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Diffstat (limited to 'Source/JavaScriptCore/wtf/gobject/GRefPtr.h')
| -rw-r--r-- | Source/JavaScriptCore/wtf/gobject/GRefPtr.h | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/wtf/gobject/GRefPtr.h b/Source/JavaScriptCore/wtf/gobject/GRefPtr.h new file mode 100644 index 0000000..10ebf07 --- /dev/null +++ b/Source/JavaScriptCore/wtf/gobject/GRefPtr.h @@ -0,0 +1,229 @@ +/* + * 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 ENABLE(GLIB_SUPPORT) + +#include "AlwaysInline.h" +#include "GRefPtr.h" +#include "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: + 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() + { + 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; + } + + // 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=(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=(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> inline T* getPtr(const GRefPtr<T>& p) +{ + return p.get(); +} + +template <typename T> GRefPtr<T> adoptGRef(T* p) +{ + return GRefPtr<T>(p, GRefPtrAdopt); +} + +template <> GHashTable* refGPtr(GHashTable* ptr); +template <> void derefGPtr(GHashTable* ptr); +template <> GVariant* refGPtr(GVariant* ptr); +template <> void derefGPtr(GVariant* ptr); +template <> GSource* refGPtr(GSource* ptr); +template <> void derefGPtr(GSource* ptr); + +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 // ENABLE(GLIB_SUPPORT) + +#endif // WTF_GRefPtr_h |