1 // RUN: %clang_cc1 -triple %itanium_abi_triple -ffreestanding -fsyntax-only -verify -std=c++11 %s
2
3 #include "limits.h"
4
5 template<typename T, typename U>
6 struct is_same_type {
7 static const bool value = false;
8 };
9 template <typename T>
10 struct 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
17 enum class f : char;
18 static_assert(is_same_type<char, __underlying_type(f)>::value,
19 "f has the wrong underlying type");
20
21 enum g {d = INT_MIN };
22 static_assert(is_same_type<int, __underlying_type(g)>::value,
23 "g has the wrong underlying type");
24
25 __underlying_type(f) h;
26 static_assert(is_same_type<char, decltype(h)>::value,
27 "h has the wrong type");
28
29 template <typename T>
30 struct underlying_type {
31 typedef __underlying_type(T) type; // expected-error {{only enumeration types}}
32 };
33
34 static_assert(is_same_type<underlying_type<f>::type, char>::value,
35 "f has the wrong underlying type in the template");
36
37 underlying_type<int>::type e; // expected-note {{requested here}}
38
39 using uint = unsigned;
40 enum class foo : uint { bar };
41
42 static_assert(is_same_type<underlying_type<foo>::type, unsigned>::value,
43 "foo has the wrong underlying type");
44
45 namespace PR19966 {
PR19966(enum Invalid)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
59 template<typename T> void f(__underlying_type(T));
60 template<typename T> void f(__underlying_type(T));
61 enum E {};
PR26014()62 void PR26014() { f<E>(0); } // should not yield an ambiguity error.
63
64 template<typename ...T> void f(__underlying_type(T) v); // expected-error {{declaration type contains unexpanded parameter pack 'T'}}
65
66 namespace PR23421 {
67 template <class T>
68 using underlying_type_t = __underlying_type(T);
69 // Should not crash.
70 template <class T>
71 struct make_unsigned_impl { using type = underlying_type_t<T>; };
72 using AnotherType = make_unsigned_impl<E>::type;
73
74 // also should not crash.
75 template <typename T>
76 __underlying_type(T) ft();
77 auto x = &ft<E>;
78 }
79