Basic HTML version of Foils prepared April 16,1996

Foil 57 tie() and untie() Perl Functions - III

From Perl5 and Advanced Perl4 Features Computational Science for Information Age Course CPS616 Material -- April 16,1996. by Geoffrey C. Fox
FETCH -- get variable value
STORE -- store variable value
DESTROY -- destroy variable
Tied hashes also should provide
  • EXISTS (implements exists)
  • DELETE (delete one key) CLEAR (clear out all keys)
  • FIRSTKEY() and together with
  • NEXTKEY() system implements keys() and each()
Note User provides these functions as they depend on particular behind the scenes manipulations
Note standard classes provide ability to specify user routines BEGIN and END to be run at beginning and end of invocation of a class

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