Add an `is_extents` and `is_extents_v` type trait
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@brycelelbach is already working on this.
Since May 1, 2018.
subject - mdspan (P0009)
work - wording
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- HTML
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Description
This will help describe type requirements involving extents. E.g. we can just say the requirement is is_extents_v<Extents> == true.
Look to the SIMD types paper/Parallelism TS v2 for examples of how this might be worded.
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