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Want non-allocating array views #14955

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I couldn't find an open issue for this frequently-noted problem, so I'm filing this. Feel free to close if there's an earlier one.

It's worth linking to https://groups.google.com/forum/#!topic/julia-users/6Z1kJ5LrSMU, where it was pointed out that "faking" a view as (A, R), where R is a CartesianRange, is currently the cleanest way to circumvent this problem (but can only handle the equivalent of Int/UnitRange/Colon indexes). Various solutions using Ptr have also been employed in the past, but of course those suffer from the standpoint of garbage-collection safety.

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