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If I have 10 threads, and an array of 10 sub-arrays, is it safe to have each thread do work on a different one of the sub-arrays? i.e. thread[0] does stuff to array[0], thread[1] does stuff to array[1], etc. Or is this not safe to do? Does it make a difference if it’s a vector or array (or any data set for that matter)?
If you create a “mother-array” which contains 10 smaller arrays and each thread is accessing one of those arrays exclusively then nothing bad can happen. The size of the elements of those arrays does not matter.
If you use more complex structures instead of arrays, if reading does not change anything then you are safe too. However, if a simple read from the structure can modify it (e.g. something is cached, reorganised), having parallel threads accessing the mother-structure can be problematic.
Apart from that – I don’t see any case when this could cause trouble.