From: Daniel Berger <Daniel.Berger@...>
Date: 2005-11-23T02:54:23+09:00
Subject: C extensions and class constants nested within modules

Hi all,

This appears to be perfectly legal Ruby code:

module Foo
    class Bar
    end
    class Bar::Baz
    end
end

p Foo::Bar.new       # ok
p Foo::Bar::Baz.new  # ok

However, an equivalent C extension has problems:

void Init_foo(){
    VALUE mFoo    = rb_define_module("Foo");
    VALUE cBar    = rb_define_class_under(mFoo, "Bar", rb_cObject);
    VALUE cBarBaz = rb_define_class_under(mFoo, "Bar::Baz", rb_cObject);
}

p Foo::Bar.new      # ok
p Foo::Bar::Baz.new # uninitialized constant Foo::Bar::Baz (NameError)

Why doesn't that work?

The only way I could get it to work was to declare "Baz" under "Bar".  But is 
that really the same thing?

Regards,

Dan

PS - I may have asked this before, but I'm old, my mind is going and Google is 
failing me.