remove_instance_variable(p1)
public
Removes the named instance variable from obj, returning that
variable’s value.
class Dummy
attr_reader :var
def initialize
@var = 99
end
def remove
remove_instance_variable(:@var)
end
end
d = Dummy.new
d.var
d.remove
d.var
/*
* call-seq:
* obj.remove_instance_variable(symbol) => obj
*
* Removes the named instance variable from <i>obj</i>, returning that
* variable's value.
*
* class Dummy
* attr_reader :var
* def initialize
* @var = 99
* end
* def remove
* remove_instance_variable(:@var)
* end
* end
* d = Dummy.new
* d.var #=> 99
* d.remove #=> 99
* d.var #=> nil
*/
VALUE
rb_obj_remove_instance_variable(obj, name)
VALUE obj, name;
{
VALUE val = Qnil;
ID id = rb_to_id(name);
if (!OBJ_TAINTED(obj) && rb_safe_level() >= 4)
rb_raise(rb_eSecurityError, "Insecure: can't modify instance variable");
if (OBJ_FROZEN(obj)) rb_error_frozen("object");
if (!rb_is_instance_id(id)) {
rb_name_error(id, "`%s' is not allowed as an instance variable name", rb_id2name(id));
}
switch (TYPE(obj)) {
case T_OBJECT:
case T_CLASS:
case T_MODULE:
if (ROBJECT(obj)->iv_tbl && st_delete(ROBJECT(obj)->iv_tbl, (st_data_t*)&id, &val)) {
return val;
}
break;
default:
if (FL_TEST(obj, FL_EXIVAR) || rb_special_const_p(obj)) {
if (generic_ivar_remove(obj, id, &val)) {
return val;
}
}
break;
}
rb_name_error(id, "instance variable %s not defined", rb_id2name(id));
return Qnil; /* not reached */
}