<entry index='d'>
<name>Data</name>
<reference>function</reference>
<reference>object</reference>
<reference>ruby</reference>
<content>
    Wrapper to show pointer at C level as ((Ruby)) ((object|Object)).
    It is made of C pointer, the mark function, and the free function.
    The person who tries to add the ((function|Function)) to ((Ruby)) by C
    should master the usage of this class, by all means.
    Contrary to that, it is a class that have no business with a person
    whose schedule has no chance to try it.
</content>
</entry>