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Just for the fun of it.

#!/usr/local/bin/perl package MyTie; use Tie::Hash; @ISA=(Tie::ExtraHash); sub STORE { my $self=shift; my $key=shift; my $value=shift; if ( grep /^$key$/, @{$self->[1]} ) { warn "key $key not valid"; return undef; } return $self->[0]{$key}=$value; } 1; package main; use strict; use Data::Dumper; my $rhash; tie %$rhash, 'MyTie', [qw(not ok)]; $rhash->{b}=2; $rhash->{not}=2; warn Dumper($rhash); 1;
Of course, the solutions given above are much better, but isn't perl just a lot of fun.......
Of course, the compiler will not complain on this solution, so it is only a half solution.

Dr. Mark Ceulemans
Senior Consultant
BMC, Belgium

In reply to Re: hash, a troublemaker? by mce
in thread hash, a troublemaker? by Doraemon

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