1 // RUN: %clang_cc1 -fsyntax-only -std=c++11 -verify %s 2 // RUN: %clang_cc1 -fsyntax-only -std=c++1y -verify %s -DCXX1Y 3 4 #ifndef CXX1Y 5 6 template<typename T, typename U, U> using alias_ref = T; 7 template<typename T, typename U, U> void func_ref() {} 8 template<typename T, typename U, U> struct class_ref {}; 9 10 template<int N> 11 struct U { 12 static int a; 13 }; 14 15 template<int N> struct S; // expected-note 6{{here}} 16 17 template<int N> 18 int U<N>::a = S<N>::kError; // expected-error 6{{undefined}} 19 20 template<typename T> 21 void f() { 22 (void)alias_ref<int, int&, U<0>::a>(); // expected-note {{here}} 23 (void)func_ref<int, int&, U<1>::a>(); // expected-note {{here}} 24 (void)class_ref<int, int&, U<2>::a>(); // expected-note {{here}} 25 }; 26 27 template<typename T> 28 void not_instantiated() { 29 // These cases (arguably) do not require instantiation of U<i>::a. 30 (void)alias_ref<int, int&, U<3>::a>(); 31 (void)func_ref<int, int&, U<4>::a>(); 32 (void)class_ref<int, int&, U<5>::a>(); 33 }; 34 35 template<int N> 36 void fi() { 37 (void)alias_ref<int, int&, U<N>::a>(); // expected-note {{here}} 38 (void)func_ref<int, int&, U<N+1>::a>(); // expected-note {{here}} 39 (void)class_ref<int, int&, U<N+2>::a>(); // expected-note {{here}} 40 }; 41 42 int main() { 43 f<int>(); // expected-note 3{{here}} 44 fi<10>(); // expected-note 3{{here}} 45 } 46 47 namespace N { 48 template<typename T> struct S { static int n; }; 49 template<typename T> int S<T>::n = 5; 50 void g(int*); 51 template<typename T> int f() { 52 int k[S<T>::n]; 53 g(k); 54 return k[3]; 55 } 56 int j = f<int>(); 57 } 58 59 #else 60 // expected-no-diagnostics 61 62 namespace { template<typename> extern int n; } 63 template<typename T> int g() { return n<int>; } 64 namespace { extern template int n<int>; } 65 66 #endif 67 68