On Sunday 26 September 2010 19:14:37 Jim Gibson wrote:
> At 2:00 AM -0700 9/25/10, feltra wrote:
> >Hi,
> >
> >Am using arrays with only references in a sub-routine. While I got
> >the hang of how to access an element of the array using the '->'
> >operator, I do not know how to intialize this array. I.e. I want to
> >be able to do something like
> >
> >@myarr=(); $#myarr = -1;
> >
> >inside the subroutine, but myarr is only a reference to an array not
> >the actual array...
>
> [] is the notation for a reference to an array.
>
> For example, if you want to initialize a scalar variable so that it
> contains a reference to an anonymous, empty array, you would do this:
>
> my $myarr = [];
>
There is a difference between saying:
sub my_sub
{
my ($array_ref) = @_;
$array_ref = [];
}
And:
sub my_sub
{
my ($array_ref) = @_;
@{$array_ref} = ();
}
The first code does not modify the array referenced by the original reference
(which may be an anonymous one) while the second version does. I don't know
what the original poster wants, though.
Regards,
Shlomi Fish
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