Hi, I am using protobuf in C++ but confused by set_allocated_xxx. For 
example, there is a message PB_a which has a member of message PB_b. First 
create a PB_a object named aa and a PB_b object named bb via new PB_a() and 
new PB_b(). Then add bb to aa via set_allocated_PB_b(). So the question is 
how to free bb, by delete aa, or by delete bb? Thanks.

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