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// 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/base_export.h"
#include "base/task_scheduler/task_traits.h"
#include "base/time/time.h"
namespace base {
namespace internal {
// An immutable but assignable representation of the priority of a Sequence.
class BASE_EXPORT SequenceSortKey final {
SequenceSortKey(TaskPriority priority, TimeTicks next_task_sequenced_time);
TaskPriority priority() const { return priority_; }
bool operator<(const SequenceSortKey& other) const;
bool operator>(const SequenceSortKey& other) const { return other < *this; }
bool operator==(const SequenceSortKey& other) const {
return priority_ == other.priority_ &&
next_task_sequenced_time_ == other.next_task_sequenced_time_;
bool operator!=(const SequenceSortKey& other) const {
return !(other == *this);
// The private section allows this class to keep its immutable property while
// being copy-assignable (i.e. instead of making its members const).
// Highest task priority in the sequence at the time this sort key was
// created.
TaskPriority priority_;
// Sequenced time of the next task to run in the sequence at the time this
// sort key was created.
TimeTicks next_task_sequenced_time_;
} // namespace internal
} // namespace base