Global rb_funcall

ruby-talk
1

Hi,

i'm embedding ruby into a C++, how do i call _global_ functions from C?

like

   rb_funcall2(??, rb_intern("test"), 0, NULL);

thanks

Simon

2

=?ISO-8859-1?Q?Simon_Kr=F6ger?= wrote:

Hi,

i'm embedding ruby into a C++, how do i call _global_ functions from C?

like

   rb_funcall2(??, rb_intern("test"), 0, NULL);

thanks

All of the global methods become singleton methods of
the top-level Object object, so you should be able to
refer to rb_cObject (I am unable to test). If that
does not work, see if README.EXT provides any clues.

Simon

E

···

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Posted via http://www.ruby-forum.com/\.

3

Eero Saynatkari wrote:

=?ISO-8859-1?Q?Simon_Kr=F6ger?= wrote:

Hi,

i'm embedding ruby into a C++, how do i call _global_ functions from C?

like

  rb_funcall2(??, rb_intern("test"), 0, NULL);

thanks

All of the global methods become singleton methods of
the top-level Object object, so you should be able to
refer to rb_cObject (I am unable to test). If that
does not work, see if README.EXT provides any clues.

Simon

E

I was thinking of that possibility and dismissed the thought because "thats the class, not the object..". Well, from time to time my past trips me up.

Thanks !

Simon

4

Hi,

At Tue, 27 Dec 2005 07:55:32 +0900,
Eero Saynatkari wrote in [ruby-talk:172589]:

> i'm embedding ruby into a C++, how do i call _global_ functions from C?
>
> like
>
> rb_funcall2(??, rb_intern("test"), 0, NULL);
>
> thanks

All of the global methods become singleton methods of
the top-level Object object, so you should be able to
refer to rb_cObject (I am unable to test). If that
does not work, see if README.EXT provides any clues.

They are private instance methods of Object.

  $ ruby -e 'def foo;end; p Object.private_instance_methods.grep(/foo/)'
  ["foo"]

So the receiver is not a matter,

  rb_funcall2(Qnil, rb_intern("test"), 0, NULL);
  rb_funcall2(INT2FIX(999), rb_intern("test"), 0, NULL);
  rb_funcall2(rb_cArray, rb_intern("test"), 0, NULL);
  rb_funcall2(rb_str_new(0, 0), rb_intern("test"), 0, NULL);
  rb_funcall2(rb_ary_new(), rb_intern("test"), 0, NULL);
  rb_funcall2(rb_hash_new(), rb_intern("test"), 0, NULL);
  rb_funcall2(rb_module_new(), rb_intern("test"), 0, NULL);

all work.

···

--
Nobu Nakada