Add macros to define comparison operators to compare by reference or pointer interchangeably

Source/wtf/Assertions.h

 /*
  * Copyright (C) 2003, 2006, 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 344 matching lines @@
 #if ASSERT_DISABLED
 #define RELEASE_ASSERT(assertion) (UNLIKELY(!(assertion)) ? (IMMEDIATE_CRASH()) : (void)0)
 #define RELEASE_ASSERT_WITH_MESSAGE(assertion, ...) RELEASE_ASSERT(assertion)
 #define RELEASE_ASSERT_NOT_REACHED() IMMEDIATE_CRASH()
 #else
 #define RELEASE_ASSERT(assertion) ASSERT(assertion)
 #define RELEASE_ASSERT_WITH_MESSAGE(assertion, ...) ASSERT_WITH_MESSAGE(assertion, __VA_ARGS__)
 #define RELEASE_ASSERT_NOT_REACHED() ASSERT_NOT_REACHED()
 #endif
 
+/* DEFINE_COMPARISON_OPERATORS_WITH_REFERENCES */
+
+// Allow equality comparisons of Objects by reference or pointer, interchangeably.
+#define DEFINE_COMPARISON_OPERATORS_WITH_REFERENCES(thisType) \
+    inline bool operator==(const thisType& a, const thisType& b) { return &a == &b; } \
+    inline bool operator==(const thisType& a, const thisType* b) { return &a == b; } \
+    inline bool operator==(const thisType* a, const thisType& b) { return a == &b; } \
+    inline bool operator!=(const thisType& a, const thisType& b) { return !(a == b); } \
+    inline bool operator!=(const thisType& a, const thisType* b) { return !(a == b); } \
+    inline bool operator!=(const thisType* a, const thisType& b) { return !(a == b); }
+
+#define DEFINE_COMPARISON_OPERATORS_WITH_REFERENCES_REFCOUNTED(thisType) \
+    DEFINE_COMPARISON_OPERATORS_WITH_REFERENCES(thisType) \
+    inline bool operator==(const PassRefPtr<thisType>& a, const thisType& b) { return a.get() == &b; } \
+    inline bool operator==(const thisType& a, const PassRefPtr<thisType>& b) { return &a == b.get(); } \
+    inline bool operator!=(const PassRefPtr<thisType>& a, const thisType& b) { return !(a == b); } \
+    inline bool operator!=(const thisType& a, const PassRefPtr<thisType>& b) { return !(a == b); }
+
 /* DEFINE_TYPE_CASTS */
 
 #define DEFINE_TYPE_CASTS(thisType, argumentType, argumentName, pointerPredicate, referencePredicate) \
 inline thisType* to##thisType(argumentType* argumentName) \
 { \
     ASSERT_WITH_SECURITY_IMPLICATION(!argumentName || (pointerPredicate)); \
     return static_cast<thisType*>(argumentName); \
 } \
 inline const thisType* to##thisType(const argumentType* argumentName) \
 { \
     ASSERT_WITH_SECURITY_IMPLICATION(!argumentName || (pointerPredicate)); \
     return static_cast<const thisType*>(argumentName); \
 } \
 inline thisType& to##thisType(argumentType& argumentName) \
 { \
     ASSERT_WITH_SECURITY_IMPLICATION(referencePredicate); \
     return static_cast<thisType&>(argumentName); \
 } \
 inline const thisType& to##thisType(const argumentType& argumentName) \
 { \
     ASSERT_WITH_SECURITY_IMPLICATION(referencePredicate); \
     return static_cast<const thisType&>(argumentName); \
 } \
 void to##thisType(const thisType*); \
 void to##thisType(const thisType&)
 
 #endif /* WTF_Assertions_h */