12 protected A (object x
)
16 public virtual int this [int i
] {
30 public override int this [int i
] {
32 base [i
: i
] = value + 4;
37 class XAttribute
:Attribute
39 public XAttribute (int h
)
47 static void Foo (int a
)
51 public static int Main ()
60 Console
.WriteLine ("ok");