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Changes imported from Abseil "staging" branch:

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- 3e05f2c346a9faf07088c49d590d49a9199e7edd Simplify Duration's operator-() by Jorg Brown <jorg@google.com>
  - 3c4942375a6d17e887bb6ab7cf2d0e763d58a511 Rewrite `noexcept(noexcept(allocator_type()))` to instead... by Matt Calabrese <calabrese@google.com>
  - 02f35a684201a6aa9f70e8b0a041993676f2d230 Fix comment on remove_prefix since the function is not re... by Abseil Team <absl-team@google.com>
  - ceb40aba8031e0ccec9cd49da844882df100c56f Fix mutex_test under TSAN. by Derek Mauro <dmauro@google.com>
  - 7bd12e7ddc5d074e1b9c9f037879211fa1d81f8c Slight wording tweaks for "adopting" wrappers by Abseil Team <absl-team@google.com>
  - c3580afe092e0357d40b1769314f36da1b887c65 Internal cleanup. by Greg Miller <jgm@google.com>

GitOrigin-RevId: 3e05f2c346a9faf07088c49d590d49a9199e7edd
Change-Id: If3df72fba3803398cfcbb323fb4cb84ec55511aa
This commit is contained in:
Abseil Team 2017-10-10 17:07:46 -07:00 • committed by Gennadiy Rozental
parent 962e9931d5
commit 029795a9b5
7 changed files with 93 additions and 96 deletions
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2
absl/time/internal/test_util.cc
View file

@ -63,7 +63,7 @@ const struct ZoneInfo {
{"US/Pacific", //
reinterpret_cast<char*>(America_Los_Angeles), America_Los_Angeles_len},
// Allows use of the local time zone from a common system-specific location.
// Allows use of the local time zone from a system-specific location.
#ifdef _MSC_VER
{"localtime", //
reinterpret_cast<char*>(America_Los_Angeles), America_Los_Angeles_len},

37
absl/time/time.h
View file

@ -1126,8 +1126,10 @@ constexpr Duration OppositeInfinity(Duration d) {
: MakeDuration(std::numeric_limits<int64_t>::min(), ~0U);
}
// Returns (-n)-1 (equivalently -(n+1)) without overflowing on any input value.
// Returns (-n)-1 (equivalently -(n+1)) without avoidable overflow.
constexpr int64_t NegateAndSubtractOne(int64_t n) {
// Note: Good compilers will optimize this expression to ~n when using
// a two's-complement representation (which is required for int64_t).
return (n < 0) ? -(n + 1) : (-n) - 1;
}
@ -1232,31 +1234,26 @@ constexpr bool operator==(Duration lhs, Duration rhs) {
constexpr Duration operator-(Duration d) {
// This is a little interesting because of the special cases.
//
// Infinities stay infinite, and just change direction.
// If rep_lo_ is zero, we have it easy; it's safe to negate rep_hi_, we're
// dealing with an integral number of seconds, and the only special case is
// the maximum negative finite duration, which can't be negated.
//
// The maximum negative finite duration can't be negated (at least, not
// on a two's complement machine), so we return infinity for that case.
// Next we dispatch the case where rep_lo_ is zero, observing that it's
// safe to negate rep_hi_ in this case because it's not int64_t-min (or
// else we'd have handled it above, returning InfiniteDuration()).
// Infinities stay infinite, and just change direction.
//
// Finally we're in the case where rep_lo_ is non-zero, and we can borrow
// a second's worth of ticks and avoid overflow (as negating int64_t-min + 1
// is safe).
return time_internal::IsInfiniteDuration(d)
? time_internal::OppositeInfinity(d)
: (time_internal::GetRepHi(d) ==
std::numeric_limits<int64_t>::min() &&
time_internal::GetRepLo(d) == 0)
return time_internal::GetRepLo(d) == 0
? time_internal::GetRepHi(d) == std::numeric_limits<int64_t>::min()
? InfiniteDuration()
: (time_internal::GetRepLo(d) == 0)
? time_internal::MakeDuration(
-time_internal::GetRepHi(d))
: time_internal::MakeDuration(
time_internal::NegateAndSubtractOne(
time_internal::GetRepHi(d)),
time_internal::kTicksPerSecond -
time_internal::GetRepLo(d));
: time_internal::MakeDuration(-time_internal::GetRepHi(d))
: time_internal::IsInfiniteDuration(d)
? time_internal::OppositeInfinity(d)
: time_internal::MakeDuration(
time_internal::NegateAndSubtractOne(
time_internal::GetRepHi(d)),
time_internal::kTicksPerSecond -
time_internal::GetRepLo(d));
}
constexpr Duration Nanoseconds(int64_t n) {