[ET Trac] #2836: add support for different data types to GPU arrays

[Roland Haas]

#2836: add support for different data types to GPU arrays

 Reporter: Roland Haas
   Status: new
Milestone: 
  Version: 
     Type: enhancement
 Priority: major
Component: EinsteinToolkit thorn

This adds proper support for data types other than `double` to CarpetX, also for GPUs.

It introduces a helper class `AnyVector`that can hold any data type \(similar to `gdata` in CarpetLib\), as well as a number of switch statements to handle openPMD's typed output routines. 

I am told that very new versions of openPMD-api lets one call the internal un-typed output routine, but at the time this code was written, that was not yet possible, and thus may not be possible on all cluster installed copies of openPMD.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2836/add-support-for-different-data-types-to
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