{
   my $foo = SomeClass->new();

   some_func(\$foo);
}



sub some_func {
   my ($object_ref_ref) = @_;

   $$object_ref_ref->in_element();
   ...
}


### OR ###

{
   my $foo = SomeClass->new();
   some_func($foo);
}

sub some_func {
   my ($object_ref) = @_;

   $object_ref->in_element()
   ...
}