Add move constructor and assignment operator to RefPtr class

Source/wtf/RefPtr.h

 /*
  *  Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2013 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
@@ skipping 26 matching lines @@
         WTF_DISALLOW_ZERO_ASSIGNMENT(RefPtr);
     public:
         ALWAYS_INLINE RefPtr() : m_ptr(0) { }
         ALWAYS_INLINE RefPtr(std::nullptr_t) : m_ptr(0) { }
         ALWAYS_INLINE RefPtr(T* ptr) : m_ptr(ptr) { refIfNotNull(ptr); }
         template<typename U> RefPtr(const RawPtr<U>& ptr, EnsurePtrConvertibleArgDecl(U, T)) : m_ptr(ptr.get()) { refIfNotNull(m_ptr); }
         ALWAYS_INLINE explicit RefPtr(T& ref) : m_ptr(&ref) { m_ptr->ref(); }
         ALWAYS_INLINE RefPtr(const RefPtr& o) : m_ptr(o.m_ptr) { refIfNotNull(m_ptr); }
         template<typename U> RefPtr(const RefPtr<U>& o, EnsurePtrConvertibleArgDecl(U, T)) : m_ptr(o.get()) { refIfNotNull(m_ptr); }
 
+#if COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES)
+        RefPtr(RefPtr&& o) : m_ptr(o.m_ptr) { o.m_ptr = 0; }
+        RefPtr& operator=(RefPtr&&);
+#endif
+
         // See comments in PassRefPtr.h for an explanation of why this takes a const reference.
         template<typename U> RefPtr(const PassRefPtr<U>&, EnsurePtrConvertibleArgDecl(U, T));
 
         // Hash table deleted values, which are only constructed and never copied or destroyed.
         RefPtr(HashTableDeletedValueType) : m_ptr(hashTableDeletedValue()) { }
         bool isHashTableDeletedValue() const { return m_ptr == hashTableDeletedValue(); }
 
         ALWAYS_INLINE ~RefPtr() { derefIfNotNull(m_ptr); }
 
         ALWAYS_INLINE T* get() const { return m_ptr; }
@@ skipping 39 matching lines @@
         derefIfNotNull(ptr);
     }
 
     template<typename T> inline RefPtr<T>& RefPtr<T>::operator=(const RefPtr& o)
     {
         RefPtr ptr = o;
         swap(ptr);
         return *this;
     }
 
+#if COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES)
+    template<typename T> inline RefPtr<T>& RefPtr<T>::operator=(RefPtr&& o)
+    {
+        swap(o);

[Mikhail, 2014/06/27 07:48:44]

This does not look correct, look
{
RefPtr<A> a = adoptRef(new A); // First object.
RefPtr<A> b = adoptRef(new A); // Second object.
a = std::move(b);
// We anticipate that the first object has gone but it's not the case
}

We need to have a temporary here.
Pls have a look at https://codereview.chromium.org/14031031

+        return *this;
+    }
+#endif
+
     template<typename T> template<typename U> inline RefPtr<T>& RefPtr<T>::operator=(const RefPtr<U>& o)
     {
         RefPtr ptr = o;
         swap(ptr);
         return *this;
     }
 
     template<typename T> inline RefPtr<T>& RefPtr<T>::operator=(T* optr)
     {
         RefPtr ptr = optr;
@@ skipping 83 matching lines @@
     private:
         T* m_ptr;
     };
 
 } // namespace WTF
 
 using WTF::RefPtr;
 using WTF::static_pointer_cast;
 
 #endif // WTF_RefPtr_h