From: George Ogata <g_ogata@...>
Date: 2005-04-29T21:12:08+09:00
Subject: Re: determining when inside 'class << self'

"Ara.T.Howard" <Ara.T.Howard@noaa.gov> writes:

> i like a method like this
>
>    def inside_metaclass?
>      # to be implemented
>    end
>
>    class C
>      class << self
>        p inside_metaclass? #=> true
>      end
>
>      p inside_metaclass? #=> false
>    end
>
>    p inside_metaclass? #=> false
>
>    class << []
>      p inside_metaclass? #=> true
>    end
>
> can this be done?

Is this cheating?:

#include "ruby.h"

VALUE metaclass_p(VALUE self) {
  if (FL_TEST(self, FL_SINGLETON))
    return Qtrue;
  else
    return Qfalse;
}

void Init_test(void) {
  rb_define_method(rb_cClass, "metaclass?", metaclass_p, 0);
}