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 { 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 {}; 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
