Hey,
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
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