From: "LESS Software, Inc" <info@...>
Date: 2001-12-06T17:55:11+09:00
Subject: [ruby-talk:27660] Re: Class variables in C

Hi matz,

here the code fragment:

void Init_cups()
{
   VALUE cCups;

   cCups = rb_define_class("CUPS", rb_cObject);
/* constructor */
   rb_define_method(cCups, "initialize", cups_init, 0);
/* class structs */
   S_Printer = rb_struct_define("Printer", "name", "instance", "options",
0);
/* class-variables */
   rb_define_class_variable(cCups, "@@init", Qfalse);
   rb_define_class_variable(cCups, "@@printers", Qnil);
   rb_define_class_variable(cCups, "@@classes", Qnil);
.
.

static VALUE cups_init(VALUE self)
{
   int            num_descs, i, j;
   VALUE          opthash, st, printers, classes, pr, ok, ov, init;
   cups_dest_t    *dests;
   cups_option_t  *opts;

/* instance variables */
   rb_iv_set(self, "@copies", INT2FIX(1));
   rb_iv_set(self, "@filedesc", INT2FIX(Qnil));
   rb_iv_set(self, "@tempfile", INT2FIX(Qnil));
   rb_iv_set(self, "@printer", INT2FIX(Qnil));
   rb_iv_set(self, "@title", INT2FIX(Qnil));
   rb_iv_set(self, "@pageno", INT2FIX(0));
/* initialize class variables only once */
   if (rb_cv_get(self, "@@init") == Qfalse) {
      rb_cv_set(self, "@@init", Qtrue);
.
.
.

In my 'sample.rb' (ruby 1.6.5) the statement

        prt = CUPS.new

give me the error message:

 ./sample.rb:5:'in initialize': uninitialized class variable @@init in
#<Class 0lx401e3974> (NameError)

Thanks.

Harald



-----Urspr�ngliche Nachricht-----
Von: Yukihiro Matsumoto <matz@ruby-lang.org>
An: ruby-talk ML <ruby-talk@ruby-lang.org>
Datum: Donnerstag, 6. Dezember 2001 06:32
Betreff: [ruby-talk:27629] Re: Class variables in C


>Hi,
>
>In message "[ruby-talk:27571] Class variables in C"
>    on 01/12/06, "LESS Software, Inc" <info@less.de> writes:
>
>|I've declared a class variable with rb_declare_class_variable(class, name,
value) in C. Using this I've got
>|the errror: uninitialized class variable. May anyone help me?
>
>More information required.  Could you give me exact code and error
>messages?
>
> matz.
>