зеркало из https://github.com/mozilla/gecko-dev.git
52 строки
1.5 KiB
C++
52 строки
1.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_mscom_Aggregation_h
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#define mozilla_mscom_Aggregation_h
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#include "mozilla/Attributes.h"
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namespace mozilla {
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namespace mscom {
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/**
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* This is used for stabilizing a COM object's reference count during
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* construction when that object aggregates other objects. Since the aggregated
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* object(s) may AddRef() or Release(), we need to artifically boost the
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* refcount to prevent premature destruction. Note that we increment/decrement
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* instead of AddRef()/Release() in this class because we want to adjust the
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* refcount without causing any other side effects (like object destruction).
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*/
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template <typename RefCntT>
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class MOZ_RAII StabilizedRefCount
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{
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public:
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explicit StabilizedRefCount(RefCntT& aRefCnt)
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: mRefCnt(aRefCnt)
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{
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++aRefCnt;
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}
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~StabilizedRefCount()
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{
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--mRefCnt;
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}
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StabilizedRefCount(const StabilizedRefCount&) = delete;
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StabilizedRefCount(StabilizedRefCount&&) = delete;
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StabilizedRefCount& operator=(const StabilizedRefCount&) = delete;
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StabilizedRefCount& operator=(StabilizedRefCount&&) = delete;
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private:
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RefCntT& mRefCnt;
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};
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} // namespace mscom
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} // namespace mozilla
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#endif // mozilla_mscom_Aggregation_h
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