Basic HTML version of Foils prepared Sept 20 97

Foil 39 Inheritance in Perl5

From Perl5 and Advanced Perl4 Features Computational Science for Information Age Course CPS616 -- Sept 20 97. by Geoffrey C. Fox,Nancy McCracken,Tom Scavo
This is implemented "by hand" using @ISA which is defined for every package and contains list of packages to be searched for unsatisfied externals
package Fred;
require Exporter; # Make package Exporter available to Fred
@ISA = qw(Exporter); # Exporter is to be searched for unsatisfied externals
# See Exporter manual page for more details
Of course AUTOLOAD mechanism kicks in as technique of last resort if cannot find a subroutine anywhere else

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