Excerpts from Yuri Shtil's message of Tue Aug 18 12:15:03 -0700 2009:
> Actually I realized I made a mistake in my question.
> I want to be able to make an attribute read only after changing it in
> certain places of my code. The reason is that I want to control access
> similar to private in C++;
Don't change it to readonly; make the writer private ('_set_foo').
is => 'ro'
is just a shortcut for
reader => $attribute_name
so you would do something like
has foo => (is => 'ro', writer => '_set_foo');
An attribute is actually never 'readonly' in some inherent sense -- the methods
attached to it generates may allow writing, or may not, but there's no security
layer behind those methods stopping you from setting the slot value.
hdp.
