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Perl/Basics/Variables and Data Types/References

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A reference is very similar to a pointer in C.

Hash References

A hash reference is a scalar created using the \ operator as follows:

my %user;
$user{'name'}    = "hatter";
$user{'network'} = "";
my $hashref = \%user;

Once you've created a hashref (hash reference) you must use pointers to access a key:

print $user->{'name'} . "\n";
print $user->{'network'} . "\n";

Callback References

This involves user-defined functions. User-defined functions are covered later in this article. A callback reference is a scalar that points to a function. To create a callback reference:

my $callback = \&function_name;

To execute the callback function and pass it arguments:

$callback->($arg1, $arg2);