This looks like you want do_soemthing() to act both as a method and a function.
If so, you need to check the first argument passed in. Inside that sub you would decide what to do either way. 

sub do_something {
    my ($self, $param);
    $self = shift if ref $_[0] eq __PACKAGE__; # first argument is obj
+ect
    $param = shift;
    # ...do something...
    if ($self) { # method
        ...
    } else {     # function
        ...
    }
    return $param;
}

[download]

If it is a mere function internal to the class, it is good practice to prepend the function name with a dash. That's an informal convention to mark functions private to the module or class.

If it is strictly a method, then the answers of my fellow monks apply: $self->method(@args)

perl -le'print map{pack c,($-++?1:13)+ord}split//,ESEL'

In reply to Re: Calling module function from within a blessed module by shmem
in thread Calling module function from within a blessed module by Bod

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