1 // RUN: %clang_cc1 -std=c++11 -verify %s
2
3 struct Base {
4 static const int a = 1;
5 };
6 template<typename T> struct S : Base {
7 enum E : int;
8 constexpr int f() const;
9 constexpr int g() const;
10 void h();
11 };
12 template<> enum S<char>::E : int {}; // expected-note {{enum 'S<char>::E' was explicitly specialized here}}
13 template<> enum S<short>::E : int { b = 2 };
14 template<> enum S<int>::E : int { a = 4 };
15 template<typename T> enum S<T>::E : int { b = 8 };
16
17 // The unqualified-id here names a member of the non-dependent base class Base
18 // and not the injected enumerator name 'a' from the specialization.
f() const19 template<typename T> constexpr int S<T>::f() const { return a; }
20 static_assert(S<char>().f() == 1, "");
21 static_assert(S<int>().f() == 1, "");
22
23 // The unqualified-id here names a member of the current instantiation, which
24 // bizarrely might not exist in some instantiations.
g() const25 template<typename T> constexpr int S<T>::g() const { return b; } // expected-error {{enumerator 'b' does not exist in instantiation of 'S<char>'}}
26 static_assert(S<char>().g() == 1, ""); // expected-note {{here}} expected-error {{not an integral constant expression}}
27 static_assert(S<short>().g() == 2, "");
28 static_assert(S<long>().g() == 8, "");
29
30 // 'b' is type-dependent, so these assertions should not fire before 'h' is
31 // instantiated.
h()32 template<typename T> void S<T>::h() {
33 char c[S<T>::b];
34 static_assert(b != 8, "");
35 static_assert(sizeof(c) != 8, "");
36 }
f()37 void f() {
38 S<short>().h(); // ok, b == 2
39 }
40