98 lines
3.8 KiB
C++
98 lines
3.8 KiB
C++
/*
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* Copyright (C) 2008 Apple Inc. All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <wtf/Forward.h>
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namespace WebCore {
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class CachedResource;
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class WEBCORE_EXPORT CachedResourceHandleBase {
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public:
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~CachedResourceHandleBase();
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CachedResource* get() const { return m_resource; }
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bool operator!() const { return !m_resource; }
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// This conversion operator allows implicit conversion to bool but not to other integer types.
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typedef CachedResource* CachedResourceHandleBase::*UnspecifiedBoolType;
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operator UnspecifiedBoolType() const { return m_resource ? &CachedResourceHandleBase::m_resource : 0; }
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protected:
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CachedResourceHandleBase();
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CachedResourceHandleBase(CachedResource*);
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CachedResourceHandleBase(const CachedResourceHandleBase&);
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void setResource(CachedResource*);
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private:
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CachedResourceHandleBase& operator=(const CachedResourceHandleBase&) { return *this; }
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friend class CachedResource;
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CachedResource* m_resource;
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};
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template <class R> class CachedResourceHandle : public CachedResourceHandleBase {
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public:
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CachedResourceHandle() { }
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CachedResourceHandle(R* res) : CachedResourceHandleBase(res) { }
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CachedResourceHandle(const CachedResourceHandle<R>& o) : CachedResourceHandleBase(o) { }
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template<typename U> CachedResourceHandle(const CachedResourceHandle<U>& o) : CachedResourceHandleBase(o.get()) { }
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R* get() const { return reinterpret_cast<R*>(CachedResourceHandleBase::get()); }
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R* operator->() const { return get(); }
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R& operator*() const { ASSERT(get()); return *get(); }
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CachedResourceHandle& operator=(R* res) { setResource(res); return *this; }
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CachedResourceHandle& operator=(const CachedResourceHandle& o) { setResource(o.get()); return *this; }
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template<typename U> CachedResourceHandle& operator=(const CachedResourceHandle<U>& o) { setResource(o.get()); return *this; }
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bool operator==(const CachedResourceHandleBase& o) const { return get() == o.get(); }
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bool operator!=(const CachedResourceHandleBase& o) const { return get() != o.get(); }
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};
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template <class R, class RR> bool operator==(const CachedResourceHandle<R>& h, const RR* res)
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{
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return h.get() == res;
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}
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template <class R, class RR> bool operator==(const RR* res, const CachedResourceHandle<R>& h)
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{
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return h.get() == res;
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}
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template <class R, class RR> bool operator!=(const CachedResourceHandle<R>& h, const RR* res)
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{
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return h.get() != res;
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}
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template <class R, class RR> bool operator!=(const RR* res, const CachedResourceHandle<R>& h)
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{
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return h.get() != res;
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}
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} // namespace WebCore
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