For

RefPtr<T> GetFoo() {
  RefPtr<T> foo;
  // ...
}

should we:

1. return foo and expect RVO to kick in to eliminate additional AddRef/Release
2. return foo.forget()
3. return Move(foo)

Which one is preferred?

ps: I find gcc is able to apply RVO even with "-O0". Not sure if it is also 
true for other compilers.
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