsed_hex.exponent;
- int mantissa_width = 64 - strings_internal::CountLeadingZeros64(mantissa);
+ int mantissa_width = 64 - base_internal::CountLeadingZeros64(mantissa);
const int shift = NormalizedShiftSize<FloatType>(mantissa_width, exponent);
bool result_exact;
exponent += shift;
diff --git a/absl/strings/escaping.cc b/absl/strings/escaping.cc
index c8f18d86..4a45942d 100644
--- a/absl/strings/escaping.cc
+++ b/absl/strings/escaping.cc
@@ -304,7 +304,7 @@ bool CUnescapeInternal(absl::string_view source, bool leave_nulls_escaped,
ptrdiff_t dest_size;
if (!CUnescapeInternal(source,
leave_nulls_escaped,
- const_cast<char*>(dest->data()),
+ &(*dest)[0],
&dest_size,
error)) {
return false;
diff --git a/absl/strings/internal/bits.h b/absl/strings/internal/bits.h
deleted file mode 100644
index 901082cc..00000000
--- a/absl/strings/internal/bits.h
+++ /dev/null
@@ -1,53 +0,0 @@
-// Copyright 2018 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_STRINGS_INTERNAL_BITS_H_
-#define ABSL_STRINGS_INTERNAL_BITS_H_
-
-#include <cstdint>
-
-#if defined(_MSC_VER) && defined(_M_X64)
-#include <intrin.h>
-#pragma intrinsic(_BitScanReverse64)
-#endif
-
-namespace absl {
-namespace strings_internal {
-
-// Returns the number of leading 0 bits in a 64-bit value.
-inline int CountLeadingZeros64(uint64_t n) {
-#if defined(__GNUC__)
- static_assert(sizeof(unsigned long long) == sizeof(n), // NOLINT(runtime/int)
- "__builtin_clzll does not take 64bit arg");
- return n == 0 ? 64 : __builtin_clzll(n);
-#elif defined(_MSC_VER) && defined(_M_X64)
- unsigned long result; // NOLINT(runtime/int)
- if (_BitScanReverse64(&result, n)) {
- return 63 - result;
- }
- return 64;
-#else
- int zeroes = 60;
- if (n >> 32) zeroes -= 32, n >>= 32;
- if (n >> 16) zeroes -= 16, n >>= 16;
- if (n >> 8) zeroes -= 8, n >>= 8;
- if (n >> 4) zeroes -= 4, n >>= 4;
- return "\4\3\2\2\1\1\1\1\0\0\0\0\0\0\0\0"[n] + zeroes;
-#endif
-}
-
-} // namespace strings_internal
-} // namespace absl
-
-#endif // ABSL_STRINGS_INTERNAL_BITS_H_
diff --git a/absl/strings/numbers.cc b/absl/strings/numbers.cc
index cc878f5b..9309f9da 100644
--- a/absl/strings/numbers.cc
+++ b/absl/strings/numbers.cc
@@ -30,10 +30,10 @@
#include <memory>
#include <utility>
+#include "absl/base/internal/bits.h"
#include "absl/base/internal/raw_logging.h"
#include "absl/strings/ascii.h"
#include "absl/strings/charconv.h"
-#include "absl/strings/internal/bits.h"
#include "absl/strings/internal/memutil.h"
#include "absl/strings/str_cat.h"
@@ -344,7 +344,7 @@ static std::pair<uint64_t, uint64_t> Mul32(std::pair<uint64_t, uint64_t> num,
uint64_t bits128_up = (bits96_127 >> 32) + (bits64_127 < bits64_95);
if (bits128_up == 0) return {bits64_127, bits0_63};
- int shift = 64 - strings_internal::CountLeadingZeros64(bits128_up);
+ int shift = 64 - base_internal::CountLeadingZeros64(bits128_up);
uint64_t lo = (bits0_63 >> shift) + (bits64_127 << (64 - shift));
uint64_t hi = (bits64_127 >> shift) + (bits128_up << (64 - shift));
return {hi, lo};
@@ -375,7 +375,7 @@ static std::pair<uint64_t, uint64_t> PowFive(uint64_t num, int expfive) {
5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5,
5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5};
result = Mul32(result, powers_of_five[expfive & 15]);
- int shift = strings_internal::CountLeadingZeros64(result.first);
+ int shift = base_internal::CountLeadingZeros64(result.first);
if (shift != 0) {
result.first = (result.first << shift) + (result.second >> (64 - shift));
result.second = (result.second << shift);
diff --git a/absl/time/time.h b/absl/time/time.h
index d29d7e9a..f2a779f4 100644
--- a/absl/time/time.h
+++ b/absl/time/time.h
@@ -25,11 +25,22 @@
// * `absl::TimeZone` defines geopolitical time zone regions (as collected
// within the IANA Time Zone database (https://www.iana.org/time-zones)).
//
+// Note: Absolute times are distinct from civil times, which refer to the
+// human-scale time commonly represented by `YYYY-MM-DD hh:mm:ss`. The mapping
+// between absolute and civil times can be specified by use of time zones
+// (`absl::TimeZone` within this API). That is:
+//
+// Civil Time = F(Absolute Time, Time Zone)
+// Absolute Time = F(Civil Time, Time Zone)
+//
+// See civil_time.h for abstractions related to constructing and manipulating
+// civil time.
+//
// Example:
//
// absl::TimeZone nyc;
//
-// // LoadTimeZone may fail so it's always better to check for success.
+// // LoadTimeZone() may fail so it's always better to check for success.
// if (!absl::LoadTimeZone("America/New_York", &nyc)) {
// // handle error case
// }
@@ -496,7 +507,7 @@ inline std::ostream& operator<<(std::ostream& os, Duration d) {
// decimal numbers, each with an optional fractional part and a unit
// suffix. The valid suffixes are "ns", "us" "ms", "s", "m", and "h".
// Simple examples include "300ms", "-1.5h", and "2h45m". Parses "0" as
-// `ZeroDuration()`. Parses "inf" and "-inf" as +/- `InfiniteDuration()`.
+// `ZeroDuration()`. Parses "inf" and "-inf" as +/- `InfiniteDuration()`.
bool ParseDuration(const std::string& dur_string, Duration* d);
// Support for flag values of type Duration. Duration flags must be specified
@@ -689,7 +700,9 @@ constexpr Time InfinitePast() {
// Examples:
//
// absl::TimeZone lax;
-// if (!absl::LoadTimeZone("America/Los_Angeles", &lax)) { ... }
+// if (!absl::LoadTimeZone("America/Los_Angeles", &lax)) {
+// // handle error case
+// }
//
// // A unique civil time
// absl::TimeConversion jan01 =
@@ -759,7 +772,9 @@ TimeConversion ConvertDateTime(int64_t year, int mon, int day, int hour,
// Example:
//
// absl::TimeZone seattle;
-// if (!absl::LoadTimeZone("America/Los_Angeles", &seattle)) { ... }
+// if (!absl::LoadTimeZone("America/Los_Angeles", &seattle)) {
+// // handle error case
+// }
// absl::Time t = absl::FromDateTime(2017, 9, 26, 9, 30, 0, seattle);
Time FromDateTime(int64_t year, int mon, int day, int hour, int min, int sec,
TimeZone tz);
@@ -910,7 +925,9 @@ extern const char RFC1123_no_wday[]; // %d %b %E4Y %H:%M:%S %z
// Example:
//
// absl::TimeZone lax;
-// if (!absl::LoadTimeZone("America/Los_Angeles", &lax)) { ... }
+// if (!absl::LoadTimeZone("America/Los_Angeles", &lax)) {
+// // handle error case
+// }
// absl::Time t = absl::FromDateTime(2013, 1, 2, 3, 4, 5, lax);
//
// string f = absl::FormatTime("%H:%M:%S", t, lax); // "03:04:05"
@@ -1028,7 +1045,9 @@ std::string UnparseFlag(Time t);
// absl::TimeZone pst = absl::FixedTimeZone(-8 * 60 * 60);
// absl::TimeZone loc = absl::LocalTimeZone();
// absl::TimeZone lax;
-// if (!absl::LoadTimeZone("America/Los_Angeles", &lax)) { ... }
+// if (!absl::LoadTimeZone("America/Los_Angeles", &lax)) {
+// // handle error case
+// }
//
// See also:
// - https://github.com/google/cctz
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 09:37:03 +0000