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Ruby Programming
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Ruby Objects in C

The first thing we need to look at is how to represent and access Ruby datatypes from within C. Everything in Ruby is an object, and all variables are references to objects. In C, this means that the type of all Ruby variables is VALUE, which is either a pointer to a Ruby object or an immediate value (such as Fixnum).

This is how Ruby implements object-oriented code in C: a Ruby object is an allocated structure in memory that contains a table of instance variables and information about the class. The class itself is another object (an allocated structure in memory) that contains a table of the methods defined for that class. On this foundation hangs all of Ruby.
Ruby Programming
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