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// RUN: %clang_cc1 -fsyntax-only -std=c++11 -verify %s
// RUN: %clang_cc1 -fsyntax-only -std=c++1y -verify %s -DCXX1Y
#ifndef CXX1Y
template<typename T, typename U, U> using alias_ref = T;
template<typename T, typename U, U> void func_ref() {}
template<typename T, typename U, U> struct class_ref {};
template<int N>
struct U {
static int a;
};
template<int N> struct S; // expected-note 6{{here}}
template<int N>
int U<N>::a = S<N>::kError; // expected-error 6{{undefined}}
template<typename T>
void f() {
(void)alias_ref<int, int&, U<0>::a>(); // expected-note {{here}}
(void)func_ref<int, int&, U<1>::a>(); // expected-note {{here}}
(void)class_ref<int, int&, U<2>::a>(); // expected-note {{here}}
};
template<typename T>
void not_instantiated() {
// These cases (arguably) do not require instantiation of U<i>::a.
(void)alias_ref<int, int&, U<3>::a>();
(void)func_ref<int, int&, U<4>::a>();
(void)class_ref<int, int&, U<5>::a>();
};
template<int N>
void fi() {
(void)alias_ref<int, int&, U<N>::a>(); // expected-note {{here}}
(void)func_ref<int, int&, U<N+1>::a>(); // expected-note {{here}}
(void)class_ref<int, int&, U<N+2>::a>(); // expected-note {{here}}
};
int main() {
f<int>(); // expected-note 3{{here}}
fi<10>(); // expected-note 3{{here}}
}
namespace N {
template<typename T> struct S { static int n; }; // expected-note {{declared here}}
template<typename T> int S<T>::n = 5;
void g(int*);
template<typename T> int f() {
int k[S<T>::n]; // expected-warning {{variable length arrays in C++ are a Clang extension}} \
expected-note {{read of non-const variable 'n' is not allowed in a constant expression}}
g(k);
return k[3];
}
int j = f<int>(); // expected-note {{in instantiation of function template specialization 'N::f<int>' requested here}}
}
#else
namespace { template<typename> extern int n; }
template<typename T> int g() { return n<int>; }
namespace { extern template int n<int>; } // expected-error {{explicit instantiation declaration of 'n<int>' with internal linkage}}
#endif
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