[ET Trac] [Einstein Toolkit] #1554: Want to define constants in parameter files

[Einstein Toolkit]

#1554: Want to define constants in parameter files
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  Reporter:  eschnett     |       Owner:  sbrandt            
      Type:  enhancement  |      Status:  closed             
  Priority:  major        |   Milestone:                     
 Component:  Cactus       |     Version:  development version
Resolution:  fixed        |    Keywords:                     
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Comment (by rhaas):

 I had not even realized that parameter values could be used in
 expressions, is this documented? Requiring '$' may depend on whether we
 want to blur the distinction between Cactus parameters and the constants
 defined in the parfile (and $parfile and $ENV{...} which currently exit).
 I am not sure where I stand on this. Aesthetically I prefer "$" (since I
 associate it with "scripts"). There seems to be no reason for it though.
 Syntaxwise it should be fine since we no longer support global Cactus
 parameters (which don't have the "::" in the name) anymore, I suspect we
 can live with the ambiguity of {{{ActiveThorns = "a b"}}} not being the
 assignment of a constant named "ActiveThorns" but instead a directive.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1554#comment:28>
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