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
Show source
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 */
}