mirror of
https://github.com/flutter/flutter.git
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310 lines
9.1 KiB
Objective-C
310 lines
9.1 KiB
Objective-C
/*
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* Copyright (C) 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
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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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#ifndef RetainPtr_h
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#define RetainPtr_h
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#include "wtf/HashTableDeletedValueType.h"
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#include "wtf/HashTraits.h"
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#include "wtf/NullPtr.h"
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#include "wtf/TypeTraits.h"
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#include <algorithm>
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#if USE(CF)
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#include <CoreFoundation/CoreFoundation.h>
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#endif
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#ifdef __OBJC__
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#import <Foundation/Foundation.h>
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#endif
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#ifndef CF_RELEASES_ARGUMENT
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#define CF_RELEASES_ARGUMENT
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#endif
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#ifndef NS_RELEASES_ARGUMENT
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#define NS_RELEASES_ARGUMENT
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#endif
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namespace WTF {
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// Unlike most most of our smart pointers, RetainPtr can take either the pointer type or the pointed-to type,
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// so both RetainPtr<NSDictionary> and RetainPtr<CFDictionaryRef> will work.
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enum AdoptCFTag { AdoptCF };
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enum AdoptNSTag { AdoptNS };
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#ifdef __OBJC__
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inline void adoptNSReference(id ptr)
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{
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if (ptr) {
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CFRetain(ptr);
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[ptr release];
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}
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}
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#endif
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template<typename T> class RetainPtr {
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public:
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typedef typename RemovePointer<T>::Type ValueType;
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typedef ValueType* PtrType;
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RetainPtr() : m_ptr(0) {}
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RetainPtr(PtrType ptr) : m_ptr(ptr) { if (ptr) CFRetain(ptr); }
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RetainPtr(AdoptCFTag, PtrType ptr) : m_ptr(ptr) { }
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RetainPtr(AdoptNSTag, PtrType ptr) : m_ptr(ptr) { adoptNSReference(ptr); }
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RetainPtr(const RetainPtr& o) : m_ptr(o.m_ptr) { if (PtrType ptr = m_ptr) CFRetain(ptr); }
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#if COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES)
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RetainPtr(RetainPtr&& o) : m_ptr(o.leakRef()) { }
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#endif
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// Hash table deleted values, which are only constructed and never copied or destroyed.
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RetainPtr(HashTableDeletedValueType) : m_ptr(hashTableDeletedValue()) { }
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bool isHashTableDeletedValue() const { return m_ptr == hashTableDeletedValue(); }
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~RetainPtr() { if (PtrType ptr = m_ptr) CFRelease(ptr); }
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template<typename U> RetainPtr(const RetainPtr<U>&);
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void clear();
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PtrType leakRef() WARN_UNUSED_RETURN;
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PtrType get() const { return m_ptr; }
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PtrType operator->() const { return m_ptr; }
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#if COMPILER_SUPPORTS(CXX_EXPLICIT_CONVERSIONS)
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explicit operator PtrType() const { return m_ptr; }
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#endif
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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 PtrType RetainPtr::*UnspecifiedBoolType;
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operator UnspecifiedBoolType() const { return m_ptr ? &RetainPtr::m_ptr : 0; }
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RetainPtr& operator=(const RetainPtr&);
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template<typename U> RetainPtr& operator=(const RetainPtr<U>&);
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RetainPtr& operator=(PtrType);
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template<typename U> RetainPtr& operator=(U*);
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#if COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES)
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RetainPtr& operator=(RetainPtr&&);
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template<typename U> RetainPtr& operator=(RetainPtr<U>&&);
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#endif
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#if !COMPILER_SUPPORTS(CXX_NULLPTR)
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RetainPtr& operator=(std::nullptr_t) { clear(); return *this; }
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#endif
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void adoptCF(PtrType);
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void adoptNS(PtrType);
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void swap(RetainPtr&);
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private:
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static PtrType hashTableDeletedValue() { return reinterpret_cast<PtrType>(-1); }
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PtrType m_ptr;
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};
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template<typename T> template<typename U> inline RetainPtr<T>::RetainPtr(const RetainPtr<U>& o)
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: m_ptr(o.get())
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{
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if (PtrType ptr = m_ptr)
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CFRetain(ptr);
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}
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template<typename T> inline void RetainPtr<T>::clear()
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{
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if (PtrType ptr = m_ptr) {
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m_ptr = 0;
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CFRelease(ptr);
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}
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}
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template<typename T> inline typename RetainPtr<T>::PtrType RetainPtr<T>::leakRef()
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{
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PtrType ptr = m_ptr;
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m_ptr = 0;
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return ptr;
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}
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template<typename T> inline RetainPtr<T>& RetainPtr<T>::operator=(const RetainPtr<T>& o)
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{
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PtrType optr = o.get();
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if (optr)
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CFRetain(optr);
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PtrType ptr = m_ptr;
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m_ptr = optr;
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if (ptr)
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CFRelease(ptr);
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return *this;
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}
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template<typename T> template<typename U> inline RetainPtr<T>& RetainPtr<T>::operator=(const RetainPtr<U>& o)
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{
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PtrType optr = o.get();
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if (optr)
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CFRetain(optr);
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PtrType ptr = m_ptr;
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m_ptr = optr;
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if (ptr)
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CFRelease(ptr);
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return *this;
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}
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template<typename T> inline RetainPtr<T>& RetainPtr<T>::operator=(PtrType optr)
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{
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if (optr)
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CFRetain(optr);
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PtrType ptr = m_ptr;
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m_ptr = optr;
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if (ptr)
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CFRelease(ptr);
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return *this;
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}
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template<typename T> template<typename U> inline RetainPtr<T>& RetainPtr<T>::operator=(U* optr)
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{
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if (optr)
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CFRetain(optr);
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PtrType ptr = m_ptr;
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m_ptr = optr;
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if (ptr)
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CFRelease(ptr);
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return *this;
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}
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#if COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES)
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template<typename T> inline RetainPtr<T>& RetainPtr<T>::operator=(RetainPtr<T>&& o)
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{
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adoptCF(o.leakRef());
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return *this;
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}
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template<typename T> template<typename U> inline RetainPtr<T>& RetainPtr<T>::operator=(RetainPtr<U>&& o)
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{
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adoptCF(o.leakRef());
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return *this;
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}
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#endif
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template<typename T> inline void RetainPtr<T>::adoptCF(PtrType optr)
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{
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PtrType ptr = m_ptr;
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m_ptr = optr;
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if (ptr)
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CFRelease(ptr);
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}
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template<typename T> inline void RetainPtr<T>::adoptNS(PtrType optr)
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{
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adoptNSReference(optr);
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PtrType ptr = m_ptr;
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m_ptr = optr;
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if (ptr)
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CFRelease(ptr);
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}
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template<typename T> inline void RetainPtr<T>::swap(RetainPtr<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<typename T> inline void swap(RetainPtr<T>& a, RetainPtr<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 RetainPtr<T>& a, const RetainPtr<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 RetainPtr<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 RetainPtr<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 RetainPtr<T>& a, const RetainPtr<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 RetainPtr<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 RetainPtr<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> inline RetainPtr<T> adoptCF(T CF_RELEASES_ARGUMENT) WARN_UNUSED_RETURN;
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template<typename T> inline RetainPtr<T> adoptCF(T o)
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{
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return RetainPtr<T>(AdoptCF, o);
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}
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template<typename T> inline RetainPtr<T> adoptNS(T NS_RELEASES_ARGUMENT) WARN_UNUSED_RETURN;
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template<typename T> inline RetainPtr<T> adoptNS(T o)
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{
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return RetainPtr<T>(AdoptNS, o);
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}
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// Helper function for creating a RetainPtr using template argument deduction.
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template<typename T> inline RetainPtr<T> retainPtr(T) WARN_UNUSED_RETURN;
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template<typename T> inline RetainPtr<T> retainPtr(T o)
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{
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return RetainPtr<T>(o);
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}
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template<typename P> struct HashTraits<RetainPtr<P> > : SimpleClassHashTraits<RetainPtr<P> > { };
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template<typename P> struct PtrHash<RetainPtr<P> > : PtrHash<typename RetainPtr<P>::PtrType> {
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using PtrHash<typename RetainPtr<P>::PtrType>::hash;
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static unsigned hash(const RetainPtr<P>& key) { return hash(key.get()); }
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using PtrHash<typename RetainPtr<P>::PtrType>::equal;
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static bool equal(const RetainPtr<P>& a, const RetainPtr<P>& b) { return a == b; }
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static bool equal(typename RetainPtr<P>::PtrType a, const RetainPtr<P>& b) { return a == b; }
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static bool equal(const RetainPtr<P>& a, typename RetainPtr<P>::PtrType b) { return a == b; }
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};
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template<typename P> struct DefaultHash<RetainPtr<P> > { typedef PtrHash<RetainPtr<P> > Hash; };
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} // namespace WTF
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using WTF::AdoptCF;
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using WTF::AdoptNS;
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using WTF::adoptCF;
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using WTF::adoptNS;
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using WTF::RetainPtr;
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using WTF::retainPtr;
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#endif // WTF_RetainPtr_h
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