Basic HTML version of Foils prepared Sept 20 97

Foil 54 ref and scalar functions

From Perl5 and Advanced Perl4 Features Computational Science for Information Age Course CPS616 -- Sept 20 97. by Geoffrey C. Fox,Nancy McCracken,Tom Scavo
1 ref EXPR returns FALSE unless EXPR is a reference (pointer)
2 If it is a reference, then ref returns
  • Package Name if EXPR blessed
  • REF if a reference
  • CODE if a subroutine
  • GLOB if a FileHandle
  • SCALAR ARRAY HASH if one of three basic types
3 scalar EXPR forces EXPR to be evaluated in scalar (as opposed to list) context and returns scalar result
4 We do not need a "list" command as [ ] constructs anonymous arrays and ( ... ) generates a list trivially
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