From: Geert Fannes <Geert.Fannes@...>
Date: 2006-01-30T18:12:13+09:00
Subject: inheritance from C object with different parameter count

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Hello,

I'm trying to create a derived class (ruby class) from a C-implemented
class. Everything works fine, until I tried to add a parameter to the
derived class. When I derive from a pure ruby base class, everything
works as should be, extra parameter or not. Does someone know what is
going on or what I am doing wrong?

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I am getting the following output:

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gfannes@lt-gfannes help $ ruby test.rb

test.rb:21:in `new': wrong number of arguments (1 for 0) (ArgumentError)

        from test.rb:21

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This is the ruby file containing the derivation from the base class. If
bCLib is set to false, things work as should be.

##############test.rb######################

bCLib=3Dtrue

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if bCLib

  require('base.so')

else

  class Base

    def initialize()

      puts("base")

    end

  end

end

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class Derived < Base

  def initialize(parameter)

    puts("init derived")

    super()

    puts("finished super")

  end

end

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Derived.new('parameter')

##########################################

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This is the C-file that implements the base class in C
######################base.c#####################

#include "ruby.h"

#include <stdio.h>

#include <malloc.h>

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typedef struct{

  double dValue;

} baseStruct;

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VALUE f_new0(VALUE klass)

{

  printf("f_new0.\n");

  VALUE rBase;

  baseStruct *pBase=3Dmalloc(sizeof(baseStruct));

  rBase =3D Data_Wrap_Struct(klass, 0, free, pBase);

  printf("before rb_obj_call_init.\n");

  rb_obj_call_init(rBase, 0, 0);

  printf("f_new0 finished.\n");

  return rBase;

}

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VALUE f_initialize0(VALUE self)

{

  printf("f_initialize0.\n");

  return self;

}

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VALUE cBase;

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void Init_base()

{

  cBase=3Drb_define_class("Base",rb_cObject);

  rb_define_singleton_method(cBase, "new", f_new0, 0);

  rb_define_method (cBase, "initialize", f_initialize0, 0); }
#################################################

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Everything is compiled using extconf.rb

#############extconf.rb##########################

require 'mkmf'

create_makefile('base')

#################################################

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