39 struct Replace {  struct
45 struct Replace<_1, Arg1, Arg2> {  argument
50 struct Replace<_2, Arg1, Arg2> {  argument
56 struct Replace<const T, Arg1, Arg2> {  argument
57   typedef typename Replace<T, Arg1, Arg2>::type const type;  argument
62 struct Replace<TT<T1>, Arg1, Arg2> {  struct
63   typedef TT<typename Replace<T1, Arg1, Arg2>::type> type;  argument
68 struct Replace<TT<T1, T2>, Arg1, Arg2> {  struct
70              typename Replace<T2, Arg1, Arg2>::type> type;  argument
76 struct Replace<TT<T1, _2>, Arg1, Arg2> {  struct
77   typedef TT<typename Replace<T1, Arg1, Arg2>::type, Arg2> type;  argument