mirror of
https://github.com/flutter/flutter.git
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117 lines
3.9 KiB
C++
117 lines
3.9 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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#ifndef ResourcePtr_h
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#define ResourcePtr_h
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#include "core/fetch/Resource.h"
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namespace blink {
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class ResourcePtrBase {
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public:
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~ResourcePtrBase();
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Resource* get() const { return m_resource; }
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bool operator!() const { return !m_resource; }
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void clear() { setResource(0); }
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// This conversion operator allows implicit conversion to bool but not to other integer types.
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typedef Resource* ResourcePtrBase::*UnspecifiedBoolType;
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operator UnspecifiedBoolType() const { return m_resource ? &ResourcePtrBase::m_resource : 0; }
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protected:
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ResourcePtrBase() : m_resource(0) { }
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ResourcePtrBase(Resource*);
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ResourcePtrBase(const ResourcePtrBase&);
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void setResource(Resource*);
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private:
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ResourcePtrBase& operator=(const ResourcePtrBase&) { return *this; }
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friend class Resource;
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Resource* m_resource;
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};
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inline ResourcePtrBase::ResourcePtrBase(Resource* res)
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: m_resource(res)
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{
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if (m_resource)
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m_resource->registerHandle(this);
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}
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inline ResourcePtrBase::~ResourcePtrBase()
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{
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if (m_resource)
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m_resource->unregisterHandle(this);
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}
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inline ResourcePtrBase::ResourcePtrBase(const ResourcePtrBase& o)
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: m_resource(o.m_resource)
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{
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if (m_resource)
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m_resource->registerHandle(this);
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}
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template <class R> class ResourcePtr : public ResourcePtrBase {
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public:
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ResourcePtr() { }
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ResourcePtr(R* res) : ResourcePtrBase(res) { }
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ResourcePtr(const ResourcePtr<R>& o) : ResourcePtrBase(o) { }
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template<typename U> ResourcePtr(const ResourcePtr<U>& o) : ResourcePtrBase(o.get()) { }
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R* get() const { return reinterpret_cast<R*>(ResourcePtrBase::get()); }
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R* operator->() const { return get(); }
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ResourcePtr& operator=(R* res) { setResource(res); return *this; }
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ResourcePtr& operator=(const ResourcePtr& o) { setResource(o.get()); return *this; }
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template<typename U> ResourcePtr& operator=(const ResourcePtr<U>& o) { setResource(o.get()); return *this; }
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bool operator==(const ResourcePtrBase& o) const { return get() == o.get(); }
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bool operator!=(const ResourcePtrBase& o) const { return get() != o.get(); }
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};
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template <class R, class RR> bool operator==(const ResourcePtr<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 ResourcePtr<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 ResourcePtr<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 ResourcePtr<R>& h)
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{
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return h.get() != res;
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}
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}
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#endif
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