1 // RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++11
2 
3 void f();  // expected-note{{possible target for call}}
4 void f(int);  // expected-note{{possible target for call}}
5 decltype(f) a;  // expected-error{{reference to overloaded function could not be resolved; did you mean to call it with no arguments?}} expected-error {{variable has incomplete type 'decltype(f())' (aka 'void')}}
6 
7 template<typename T> struct S {
8   decltype(T::f) * f; // expected-error {{call to non-static member function without an object argument}}
9 };
10 
11 struct K {
12   void f();
13   void f(int);
14 };
15 S<K> b; // expected-note{{in instantiation of template class 'S<K>' requested here}}
16 
17 namespace PR13978 {
18   template<typename T> struct S { decltype(1) f(); };
f()19   template<typename T> decltype(1) S<T>::f() { return 1; }
20 
21   // This case is ill-formed (no diagnostic required) because the decltype
22   // expressions are functionally equivalent but not equivalent. It would
23   // be acceptable for us to reject this case.
24   template<typename T> struct U { struct A {}; decltype(A{}) f(); };
f()25   template<typename T> decltype(typename U<T>::A{}) U<T>::f() {}
26 
27   // This case is valid.
28   template<typename T> struct V { struct A {}; decltype(typename V<T>::A{}) f(); };
f()29   template<typename T> decltype(typename V<T>::A{}) V<T>::f() {}
30 }
31