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