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