how to implement bool NetDeltaSerialize(FNetDeltaSerializeInfo & DeltaParms);

I want to replicate a custom struct, which contains a TArray>, how to implement it?

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thanks for replying.
I have read the code before, the example there is FFastArraySerializer(), which contains a lot its own logic there. I just want know the meaning of @DeltaParms, so I can write my own to serialize shared pointer array. Any doc or simpler example there?