[ET Trac] [Einstein Toolkit] #1651: Problems with expansions in parameter files

[Einstein Toolkit]

#1651: Problems with expansions in parameter files
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  Reporter:  hinder  |       Owner:  sbrandt            
      Type:  defect  |      Status:  accepted           
  Priority:  major   |   Milestone:                     
 Component:  Cactus  |     Version:  development version
Resolution:          |    Keywords:                     
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Comment (by rhaas):

 I am fairly sure do not understand setonce.patch. I am not sure I
 understand in which respect setting a variable only once is different from
 disallowing parameters to change after they are being read. setonce.patch
 seems much more complex that write_after_read.

 If both achieve the same effect (up to the unary-ops-change-their-argument
 issue), I'd prefer write_after_read.patch. It seems to me as if cyclical
 references can be detected if a parameter is marked as being "written"
 right when one begins to modify it and before the RHS of the assignment is
 actually evaluated.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1651#comment:7>
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