read_next_sample take_next_sample SampleInfo

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Proper use of take_next_sample() and SampleInfo

I have an application that uses read_next_sample()/take_next_sample().   What is the proper way for the application to determine if a valid sample has been read/taken.  Does return value of DDS_RETURN_OK indicate a valid sample?  Or must SampleInfo.valid_data also be checked before using the sample data?

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