Re^7: Tim O'Reilly on Perl

[holli]

Yeah. The problem with them is one can't check the value before it is set. I would like to have something like

sub foo : get
{
  my $self = shift;
  return $self->{_foo};
}

sub foo : set
{
  my $self  = shift;
  my $value = shift;
  
  die "foo is a integer field!\n"
    unless $value =~ /[+-]?[0-9]+/;
  
  $self->{_foo} = $value;
}

[Zaxo]

The problem with them is one can't check the value before it is set.

Oh, but you can. I addressed that in To Validate Data In Lvalue Subs. The Constrained package from that node turned out to have lots of other uses, too. It's now called Tie::Constrained on CPAN.