<entry index='u'>
<name>undef</name>
<reference>inheritance</reference>
<reference>method</reference>
<reference>mix-in</reference>
<content>
    To set the ((method|Method)) undefined.

    '((|undef|))' means that the particular method can be obviated,
    while ((inheritance|Inheritance)) or ((Mix-in))
    just adds class on the method.
    However, you'll pay for the lack of prudence
    when you '((|undef|))' the method which is called from inside of
    the method, which is crucial to the implementation of the class.
</content>
</entry>
