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;
func_ref()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>
f()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>
not_instantiated()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>
fi()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
main()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*);
f()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
61 namespace { template<typename> extern int n; }
g()62 template<typename T> int g() { return n<int>; }
63 namespace { extern template int n<int>; } // expected-error {{explicit instantiation declaration of 'n<int>' with internal linkage}}
64
65 #endif
66
67