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I'm trying to write a C extension to ruby that'll generate a class. I'm looking on how to define some default arguments to a class. For example, if I have this class decleration in ruby: class MyClass def initialize(name, age=10) @name = name @age = age end end You can initialize it with mc = MyClass.new("blah") , and the age parameter will be set internally. How do I do this in C? So far I got this, but this forces entering the other argument: require "ruby.h" static VALUE my_init(VALUE self, VALUE name, VALUE age) { rb_iv_set(self, "@name", name); rb_iv_set(self, "@age", age); return self; } VALUE cMyClass; void Init_MyClass() { // create a ruby class instance cMyClass = rb_define_class("MyClass", rb_cObject); // connect the instance methods to the object rb_define_method(cMyClass, "initialize", my_init, 2); } I thought about checking the value of age against Qnil or using if ( TYPE(age) == T_UNDEF ) , but I just get segfaults from there. Reading through README.EXT leads me to believe I can accomplish this through rb_define_method using the value of argc , but this wasn't too clear. Any ideas? Thanks.

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