33     template<typename> struct Inner {  struct
34       static const unsigned value = 1;
38     struct Inner<tuple<pair<Types, YTypes>...> > {  struct
39       static const unsigned value = sizeof...(Types) - sizeof...(YTypes);
56     template<typename, typename> struct Inner {  struct
57       static const unsigned value = 0;
61     struct Inner<tuple<pair<Types, YTypes>...>,  struct
63       static const unsigned value = 1;
84     template<typename> struct Inner {  struct
85       static const unsigned value = 1;
89     struct Inner<R(pair<Types, YTypes>...)> {  struct
90       static const unsigned value = sizeof...(Types) - sizeof...(YTypes);
114     template<typename, typename> struct Inner {  struct
115       static const unsigned value = 0;
119     struct Inner<tuple<pair<Types1, Types2>...>,  struct
121       static const unsigned value = 1;
146     template<typename> struct Inner {  struct
147       static const unsigned value = 0;
151     struct Inner<tuple<unsigned_pair<Values1, Values2>...>> {  struct
152       static const unsigned value = 1;
171     template<typename> struct Inner {  struct
172       static const unsigned value = 0;
176     struct Inner<tuple<Templates<Types>...>> {  struct
177       static const unsigned value = 1;
201       template<typename...B> struct Inner {  struct
203 …    constexpr auto f(A ...a, B ...b, C ...c) const -> decltype(g(a+b+c...)) { return g(a+b+c...); }  in f()