From: Eric Christopherson <echristopherson@...>
Date: 2012-04-03T09:29:06+09:00
Subject: Re: TypeError Message. Help required

On Mon, Apr 2, 2012 at 2:18 PM, Tridib Bandopadhyay
<lists@ruby-forum.com> wrote:
> I have created an extension and within the extension file I have
> declared one function like-
>
> VALUE free(T * self, VALUE name)    //T is the struct
> {
>   free(StringValuePtr(name));
> }
>
> rb_define_method(hw_cMyClass, "free", talloc_free,0);
>
> And from *.rb file I am calling the free function like
>
> t.free()
>
>
> But its giving me error like-
>
> rungc.rb:10:in `free': can't convert false into String (TypeError)
>        from rungc.rb:10
>
> Can anyone tell me what I am doing wrong? ANd how to fix it?

I don't know precisely, but I can tell you that your call to
rb_define_method sets it up so the C function `talloc_free` is the
implementation of the Ruby `free` method -- not the function you have
defined as `free`. Also note that it's a bad idea (if it's allowed at
all) to name something `free` in C -- that's the name of the standard
library's free function.