1// RUN: %clang_cc1 -ffreestanding -fsyntax-only -verify -std=c++11 %s
2
3#include "limits.h"
4
5template<typename T, typename U>
6struct is_same_type {
7  static const bool value = false;
8};
9template <typename T>
10struct is_same_type<T, T> {
11  static const bool value = true;
12};
13
14__underlying_type(int) a; // expected-error {{only enumeration types}}
15__underlying_type(struct b) c; // expected-error {{only enumeration types}}
16
17enum class f : char;
18static_assert(is_same_type<char, __underlying_type(f)>::value,
19              "f has the wrong underlying type");
20
21enum g {d = INT_MIN };
22static_assert(is_same_type<int, __underlying_type(g)>::value,
23              "g has the wrong underlying type");
24
25__underlying_type(f) h;
26static_assert(is_same_type<char, decltype(h)>::value,
27              "h has the wrong type");
28
29template <typename T>
30struct underlying_type {
31  typedef __underlying_type(T) type; // expected-error {{only enumeration types}}
32};
33
34static_assert(is_same_type<underlying_type<f>::type, char>::value,
35              "f has the wrong underlying type in the template");
36
37underlying_type<int>::type e; // expected-note {{requested here}}
38
39using uint = unsigned;
40enum class foo : uint { bar };
41
42static_assert(is_same_type<underlying_type<foo>::type, unsigned>::value,
43              "foo has the wrong underlying type");
44
45namespace PR19966 {
46  void PR19966(enum Invalid) { // expected-note 2{{forward declaration of}}
47    // expected-error@-1 {{ISO C++ forbids forward references to 'enum'}}
48    // expected-error@-2 {{variable has incomplete type}}
49    __underlying_type(Invalid) dont_crash;
50    // expected-error@-1 {{cannot determine underlying type of incomplete enumeration type 'PR19966::Invalid'}}
51  }
52  enum E { // expected-note {{forward declaration of 'E'}}
53    a = (__underlying_type(E)){}
54    // expected-error@-1 {{cannot determine underlying type of incomplete enumeration type 'PR19966::E'}}
55    // expected-error@-2 {{constant expression}}
56  };
57}
58