method

remove_class_variable

v1_9_3_125 - Show latest stable - Class: Module

remove_class_variable(p1)

public

Removes the definition of the sym, returning that constant’s value.

class Dummy
  @@var = 99
  puts @@var
  remove_class_variable(:@@var)
  p(defined? @@var)
end

produces:

99
nil

VALUE
rb_mod_remove_cvar(VALUE mod, VALUE name)
{
    const ID id = rb_to_id(name);
    st_data_t val, n = id;

    if (!rb_is_class_id(id)) {
	rb_name_error(id, "wrong class variable name %s", rb_id2name(id));
    }
    if (!OBJ_UNTRUSTED(mod) && rb_safe_level() >= 4)
	rb_raise(rb_eSecurityError, "Insecure: can't remove class variable");
    rb_check_frozen(mod);
    if (RCLASS_IV_TBL(mod) && st_delete(RCLASS_IV_TBL(mod), &n, &val)) {
	return (VALUE)val;
    }
    if (rb_cvar_defined(mod, id)) {
	rb_name_error(id, "cannot remove %s for %s",
		 rb_id2name(id), rb_class2name(mod));
    }
    rb_name_error(id, "class variable %s not defined for %s",
		  rb_id2name(id), rb_class2name(mod));
    return Qnil;		/* not reached */
}

remove_class_variable

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