1 // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s 2 3 template<typename S> 4 struct A { 5 typedef S B; 6 template<typename T> using C = typename T::B; 7 template<typename T> struct D { 8 template<typename U> using E = typename A<U>::template C<A<T>>; 9 template<typename U> using F = A<E<U>>; 10 template<typename U> using G = C<F<U>>; 11 G<T> g; 12 }; 13 typedef decltype(D<B>().g) H; 14 D<H> h; 15 template<typename T> using I = A<decltype(h.g)>; 16 template<typename T> using J = typename A<decltype(h.g)>::template C<I<T>>; 17 }; 18 19 A<int> a; 20 A<char>::D<double> b; 21 22 template<typename T> T make(); 23 24 namespace X { 25 template<typename T> struct traits { 26 typedef T thing; 27 typedef decltype(val(make<thing>())) inner_ptr; 28 29 template<typename U> using rebind_thing = typename thing::template rebind<U>; 30 template<typename U> using rebind = traits<rebind_thing<U>>; 31 32 inner_ptr &&alloc(); 33 void free(inner_ptr&&); 34 }; 35 36 template<typename T> struct ptr_traits { 37 typedef T *type; 38 }; 39 template<typename T> using ptr = typename ptr_traits<T>::type; 40 41 template<typename T> struct thing { 42 typedef T inner; 43 typedef ptr<inner> inner_ptr; 44 typedef traits<thing<inner>> traits_type; 45 46 template<typename U> using rebind = thing<U>; 47 thingX::thing48 thing(traits_type &traits) : traits(traits), val(traits.alloc()) {} ~thingX::thing49 ~thing() { traits.free(static_cast<inner_ptr&&>(val)); } 50 51 traits_type &traits; 52 inner_ptr val; 53 val(const thing & t)54 friend inner_ptr val(const thing &t) { return t.val; } 55 }; 56 57 template<> struct ptr_traits<bool> { 58 typedef bool &type; 59 }; alloc()60 template<> bool &traits<thing<bool>>::alloc() { static bool b; return b; } free(bool &)61 template<> void traits<thing<bool>>::free(bool&) {} 62 } 63 64 typedef X::traits<X::thing<int>> itt; 65 66 itt::thing::traits_type itr; 67 itt::thing ith(itr); 68 69 itt::rebind<bool> btr; 70 itt::rebind_thing<bool> btt(btr); 71 72 namespace PR11848 { 73 template<typename T> using U = int; 74 75 template<typename T, typename ...Ts> f1(U<T> i,U<Ts>...is)76 void f1(U<T> i, U<Ts> ...is) { // expected-note 2{{couldn't infer template argument 'T'}} 77 return i + f1<Ts...>(is...); 78 } 79 80 // FIXME: This note is technically correct, but could be better. We 81 // should really say that we couldn't infer template argument 'Ts'. 82 template<typename ...Ts> f2(U<Ts>...is)83 void f2(U<Ts> ...is) { } // expected-note {{requires 0 arguments, but 1 was provided}} 84 85 template<typename...> struct type_tuple {}; 86 template<typename ...Ts> f3(type_tuple<Ts...>,U<Ts>...is)87 void f3(type_tuple<Ts...>, U<Ts> ...is) {} // expected-note {{requires 4 arguments, but 3 were provided}} 88 g()89 void g() { 90 f1(U<void>()); // expected-error {{no match}} 91 f1(1, 2, 3, 4, 5); // expected-error {{no match}} 92 f2(); // ok 93 f2(1); // expected-error {{no match}} 94 f3(type_tuple<>()); 95 f3(type_tuple<void, void, void>(), 1, 2); // expected-error {{no match}} 96 f3(type_tuple<void, void, void>(), 1, 2, 3); 97 } 98 99 template<typename ...Ts> 100 struct S { 101 S(U<Ts>...ts); 102 }; 103 104 template<typename T> 105 struct Hidden1 { 106 template<typename ...Ts> 107 Hidden1(typename T::template U<Ts> ...ts); 108 }; 109 110 template<typename T, typename ...Ts> 111 struct Hidden2 { 112 Hidden2(typename T::template U<Ts> ...ts); 113 }; 114 115 struct Hide { 116 template<typename T> using U = int; 117 }; 118 119 Hidden1<Hide> h1; 120 Hidden2<Hide, double, char> h2(1, 2); 121 } 122 123 namespace Core22036 { 124 struct X {}; 125 void h(...); 126 template<typename T> using Y = X; 127 template<typename T, typename ...Ts> struct S { 128 // An expression can contain an unexpanded pack without being type or 129 // value dependent. This is true even if the expression's type is a pack 130 // expansion type. f1Core22036::S131 void f1(Y<T> a) { h(g(a)); } // expected-error {{undeclared identifier 'g'}} f2Core22036::S132 void f2(Y<Ts>...as) { h(g(as)...); } // expected-error {{undeclared identifier 'g'}} f3Core22036::S133 void f3(Y<Ts>...as) { g(as...); } // ok f4Core22036::S134 void f4(Ts ...ts) { h(g(sizeof(ts))...); } // expected-error {{undeclared identifier 'g'}} 135 // FIXME: We can reject this, since it has no valid instantiations because 136 // 'g' never has any associated namespaces. f5Core22036::S137 void f5(Ts ...ts) { g(sizeof(ts)...); } // ok 138 }; 139 } 140 141 namespace PR13243 { 142 template<typename A> struct X {}; 143 template<int I> struct C {}; 144 template<int I> using Ci = C<I>; 145 f(X<A>,Ci<I>)146 template<typename A, int I> void f(X<A>, Ci<I>) {} 147 template void f(X<int>, C<0>); 148 } 149 150 namespace PR13136 { 151 template <typename T, T... Numbers> 152 struct NumberTuple { }; 153 154 template <unsigned int... Numbers> 155 using MyNumberTuple = NumberTuple<unsigned int, Numbers...>; 156 157 template <typename U, unsigned int... Numbers> 158 void foo(U&&, MyNumberTuple<Numbers...>); 159 160 template <typename U, unsigned int... Numbers> 161 void bar(U&&, NumberTuple<unsigned int, Numbers...>); 162 main()163 int main() { 164 foo(1, NumberTuple<unsigned int, 0, 1>()); 165 bar(1, NumberTuple<unsigned int, 0, 1>()); 166 return 0; 167 } 168 } 169