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// Copyright 2022 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef SRC_DAWN_NATIVE_REFCOUNTEDWITHEXTERNALCOUNT_H_
#define SRC_DAWN_NATIVE_REFCOUNTEDWITHEXTERNALCOUNT_H_
#include "dawn/common/RefCounted.h"
namespace dawn::native {
// RecCountedWithExternalCount is a version of RefCounted which tracks a separate
// refcount for calls to APIReference/APIRelease (refs added/removed by the application).
// The external refcount starts at 1, and the total refcount starts at 1 - i.e. the first
// ref is the external ref.
// Then, when the external refcount drops to zero, WillDropLastExternalRef is called.
// The derived class should override the behavior of WillDropLastExternalRef.
class RefCountedWithExternalCount : private RefCounted {
public:
using RefCounted::RefCounted;
using RefCounted::Reference;
using RefCounted::Release;
void APIReference();
void APIRelease();
private:
virtual void WillDropLastExternalRef() = 0;
RefCount mExternalRefCount;
};
} // namespace dawn::native
#endif // SRC_DAWN_NATIVE_REFCOUNTEDWITHEXTERNALCOUNT_H_