From: Paulo Jabardo <pjabardo@...>
Date: 2005-07-08T04:51:25+09:00
Subject: Inconsistent(?) when including modules

I was playing around with modules when I noticed that
I counld, for example include Math and use sin,cos,etc
as if it were a common method. When I tried to do the
same in irb

module Test
  def Test.triple(x)
     3*x
  end
end

Test.triple 2 => 6

If I include Test from the toplevel
inlcude Test

and then call triple directly I get an error:
irb(main):005:0> triple 2
NoMethodError: undefined method `triple' for
main:Object
        from (irb):5


I then tried to implement the same module as an
extension:

#include <ruby.h>

static VALUE triple(VALUE self, VALUE x){
  return rb_float_new(3.0*NUM2DBL(x));
}

VALUE modulo;

void Init_TestC(){
  modulo = rb_define_module("TestC");
  rb_define_module_function(modulo, "triple", triple,
1);
}
  
When I load this extension,
require 'TestC.so'

TestC.triple 2 => 6

include TestC
triple 2 => 6   # No error

I haven't seen this documented. Can I get this same
behaviour from ruby code or do I need to write an
extension?

Thanks

Paulo Jabardo


	
	
		
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