From: ts <decoux@...>
Date: 2001-02-08T03:07:41+09:00
Subject: [ruby-talk:10520] Re: Embedded Ruby (Part III)

>>>>> "O" == Olivier CARRERE <olivier@vibes.net> writes:

O> I've got another question : what use is the 'state' used in
O> rb_eval_string_protect() wich is not in rb_eval_string()?

 It is used to indicate an error.

 If you have an error with rb_eval_string() ruby will call rb_raise() and
there are many chance that your program crash.

 With rb_eval_string_protect(), rb_eval_string() is protected and ruby
return the error in state, you can write something like (if the error is
not fatal)

   rb_eval_string_protect(string, &state);
   if (state) {
      VALUE c = rb_funcall(rb_gv_get("$!"), rb_intern("to_s"), 0);
      fprintf(stderr, "ERROR %s", RSTRING(c)->ptr);
   }


Guy Decoux