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