[ET Trac] [Einstein Toolkit] #1455: CCTK_InterpGridArrays should give an error if an input variable index is -1

[Einstein Toolkit]

#1455: CCTK_InterpGridArrays should give an error if an input variable index is -1
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  Reporter:  hinder   |       Owner:                     
      Type:  defect   |      Status:  closed             
  Priority:  minor    |   Milestone:                     
 Component:  Cactus   |     Version:  development version
Resolution:  invalid  |    Keywords:                     
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Changes (by hinder):

  * status:  new => closed
  * resolution:  => invalid


Comment:

 I guess it was a mistake to use the same integer (-1) both as a return
 error code, and a code to mean "no variable" in the interpolator
 interface.  Is there anything we can do to avoid people getting caught by
 this? Obviously the return value of CCTK_VarIndex should have been
 checked, but people don't always do this.  If this is part of the
 documented API of both functions, and we don't want to change that, I
 guess we're stuck.  Maybe in future we design a C++ API which has a more
 friendly error-reporting method than return values, such as exceptions.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1455#comment:2>
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