remove_instance_variable(p1)
public
Removes the named instance variable from obj, returning that
variable’s value. String arguments are
converted to symbols.
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
VALUE
rb_obj_remove_instance_variable(VALUE obj, VALUE name)
{
VALUE val = Qnil;
const ID id = id_for_var(obj, name, an, instance);
st_data_t n, v;
struct st_table *iv_index_tbl;
st_data_t index;
rb_check_frozen(obj);
if (!id) {
goto not_defined;
}
switch (BUILTIN_TYPE(obj)) {
case T_OBJECT:
iv_index_tbl = ROBJECT_IV_INDEX_TBL(obj);
if (!iv_index_tbl) break;
if (!st_lookup(iv_index_tbl, (st_data_t)id, &index)) break;
if (ROBJECT_NUMIV(obj) <= index) break;
val = ROBJECT_IVPTR(obj)[index];
if (val != Qundef) {
ROBJECT_IVPTR(obj)[index] = Qundef;
return val;
}
break;
case T_CLASS:
case T_MODULE:
n = id;
if (RCLASS_IV_TBL(obj) && st_delete(RCLASS_IV_TBL(obj), &n, &v)) {
return (VALUE)v;
}
break;
default:
if (FL_TEST(obj, FL_EXIVAR)) {
if (generic_ivar_remove(obj, id, &val)) {
return val;
}
}
break;
}
not_defined:
rb_name_err_raise("instance variable %1$s not defined",
obj, name);
UNREACHABLE_RETURN(Qnil);
}