Fastest way to check if a WeakRc points at a real object?

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I have a Weak<T>. I want to know if it points at a real object or a null. (i.e. get a bool).

The current options seem to be:

  1. strong_count ( rc.rs - source ) > 0

  2. upgrade ( rc.rs - source ) != None

As it turns out, need neither a ptr nor a count. I just want to know if it's null or not. What is the cheapest way to do this (and what is the cost of the cheapest way).

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There won't be anything faster than strong_count > 0, since that is what any method would have to do under the hood. I expect the upgrade option would also optimize to this, but haven't done any tests.

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