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-rw-r--r--JavaScriptCore/wtf/RetainPtr.h255
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diff --git a/JavaScriptCore/wtf/RetainPtr.h b/JavaScriptCore/wtf/RetainPtr.h
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-/*
- * Copyright (C) 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
- *
- * 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 RetainPtr_h
-#define RetainPtr_h
-
-#include "HashTraits.h"
-#include "NullPtr.h"
-#include "TypeTraits.h"
-#include <algorithm>
-#include <CoreFoundation/CoreFoundation.h>
-
-#ifdef __OBJC__
-#import <Foundation/Foundation.h>
-#endif
-
-namespace WTF {
-
- // Unlike most most of our smart pointers, RetainPtr can take either the pointer type or the pointed-to type,
- // so both RetainPtr<NSDictionary> and RetainPtr<CFDictionaryRef> will work.
-
- enum AdoptCFTag { AdoptCF };
- enum AdoptNSTag { AdoptNS };
-
-#ifdef __OBJC__
- inline void adoptNSReference(id ptr)
- {
- if (ptr) {
- CFRetain(ptr);
- [ptr release];
- }
- }
-#endif
-
- template<typename T> class RetainPtr {
- public:
- typedef typename RemovePointer<T>::Type ValueType;
- typedef ValueType* PtrType;
-
- RetainPtr() : m_ptr(0) {}
- RetainPtr(PtrType ptr) : m_ptr(ptr) { if (ptr) CFRetain(ptr); }
-
- RetainPtr(AdoptCFTag, PtrType ptr) : m_ptr(ptr) { }
- RetainPtr(AdoptNSTag, PtrType ptr) : m_ptr(ptr) { adoptNSReference(ptr); }
-
- RetainPtr(const RetainPtr& o) : m_ptr(o.m_ptr) { if (PtrType ptr = m_ptr) CFRetain(ptr); }
-
- // Hash table deleted values, which are only constructed and never copied or destroyed.
- RetainPtr(HashTableDeletedValueType) : m_ptr(hashTableDeletedValue()) { }
- bool isHashTableDeletedValue() const { return m_ptr == hashTableDeletedValue(); }
-
- ~RetainPtr() { if (PtrType ptr = m_ptr) CFRelease(ptr); }
-
- template<typename U> RetainPtr(const RetainPtr<U>&);
-
- PtrType get() const { return m_ptr; }
-
- void clear();
- PtrType leakRef() WARN_UNUSED_RETURN;
-
- PtrType 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 PtrType RetainPtr::*UnspecifiedBoolType;
- operator UnspecifiedBoolType() const { return m_ptr ? &RetainPtr::m_ptr : 0; }
-
- RetainPtr& operator=(const RetainPtr&);
- template<typename U> RetainPtr& operator=(const RetainPtr<U>&);
- RetainPtr& operator=(PtrType);
- template<typename U> RetainPtr& operator=(U*);
- RetainPtr& operator=(std::nullptr_t) { clear(); return *this; }
-
- void adoptCF(PtrType);
- void adoptNS(PtrType);
-
- void swap(RetainPtr&);
-
- // FIXME: Remove releaseRef once we change all callers to call leakRef instead.
- PtrType releaseRef() { return leakRef(); }
-
- private:
- static T* hashTableDeletedValue() { return reinterpret_cast<T*>(-1); }
-
- PtrType m_ptr;
- };
-
- template<typename T> template<typename U> inline RetainPtr<T>::RetainPtr(const RetainPtr<U>& o)
- : m_ptr(o.get())
- {
- if (PtrType ptr = m_ptr)
- CFRetain(ptr);
- }
-
- template<typename T> inline void RetainPtr<T>::clear()
- {
- if (PtrType ptr = m_ptr) {
- m_ptr = 0;
- CFRelease(ptr);
- }
- }
-
- template<typename T> inline typename RetainPtr<T>::PtrType RetainPtr<T>::leakRef()
- {
- PtrType ptr = m_ptr;
- m_ptr = 0;
- return ptr;
- }
-
- template<typename T> inline RetainPtr<T>& RetainPtr<T>::operator=(const RetainPtr<T>& o)
- {
- PtrType optr = o.get();
- if (optr)
- CFRetain(optr);
- PtrType ptr = m_ptr;
- m_ptr = optr;
- if (ptr)
- CFRelease(ptr);
- return *this;
- }
-
- template<typename T> template<typename U> inline RetainPtr<T>& RetainPtr<T>::operator=(const RetainPtr<U>& o)
- {
- PtrType optr = o.get();
- if (optr)
- CFRetain(optr);
- PtrType ptr = m_ptr;
- m_ptr = optr;
- if (ptr)
- CFRelease(ptr);
- return *this;
- }
-
- template<typename T> inline RetainPtr<T>& RetainPtr<T>::operator=(PtrType optr)
- {
- if (optr)
- CFRetain(optr);
- PtrType ptr = m_ptr;
- m_ptr = optr;
- if (ptr)
- CFRelease(ptr);
- return *this;
- }
-
- template<typename T> inline void RetainPtr<T>::adoptCF(PtrType optr)
- {
- PtrType ptr = m_ptr;
- m_ptr = optr;
- if (ptr)
- CFRelease(ptr);
- }
-
- template<typename T> inline void RetainPtr<T>::adoptNS(PtrType optr)
- {
- adoptNSReference(optr);
-
- PtrType ptr = m_ptr;
- m_ptr = optr;
- if (ptr)
- CFRelease(ptr);
- }
-
- template<typename T> template<typename U> inline RetainPtr<T>& RetainPtr<T>::operator=(U* optr)
- {
- if (optr)
- CFRetain(optr);
- PtrType ptr = m_ptr;
- m_ptr = optr;
- if (ptr)
- CFRelease(ptr);
- return *this;
- }
-
- template<typename T> inline void RetainPtr<T>::swap(RetainPtr<T>& o)
- {
- std::swap(m_ptr, o.m_ptr);
- }
-
- template<typename T> inline void swap(RetainPtr<T>& a, RetainPtr<T>& b)
- {
- a.swap(b);
- }
-
- template<typename T, typename U> inline bool operator==(const RetainPtr<T>& a, const RetainPtr<U>& b)
- {
- return a.get() == b.get();
- }
-
- template<typename T, typename U> inline bool operator==(const RetainPtr<T>& a, U* b)
- {
- return a.get() == b;
- }
-
- template<typename T, typename U> inline bool operator==(T* a, const RetainPtr<U>& b)
- {
- return a == b.get();
- }
-
- template<typename T, typename U> inline bool operator!=(const RetainPtr<T>& a, const RetainPtr<U>& b)
- {
- return a.get() != b.get();
- }
-
- template<typename T, typename U> inline bool operator!=(const RetainPtr<T>& a, U* b)
- {
- return a.get() != b;
- }
-
- template<typename T, typename U> inline bool operator!=(T* a, const RetainPtr<U>& b)
- {
- return a != b.get();
- }
-
- template<typename P> struct HashTraits<RetainPtr<P> > : GenericHashTraits<RetainPtr<P> > {
- static const bool emptyValueIsZero = true;
- static void constructDeletedValue(RetainPtr<P>& slot) { new (&slot) RetainPtr<P>(HashTableDeletedValue); }
- static bool isDeletedValue(const RetainPtr<P>& value) { return value == reinterpret_cast<P*>(-1); }
- };
-
- template<typename P> struct PtrHash<RetainPtr<P> > : PtrHash<P*> {
- using PtrHash<P*>::hash;
- static unsigned hash(const RetainPtr<P>& key) { return hash(key.get()); }
- using PtrHash<P*>::equal;
- static bool equal(const RetainPtr<P>& a, const RetainPtr<P>& b) { return a == b; }
- static bool equal(P* a, const RetainPtr<P>& b) { return a == b; }
- static bool equal(const RetainPtr<P>& a, P* b) { return a == b; }
- };
-
- template<typename P> struct DefaultHash<RetainPtr<P> > { typedef PtrHash<RetainPtr<P> > Hash; };
-
-} // namespace WTF
-
-using WTF::AdoptCF;
-using WTF::AdoptNS;
-using WTF::RetainPtr;
-
-#endif // WTF_RetainPtr_h
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