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Transfer variable-size data using shared memory

described in documentation:

Identify types that require Zero Copy transfer over shared memory and annotate them with @transfer_mode(SHMEM_REF) in the IDL files.

 Zero Copy transfer over shared memory requires the FlatData language binding when the type is variable-size.

So, if  transfer variable-size data using shared memory, I need add @mutable。rti::flat::build_data(writer) will be used。


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