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Passing interface pointers by refernce

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Normally when I need a second point to an interface I just create a second variable and assign it to the old, like so:
NewThing = OldThing;
But I just came across a situation where I must pass an interface pointer to a function by reference and assign it to another interface pointer created within the function. I just want to make sure it is ok to use mempy() like this:
HRESULT SomeFunction(IDirectWhatever **New)
IDirectWhatever * ld = NULL
//create "old"


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