[Nickle] is_defined()

Bart Massey bart at cs.pdx.edu
Thu May 13 02:10:04 PDT 2004

I've added
  bool is_defined(&poly)
to Nickle.  In retrospect, I hate the name.  is_defined(r)
returns false if the location referenced by r is
uninitialized, otherwise true.  Needed it for user
convenience in the code I'm writing: will show the code to
you in a day or three...


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