perl function tied

The tied function in Perl returns a reference to the object that the specified variable is currently "tied" to. A tied variable is one that has been associated with a package that has defined the necessary methods to handle operations on that variable.

Here's an example:

package MyHash;
use strict;
use warnings;

sub TIEHASH {
    my ($class) = @_;
    my $hash = {};
    bless $hash, $class;
    return $hash;
}

sub STORE {
    my ($self, $key, $value) = @_;
    print "Storing $value for key $key\n";
    $self->{$key} = $value;
}

sub FETCH {
    my ($self, $key) = @_;
    print "Fetching value for key $key\n";
    return $self->{$key};
}

package main;

my %hash;
tie %hash, 'MyHash';

$hash{foo} = 'bar';  # This calls the STORE method in MyHash
my $tied = tied(%hash);
print "The hash is tied to ", ref($tied), "\n";

In this example, we define a package called MyHash that provides methods to handle operations on a hash. We then create a hash %hash and tie it to the MyHash package using the tie function.

After storing a value in the hash, we call the tied function to get a reference to the object that %hash is tied to. We then print out the name of the package that the hash is tied to.

Output:

Storing bar for key foo
The hash is tied to MyHash