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/*
* Copyright (C) 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
* Copyright (C) 2008 Collabora Ltd.
* Copyright (C) 2009 Martin Robinson
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef WTF_GRefPtr_h
#define WTF_GRefPtr_h
#if USE(GLIB)
#include <wtf/GetPtr.h>
#include <wtf/RefPtr.h>
#include <algorithm>
extern "C" void g_object_unref(gpointer);
extern "C" gpointer g_object_ref_sink(gpointer);
namespace WTF {
enum GRefPtrAdoptType { GRefPtrAdopt };
template <typename T> inline T* refGPtr(T*);
template <typename T> inline void derefGPtr(T*);
template <typename T> class GRefPtr;
template <typename T> GRefPtr<T> adoptGRef(T*);
template <typename T> class GRefPtr {
public:
typedef T ValueType;
typedef ValueType* PtrType;
GRefPtr() : m_ptr(0) { }
GRefPtr(T* ptr)
: m_ptr(ptr)
{
if (ptr)
refGPtr(ptr);
}
GRefPtr(const GRefPtr& o)
: m_ptr(o.m_ptr)
{
if (T* ptr = m_ptr)
refGPtr(ptr);
}
template <typename U> GRefPtr(const GRefPtr<U>& o)
: m_ptr(o.get())
{
if (T* ptr = m_ptr)
refGPtr(ptr);
}
GRefPtr(GRefPtr&& o) : m_ptr(o.leakRef()) { }
template <typename U> GRefPtr(GRefPtr<U>&& o) : m_ptr(o.leakRef()) { }
~GRefPtr()
{
if (T* ptr = m_ptr)
derefGPtr(ptr);
}
void clear()
{
T* ptr = m_ptr;
m_ptr = 0;
if (ptr)
derefGPtr(ptr);
}
T* leakRef() WARN_UNUSED_RETURN
{
T* ptr = m_ptr;
m_ptr = 0;
return ptr;
}
T*& outPtr()
{
ASSERT(!m_ptr);
return m_ptr;
}
// Hash table deleted values, which are only constructed and never copied or destroyed.
GRefPtr(HashTableDeletedValueType) : m_ptr(hashTableDeletedValue()) { }
bool isHashTableDeletedValue() const { return m_ptr == hashTableDeletedValue(); }
T* get() const { return m_ptr; }
T& operator*() const { return *m_ptr; }
ALWAYS_INLINE T* operator->() const { return m_ptr; }
bool operator!() const { return !m_ptr; }
// This conversion operator allows implicit conversion to bool but not to other integer types.
typedef T* GRefPtr::*UnspecifiedBoolType;
operator UnspecifiedBoolType() const { return m_ptr ? &GRefPtr::m_ptr : 0; }
GRefPtr& operator=(const GRefPtr&);
GRefPtr& operator=(GRefPtr&&);
GRefPtr& operator=(T*);
template <typename U> GRefPtr& operator=(const GRefPtr<U>&);
void swap(GRefPtr&);
friend GRefPtr adoptGRef<T>(T*);
private:
static T* hashTableDeletedValue() { return reinterpret_cast<T*>(-1); }
// Adopting constructor.
GRefPtr(T* ptr, GRefPtrAdoptType) : m_ptr(ptr) {}
T* m_ptr;
};
template <typename T> inline GRefPtr<T>& GRefPtr<T>::operator=(const GRefPtr<T>& o)
{
T* optr = o.get();
if (optr)
refGPtr(optr);
T* ptr = m_ptr;
m_ptr = optr;
if (ptr)
derefGPtr(ptr);
return *this;
}
template <typename T> inline GRefPtr<T>& GRefPtr<T>::operator=(GRefPtr<T>&& o)
{
GRefPtr ptr = WTFMove(o);
swap(ptr);
return *this;
}
template <typename T> inline GRefPtr<T>& GRefPtr<T>::operator=(T* optr)
{
T* ptr = m_ptr;
if (optr)
refGPtr(optr);
m_ptr = optr;
if (ptr)
derefGPtr(ptr);
return *this;
}
template <class T> inline void GRefPtr<T>::swap(GRefPtr<T>& o)
{
std::swap(m_ptr, o.m_ptr);
}
template <class T> inline void swap(GRefPtr<T>& a, GRefPtr<T>& b)
{
a.swap(b);
}
template <typename T, typename U> inline bool operator==(const GRefPtr<T>& a, const GRefPtr<U>& b)
{
return a.get() == b.get();
}
template <typename T, typename U> inline bool operator==(const GRefPtr<T>& a, U* b)
{
return a.get() == b;
}
template <typename T, typename U> inline bool operator==(T* a, const GRefPtr<U>& b)
{
return a == b.get();
}
template <typename T, typename U> inline bool operator!=(const GRefPtr<T>& a, const GRefPtr<U>& b)
{
return a.get() != b.get();
}
template <typename T, typename U> inline bool operator!=(const GRefPtr<T>& a, U* b)
{
return a.get() != b;
}
template <typename T, typename U> inline bool operator!=(T* a, const GRefPtr<U>& b)
{
return a != b.get();
}
template <typename T, typename U> inline GRefPtr<T> static_pointer_cast(const GRefPtr<U>& p)
{
return GRefPtr<T>(static_cast<T*>(p.get()));
}
template <typename T, typename U> inline GRefPtr<T> const_pointer_cast(const GRefPtr<U>& p)
{
return GRefPtr<T>(const_cast<T*>(p.get()));
}
template <typename T> struct IsSmartPtr<GRefPtr<T>> {
static const bool value = true;
};
template <typename T> GRefPtr<T> adoptGRef(T* p)
{
return GRefPtr<T>(p, GRefPtrAdopt);
}
template <> WTF_EXPORT_PRIVATE GHashTable* refGPtr(GHashTable* ptr);
template <> WTF_EXPORT_PRIVATE void derefGPtr(GHashTable* ptr);
template <> WTF_EXPORT_PRIVATE GMainContext* refGPtr(GMainContext* ptr);
template <> WTF_EXPORT_PRIVATE void derefGPtr(GMainContext* ptr);
template <> WTF_EXPORT_PRIVATE GMainLoop* refGPtr(GMainLoop* ptr);
template <> WTF_EXPORT_PRIVATE void derefGPtr(GMainLoop* ptr);
template <> WTF_EXPORT_PRIVATE GVariant* refGPtr(GVariant* ptr);
template <> WTF_EXPORT_PRIVATE void derefGPtr(GVariant* ptr);
template <> WTF_EXPORT_PRIVATE GVariantBuilder* refGPtr(GVariantBuilder* ptr);
template <> WTF_EXPORT_PRIVATE void derefGPtr(GVariantBuilder* ptr);
template <> WTF_EXPORT_PRIVATE GSource* refGPtr(GSource* ptr);
template <> WTF_EXPORT_PRIVATE void derefGPtr(GSource* ptr);
template <> WTF_EXPORT_PRIVATE GPtrArray* refGPtr(GPtrArray*);
template <> WTF_EXPORT_PRIVATE void derefGPtr(GPtrArray*);
template <> WTF_EXPORT_PRIVATE GByteArray* refGPtr(GByteArray*);
template <> WTF_EXPORT_PRIVATE void derefGPtr(GByteArray*);
template <> WTF_EXPORT_PRIVATE GBytes* refGPtr(GBytes*);
template <> WTF_EXPORT_PRIVATE void derefGPtr(GBytes*);
template <> WTF_EXPORT_PRIVATE GClosure* refGPtr(GClosure*);
template <> WTF_EXPORT_PRIVATE void derefGPtr(GClosure*);
template <typename T> inline T* refGPtr(T* ptr)
{
if (ptr)
g_object_ref_sink(ptr);
return ptr;
}
template <typename T> inline void derefGPtr(T* ptr)
{
if (ptr)
g_object_unref(ptr);
}
} // namespace WTF
using WTF::GRefPtr;
using WTF::adoptGRef;
#endif // USE(GLIB)
#endif // WTF_GRefPtr_h
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