Revert "Remove support for MSVC"

sky/engine/wtf/OwnPtr.h

 /*
  *  Copyright (C) 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *  Copyright (C) 2013 Intel Corporation. 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,
@@ skipping 15 matching lines @@
 #include "wtf/Noncopyable.h"
 #include "wtf/NullPtr.h"
 #include "wtf/OwnPtrCommon.h"
 #include <algorithm>
 
 namespace WTF {
 
     template<typename T> class PassOwnPtr;
 
     template<typename T> class OwnPtr {
+#if COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES)
         // If rvalue references are not supported, the copy constructor is
         // public so OwnPtr cannot be marked noncopyable. See note below.
         WTF_MAKE_NONCOPYABLE(OwnPtr);
+#endif
         WTF_DISALLOW_CONSTRUCTION_FROM_ZERO(OwnPtr);
     public:
         typedef typename RemoveExtent<T>::Type ValueType;
         typedef ValueType* PtrType;
 
         OwnPtr() : m_ptr(0) { }
         OwnPtr(std::nullptr_t) : m_ptr(0) { }
 
         // See comment in PassOwnPtr.h for why this takes a const reference.
         OwnPtr(const PassOwnPtr<T>&);
         template<typename U> OwnPtr(const PassOwnPtr<U>&, EnsurePtrConvertibleArgDecl(U, T));
 
         // Hash table deleted values, which are only constructed and never copied or destroyed.
         OwnPtr(HashTableDeletedValueType) : m_ptr(hashTableDeletedValue()) { }
         bool isHashTableDeletedValue() const { return m_ptr == hashTableDeletedValue(); }
 
+#if !COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES)
+        // This copy constructor is used implicitly by gcc when it generates
+        // transients for assigning a PassOwnPtr<T> object to a stack-allocated
+        // OwnPtr<T> object. It should never be called explicitly and gcc
+        // should optimize away the constructor when generating code.
+        OwnPtr(const OwnPtr&);
+#endif
+
         ~OwnPtr()
         {
             OwnedPtrDeleter<T>::deletePtr(m_ptr);
             m_ptr = 0;
         }
 
         PtrType get() const { return m_ptr; }
 
         void clear();
         PassOwnPtr<T> release();
         PtrType leakPtr() WARN_UNUSED_RETURN;
 
         ValueType& operator*() const { ASSERT(m_ptr); return *m_ptr; }
         PtrType operator->() const { ASSERT(m_ptr); return m_ptr; }
 
         ValueType& operator[](std::ptrdiff_t i) const;
 
         bool operator!() const { return !m_ptr; }
 
         // This conversion operator allows implicit conversion to bool but not to other integer types.
         typedef PtrType OwnPtr::*UnspecifiedBoolType;
         operator UnspecifiedBoolType() const { return m_ptr ? &OwnPtr::m_ptr : 0; }
 
         OwnPtr& operator=(const PassOwnPtr<T>&);
         OwnPtr& operator=(std::nullptr_t) { clear(); return *this; }
         template<typename U> OwnPtr& operator=(const PassOwnPtr<U>&);
 
+#if COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES)
         OwnPtr(OwnPtr&&);
         template<typename U> OwnPtr(OwnPtr<U>&&);
 
         OwnPtr& operator=(OwnPtr&&);
         template<typename U> OwnPtr& operator=(OwnPtr<U>&&);
+#endif
 
         void swap(OwnPtr& o) { std::swap(m_ptr, o.m_ptr); }
 
         static T* hashTableDeletedValue() { return reinterpret_cast<T*>(-1); }
 
     private:
+#if !COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES)
+        // If rvalue references are supported, noncopyable takes care of this.
+        OwnPtr& operator=(const OwnPtr&);
+#endif
+
         // We should never have two OwnPtrs for the same underlying object (otherwise we'll get
         // double-destruction), so these equality operators should never be needed.
         template<typename U> bool operator==(const OwnPtr<U>&) const { COMPILE_ASSERT(!sizeof(U*), OwnPtrs_should_never_be_equal); return false; }
         template<typename U> bool operator!=(const OwnPtr<U>&) const { COMPILE_ASSERT(!sizeof(U*), OwnPtrs_should_never_be_equal); return false; }
         template<typename U> bool operator==(const PassOwnPtr<U>&) const { COMPILE_ASSERT(!sizeof(U*), OwnPtrs_should_never_be_equal); return false; }
         template<typename U> bool operator!=(const PassOwnPtr<U>&) const { COMPILE_ASSERT(!sizeof(U*), OwnPtrs_should_never_be_equal); return false; }
 
         PtrType m_ptr;
     };
 
@@ skipping 49 matching lines @@
     template<typename T> template<typename U> inline OwnPtr<T>& OwnPtr<T>::operator=(const PassOwnPtr<U>& o)
     {
         COMPILE_ASSERT(!IsArray<T>::value, Pointers_to_array_must_never_be_converted);
         PtrType ptr = m_ptr;
         m_ptr = o.leakPtr();
         ASSERT(!ptr || m_ptr != ptr);
         OwnedPtrDeleter<T>::deletePtr(ptr);
         return *this;
     }
 
+#if COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES)
     template<typename T> inline OwnPtr<T>::OwnPtr(OwnPtr<T>&& o)
         : m_ptr(o.leakPtr())
     {
     }
 
     template<typename T> template<typename U> inline OwnPtr<T>::OwnPtr(OwnPtr<U>&& o)
         : m_ptr(o.leakPtr())
     {
         COMPILE_ASSERT(!IsArray<T>::value, Pointers_to_array_must_never_be_converted);
     }
@@ skipping 11 matching lines @@
     template<typename T> template<typename U> inline OwnPtr<T>& OwnPtr<T>::operator=(OwnPtr<U>&& o)
     {
         COMPILE_ASSERT(!IsArray<T>::value, Pointers_to_array_must_never_be_converted);
         PtrType ptr = m_ptr;
         m_ptr = o.leakPtr();
         ASSERT(!ptr || m_ptr != ptr);
         OwnedPtrDeleter<T>::deletePtr(ptr);
 
         return *this;
     }
+#endif
 
     template<typename T> inline void swap(OwnPtr<T>& a, OwnPtr<T>& b)
     {
         a.swap(b);
     }
 
     template<typename T, typename U> inline bool operator==(const OwnPtr<T>& a, U* b)
     {
         return a.get() == b;
     }
@@ skipping 16 matching lines @@
     template<typename T> inline typename OwnPtr<T>::PtrType getPtr(const OwnPtr<T>& p)
     {
         return p.get();
     }
 
 } // namespace WTF
 
 using WTF::OwnPtr;
 
 #endif // WTF_OwnPtr_h