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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/task/delayed_task_handle.h"
#include <utility>
#include "base/check.h"
namespace base {
DelayedTaskHandle::DelayedTaskHandle() = default;
DelayedTaskHandle::DelayedTaskHandle(std::unique_ptr<Delegate> delegate)
: delegate_(std::move(delegate)) {
DCHECK(IsValid());
}
DelayedTaskHandle::~DelayedTaskHandle() {
// A task handle should never be destroyed in a valid state. It should either
// have been executed, canceled or have had its task deleted.
DCHECK(!IsValid());
}
DelayedTaskHandle::DelayedTaskHandle(DelayedTaskHandle&& other) = default;
DelayedTaskHandle& DelayedTaskHandle::operator=(DelayedTaskHandle&& other) {
// A valid handle can't be overwritten by an assignment.
DCHECK(!IsValid());
delegate_ = std::move(other.delegate_);
return *this;
}
bool DelayedTaskHandle::IsValid() const {
return delegate_ && delegate_->IsValid();
}
void DelayedTaskHandle::CancelTask() {
// The delegate is responsible for cancelling the task.
if (delegate_) {
delegate_->CancelTask();
DCHECK(!delegate_->IsValid());
delegate_.reset();
}
}
} // namespace base
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