TaskScheduler [3/9] Task and Sequence

base/task_scheduler/sequence_sort_key.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/task_scheduler/sequence_sort_key.h"
+
+namespace base {
+namespace internal {
+
+SequenceSortKey::SequenceSortKey(TaskPriority priority,
+                                 TimeTicks next_task_sequenced_time)
+    : priority(priority), next_task_sequenced_time(next_task_sequenced_time) {}
+
+bool SequenceSortKey::operator<(const SequenceSortKey& other) const {
+  // This SequenceSortKey is considered less important than |other| if it has a
+  // lower priority or if it has the same priority but its next task was posted
+  // later than |other|'s.
+  const int priority_diff =
+      static_cast<TaskPriorityUnderlyingType>(priority) -
+      static_cast<TaskPriorityUnderlyingType>(other.priority);
+  return priority_diff != 0
+             ? priority_diff < 0
+             : next_task_sequenced_time > other.next_task_sequenced_time;
+}
+
+bool SequenceSortKey::operator>(const SequenceSortKey& other) const {
+  const int priority_diff =
+      static_cast<TaskPriorityUnderlyingType>(priority) -
+      static_cast<TaskPriorityUnderlyingType>(other.priority);
+  return priority_diff != 0
+             ? priority_diff > 0
+             : next_task_sequenced_time < other.next_task_sequenced_time;
+}
+
+}  // namespace internal
+}  // namespace base