Bug 629200 part 5 - Add assignment operator to nsAttrValue; r=bz

content/base/src/nsAttrValue.cpp

@@ -171,6 +171,10 @@ nsAttrValue::Reset()
 void
 nsAttrValue::SetTo(const nsAttrValue& aOther)
 {
+  if (this == &aOther) {
+    return;
+  }
+
   switch (aOther.BaseType()) {
     case eStringBase:
     {

content/base/src/nsAttrValue.h

@@ -106,6 +106,8 @@ public:
   explicit nsAttrValue(const nsIntMargin& aValue);
   ~nsAttrValue();
 
+  inline const nsAttrValue& operator=(const nsAttrValue& aOther);
+
   static nsresult Init();
   static void Shutdown();
 
@@ -397,6 +399,13 @@ private:
  * Implementation of inline methods
  */
 
+inline const nsAttrValue&
+nsAttrValue::operator=(const nsAttrValue& aOther)
+{
+  SetTo(aOther);
+  return *this;
+}
+
 inline nsIAtom*
 nsAttrValue::GetAtomValue() const
 {