On Sat, 11 Apr 2015 21:20:22 -0700
SSC_perl <[email protected]> wrote:
> Could someone please explain the difference between:
>
> %{$self->{'DATA'}} = () }
>
> and
>
> $self->{'DATA'} = {}
The first line works on the physical reference $self->{'DATA'} and empties it.
The second one assigns a new empty reference to it, but if something extracted
$self->{'DATA'} and kept a copy to it, it won't be affected.
Normally, they both will have the same affect.
Regards,
>
> I was told that they are equivalent, but they're not. One works and
> the other doesn't, so they must be different. Here's the context:
>
How does it not "work"? What are the symptoms?
> --------------------
>
> sub empty_db {
> my $self = shift;
> if ($self->{'USEDBM'} eq 'sql') {
> $self->{'SQL'}->do("DELETE from $self->{'DB'}") or
> $self->{'ERRMSG'} .= $DBI::errstr and return; }
> else { %{$self->{'DATA'}} = () }
> # else { $self->{'DATA'} = {} } # This does nothing
> }
>
That may not be enough context.
Regards,
Shlomi Fish
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