chromium/third_party/skia/include/private/SkIDChangeListener.h

/*
 * Copyright 2020 Google LLC
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef SkIDChangeListener_DEFINED
#define SkIDChangeListener_DEFINED

#include "include/core/SkRefCnt.h"
#include "include/private/base/SkMutex.h"
#include "include/private/base/SkTArray.h"
#include "include/private/base/SkThreadAnnotations.h"

#include <atomic>

/**
 * Used to be notified when a gen/unique ID is invalidated, typically to preemptively purge
 * associated items from a cache that are no longer reachable. The listener can
 * be marked for deregistration if the cached item is remove before the listener is
 * triggered. This prevents unbounded listener growth when cache items are routinely
 * removed before the gen ID/unique ID is invalidated.
 */
class SkIDChangeListener : public SkRefCnt { … };

#endif