<entry index='b'>
<name>Built-In Class</name>
<reference>object</reference>
<reference>instance</reference>
<reference>ruby</reference>
<reference>data</reference>
<reference>hash</reference>
<reference>thread</reference>
<content>
    ((Ruby)) interpreter built-in class which the structure of
    ((instance|Instance)) is different from usual ((object|Object)).
    To define the class which inherits these classes is not recommended.

    A built-in class of ((Ruby)) is as follows:

     * Array
     * Bignum
     * Class
     * ((Data))
     * FalseClass
     * File
     * Fixnum
     * Float
     * ((Hash))
     * IO
     * ((MatchingData))
     * Module
     * NilClass
     * Proc
     * Regexp
     * String
     * Struct
     * ((Thread))
     * TrueClass
</content>
</entry>
