Revert "Remove support for MSVC"

sky/engine/wtf/RetainPtr.h

Index: sky/engine/wtf/RetainPtr.h
diff --git a/sky/engine/wtf/RetainPtr.h b/sky/engine/wtf/RetainPtr.h
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+++ b/sky/engine/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 "wtf/HashTableDeletedValueType.h"
+#include "wtf/HashTraits.h"
+#include "wtf/NullPtr.h"
+#include "wtf/TypeTraits.h"
+#include <algorithm>
+
+#if USE(CF)
+#include <CoreFoundation/CoreFoundation.h>
+#endif
+
+#ifdef __OBJC__
+#import <Foundation/Foundation.h>
+#endif
+
+#ifndef CF_RELEASES_ARGUMENT
+#define CF_RELEASES_ARGUMENT
+#endif
+
+#ifndef NS_RELEASES_ARGUMENT
+#define NS_RELEASES_ARGUMENT
+#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); }
+
+#if COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES)
+        RetainPtr(RetainPtr&& o) : m_ptr(o.leakRef()) { }
+#endif
+
+        // 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>&);
+
+        void clear();
+        PtrType leakRef() WARN_UNUSED_RETURN;
+
+        PtrType get() const { return m_ptr; }
+        PtrType operator->() const { return m_ptr; }
+#if COMPILER_SUPPORTS(CXX_EXPLICIT_CONVERSIONS)
+        explicit operator PtrType() const { return m_ptr; }
+#endif
+
+        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*);
+
+#if COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES)
+        RetainPtr& operator=(RetainPtr&&);
+        template<typename U> RetainPtr& operator=(RetainPtr<U>&&);
+#endif
+
+#if !COMPILER_SUPPORTS(CXX_NULLPTR)
+        RetainPtr& operator=(std::nullptr_t) { clear(); return *this; }
+#endif
+
+        void adoptCF(PtrType);
+        void adoptNS(PtrType);
+
+        void swap(RetainPtr&);
+
+    private:
+        static PtrType hashTableDeletedValue() { return reinterpret_cast<PtrType>(-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> 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;
+    }
+
+#if COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES)
+    template<typename T> inline RetainPtr<T>& RetainPtr<T>::operator=(RetainPtr<T>&& o)
+    {
+        adoptCF(o.leakRef());
+        return *this;
+    }
+
+    template<typename T> template<typename U> inline RetainPtr<T>& RetainPtr<T>::operator=(RetainPtr<U>&& o)
+    {
+        adoptCF(o.leakRef());
+        return *this;
+    }
+#endif
+
+    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> 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 T> inline RetainPtr<T> adoptCF(T CF_RELEASES_ARGUMENT) WARN_UNUSED_RETURN;
+    template<typename T> inline RetainPtr<T> adoptCF(T o)
+    {
+        return RetainPtr<T>(AdoptCF, o);
+    }
+
+    template<typename T> inline RetainPtr<T> adoptNS(T NS_RELEASES_ARGUMENT) WARN_UNUSED_RETURN;
+    template<typename T> inline RetainPtr<T> adoptNS(T o)
+    {
+        return RetainPtr<T>(AdoptNS, o);
+    }
+
+    // Helper function for creating a RetainPtr using template argument deduction.
+    template<typename T> inline RetainPtr<T> retainPtr(T) WARN_UNUSED_RETURN;
+    template<typename T> inline RetainPtr<T> retainPtr(T o)
+    {
+        return RetainPtr<T>(o);
+    }
+
+    template<typename P> struct HashTraits<RetainPtr<P> > : SimpleClassHashTraits<RetainPtr<P> > { };
+
+    template<typename P> struct PtrHash<RetainPtr<P> > : PtrHash<typename RetainPtr<P>::PtrType> {
+        using PtrHash<typename RetainPtr<P>::PtrType>::hash;
+        static unsigned hash(const RetainPtr<P>& key) { return hash(key.get()); }
+        using PtrHash<typename RetainPtr<P>::PtrType>::equal;
+        static bool equal(const RetainPtr<P>& a, const RetainPtr<P>& b) { return a == b; }
+        static bool equal(typename RetainPtr<P>::PtrType a, const RetainPtr<P>& b) { return a == b; }
+        static bool equal(const RetainPtr<P>& a, typename RetainPtr<P>::PtrType 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::adoptCF;
+using WTF::adoptNS;
+using WTF::RetainPtr;
+using WTF::retainPtr;
+
+#endif // WTF_RetainPtr_h