Is there a reason to prefere the usage of boost::multi_array_ref over boost::multi_array&? Why is the adapter class boost::multi_array_ref provided by boost at all?
boost::multi_array_ref vs. boost::multi_array&
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Those would be two quite different things.
boost::multi_array&is a reference which can be bound to already existing multi array, and you can use it for indirection to a 'true' multi array container.On the other hand,
boost::multi_array_refis an adaptor - it allows one to use it with any other block of continuous data as if it was a multi array (while in fact it is not). (I personally think this is not a great name, as it implies a reference to the container)See https://www.boost.org/doc/libs/1_73_0/libs/multi_array/doc/reference.html for more details.