51 struct Replace {  struct
57 struct Replace<_1, Arg1, Arg2> {  struct
62 struct Replace<_2, Arg1, Arg2> {  struct
68 struct Replace<const T, Arg1, Arg2> {  struct
69   typedef typename Replace<T, Arg1, Arg2>::type const type;  argument
74 struct Replace<TT<T1>, Arg1, Arg2> {  struct
75   typedef TT<typename Replace<T1, Arg1, Arg2>::type> type;  argument
80 struct Replace<TT<T1, T2>, Arg1, Arg2> {  struct
82              typename Replace<T2, Arg1, Arg2>::type> type;  argument
88 struct Replace<TT<T1, _2>, Arg1, Arg2> {  struct
89   typedef TT<typename Replace<T1, Arg1, Arg2>::type, Arg2> type;  argument