| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // UNSUPPORTED: c++98, c++03, c++11, C++14, c++17 |
| // type_traits |
| |
| // underlying_type |
| // Mandates: enum must not be an incomplete enumeration type. |
| |
| #include <type_traits> |
| #include <climits> |
| |
| #include "test_macros.h" |
| |
| enum E1 { E1Zero, E1One, E1Two = sizeof(std::underlying_type<E1>::type) }; // expected-error@type_traits:* {{cannot determine underlying type of incomplete enumeration type 'E1'}} |
| |
| // None of these are incomplete. |
| // Scoped enums have an underlying type of 'int' unless otherwise specified |
| // Unscoped enums with a specified underlying type become complete as soon as that type is specified. |
| // enum E2 : char { E2Zero, E2One, E2Two = sizeof(std::underlying_type<E2>::type) }; |
| // enum class E3 { E3Zero, E3One, E3Two = sizeof(std::underlying_type<E3>::type) }; |
| // enum struct E4 : unsigned { E4Zero, E4One, E4Two = sizeof(std::underlying_type<E4>::type) }; |
| // enum struct E5 { E5Zero, E5One, E5Two = sizeof(std::underlying_type<E5>::type) }; |
| // enum class E6 : unsigned { E6Zero, E6One, E6Two = sizeof(std::underlying_type<E6>::type) }; |
| |
| // These error messages will have to change if clang ever gets fixed. But at least they're being rejected. |
| enum E7 : std::underlying_type_t<E7> {}; // expected-error {{use of undeclared identifier 'E7'}} |
| enum class E8 : std::underlying_type_t<E8> {}; // expected-error {{use of undeclared identifier 'E8'}} |
| enum struct E9 : std::underlying_type_t<E9> {}; // expected-error {{use of undeclared identifier 'E9'}} |
| |
| int main(int, char**) |
| { |
| return 0; |
| } |
