A dispatch table 

my %dispatch_table = (
    foo => \&foo,
    bar => sub { mumble; },
);

[download]

A sub returning a sub generated on the fly, maybe a closure, 

sub generate {
    my $foo = shift;
    sub { $foo };
}

[download]

A variable routine to be called, 

sub callit {
    my $sub = shift;
    $sub->(@_);
}

[download]

Overriding a sub, 

# in a scope . . .
    local *foo = generate 'bar';

[download]

The list goes on . . .

After Compline,
Zaxo

In reply to Re: reference to a sub by Zaxo
in thread reference to a sub by Anonymous Monk

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