HashTraits<RawPtr> uses 'nullptr'

Source/wtf/HashTraits.h

 /*
  * Copyright (C) 2005, 2006, 2007, 2008, 2011, 2012 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 173 matching lines @@
         typedef PassRefPtr<P> PassOutType;
         static PassOutType passOut(RefPtr<P>& value) { return value.release(); }
         static PassOutType passOut(std::nullptr_t) { return nullptr; }
 
         typedef P* PeekOutType;
         static PeekOutType peek(const RefPtr<P>& value) { return value.get(); }
         static PeekOutType peek(std::nullptr_t) { return 0; }
     };
 
     template<typename T> struct HashTraits<RawPtr<T> > : SimpleClassHashTraits<RawPtr<T> > {
+        typedef std::nullptr_t EmptyValueType;
+        static EmptyValueType emptyValue() { return nullptr; }
+
+        static const bool hasIsEmptyValueFunction = true;
+        static bool isEmptyValue(const RawPtr<T>& value) { return !value; }
+
         static const bool needsDestruction = false;
         typedef T* PeekInType;
         typedef T* PassInType;
         typedef RawPtr<T>* IteratorGetType;
         typedef const RawPtr<T>* IteratorConstGetType;
         typedef RawPtr<T>& IteratorReferenceType;
         typedef T* const IteratorConstReferenceType;
         static IteratorReferenceType getToReferenceConversion(IteratorGetType x) { return *x; }
         static IteratorConstReferenceType getToReferenceConstConversion(IteratorConstGetType x) { return x->get(); }
         typedef T* PeekOutType;
         typedef T* PassOutType;
 
         template<typename U>
         static void store(const U& value, RawPtr<T>& storage) { storage = value; }
 
         static PeekOutType peek(const RawPtr<T>& value) { return value; }
+        static PeekOutType peek(std::nullptr_t) { return 0; }
+
         static PassOutType passOut(const RawPtr<T>& value) { return value; }
+        static PassOutType passOut(std::nullptr_t) { return 0; }
     };
 
     template<> struct HashTraits<String> : SimpleClassHashTraits<String> {
         static const bool hasIsEmptyValueFunction = true;
         static bool isEmptyValue(const String&);
     };
 
     // This struct template is an implementation detail of the isHashTraitsEmptyValue function,
     // which selects either the emptyValue function or the isEmptyValue function to check for empty values.
     template<typename Traits, bool hasEmptyValueFunction> struct HashTraitsEmptyValueChecker;
@@ skipping 87 matching lines @@
     };
 
 } // namespace WTF
 
 using WTF::HashTraits;
 using WTF::PairHashTraits;
 using WTF::NullableHashTraits;
 using WTF::SimpleClassHashTraits;
 
 #endif // WTF_HashTraits_h