diff options
| -rw-r--r-- | absl/container/flat_hash_map.h | 2 | ||||
| -rw-r--r-- | absl/memory/memory.h | 24 | ||||
| -rw-r--r-- | absl/synchronization/internal/per_thread_sem_test.cc | 7 | ||||
| -rw-r--r-- | absl/synchronization/notification_test.cc | 9 |
4 files changed, 31 insertions, 11 deletions
diff --git a/absl/container/flat_hash_map.h b/absl/container/flat_hash_map.h index 9e7f682180e5..e5570d100441 100644 --- a/absl/container/flat_hash_map.h +++ b/absl/container/flat_hash_map.h @@ -88,7 +88,7 @@ struct FlatHashMapPolicy; // {{"a", "huey"}, {"b", "dewey"}, {"c", "louie"}}; // // // Insert a new element into the flat hash map -// ducks.insert({"d", "donald"}}; +// ducks.insert({"d", "donald"}); // // // Force a rehash of the flat hash map // ducks.rehash(0); diff --git a/absl/memory/memory.h b/absl/memory/memory.h index a80aab0af641..1eaec0f40aea 100644 --- a/absl/memory/memory.h +++ b/absl/memory/memory.h @@ -39,16 +39,30 @@ namespace absl { // Function Template: WrapUnique() // ----------------------------------------------------------------------------- // -// Adopts ownership from a raw pointer and transfers it to the returned -// `std::unique_ptr`, whose type is deduced. DO NOT specify the template type T -// when calling WrapUnique. +// Adopts ownership from a raw pointer and transfers it to the returned +// `std::unique_ptr`, whose type is deduced. Because of this deduction, *do not* +// specify the template type `T` when calling `WrapUnique`. // // Example: // X* NewX(int, int); // auto x = WrapUnique(NewX(1, 2)); // 'x' is std::unique_ptr<X>. // -// `absl::WrapUnique` is useful for capturing the output of a raw pointer -// factory. However, prefer 'absl::make_unique<T>(args...) over +// The purpose of WrapUnique is to automatically deduce the pointer type. If you +// wish to make the type explicit, for readability reasons or because you prefer +// to use a base-class pointer rather than a derived one, just use +// `std::unique_ptr` directly. +// +// Example: +// X* Factory(int, int); +// auto x = std::unique_ptr<X>(Factory(1, 2)); +// - or - +// std::unique_ptr<X> x(Factory(1, 2)); +// +// This has the added advantage of working whether Factory returns a raw +// pointer or a `std::unique_ptr`. +// +// While `absl::WrapUnique` is useful for capturing the output of a raw +// pointer factory, prefer 'absl::make_unique<T>(args...)' over // 'absl::WrapUnique(new T(args...))'. // // auto x = WrapUnique(new X(1, 2)); // works, but nonideal. diff --git a/absl/synchronization/internal/per_thread_sem_test.cc b/absl/synchronization/internal/per_thread_sem_test.cc index 2b52ea76ab0e..c29d8403df43 100644 --- a/absl/synchronization/internal/per_thread_sem_test.cc +++ b/absl/synchronization/internal/per_thread_sem_test.cc @@ -153,12 +153,15 @@ TEST_F(PerThreadSemTest, WithTimeout) { TEST_F(PerThreadSemTest, Timeouts) { absl::Time timeout = absl::Now() + absl::Milliseconds(50); + // Allow for a slight early return, to account for quality of implementation + // issues on various platforms. + const absl::Duration slop = absl::Microseconds(200); EXPECT_FALSE(Wait(timeout)); - EXPECT_LE(timeout, absl::Now()); + EXPECT_LE(timeout, absl::Now() + slop); absl::Time negative_timeout = absl::UnixEpoch() - absl::Milliseconds(100); EXPECT_FALSE(Wait(negative_timeout)); - EXPECT_LE(negative_timeout, absl::Now()); // trivially true :) + EXPECT_LE(negative_timeout, absl::Now() + slop); // trivially true :) Post(GetOrCreateCurrentThreadIdentity()); // The wait here has an expired timeout, but we have a wake to consume, diff --git a/absl/synchronization/notification_test.cc b/absl/synchronization/notification_test.cc index 9b3b6a5a9e84..d8708d551a15 100644 --- a/absl/synchronization/notification_test.cc +++ b/absl/synchronization/notification_test.cc @@ -71,10 +71,13 @@ static void BasicTests(bool notify_before_waiting, Notification* notification) { notification->WaitForNotificationWithTimeout(absl::Milliseconds(0))); EXPECT_FALSE(notification->WaitForNotificationWithDeadline(absl::Now())); + const absl::Duration delay = absl::Milliseconds(50); + // Allow for a slight early return, to account for quality of implementation + // issues on various platforms. + const absl::Duration slop = absl::Microseconds(200); absl::Time start = absl::Now(); - EXPECT_FALSE( - notification->WaitForNotificationWithTimeout(absl::Milliseconds(50))); - EXPECT_LE(start + absl::Milliseconds(50), absl::Now()); + EXPECT_FALSE(notification->WaitForNotificationWithTimeout(delay)); + EXPECT_LE(start + delay, absl::Now() + slop); ThreadSafeCounter ready_counter; ThreadSafeCounter done_counter; |