1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 // UNSUPPORTED: c++03
10
11 // check that <utility> functions are marked [[nodiscard]]
12
13 // clang-format off
14
15 #include <utility>
16
17 #include "test_macros.h"
18
test()19 void test() {
20 int i = 0;
21
22 std::forward<int>(i); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
23 std::forward<int>(1); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
24 std::move(i); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
25 std::move_if_noexcept(i); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
26
27 #if TEST_STD_VER >= 17
28 std::as_const(i); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
29 #endif
30
31 #if TEST_STD_VER >= 23
32 enum E { Apple, Orange } e = Apple;
33 std::to_underlying(e); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
34 #endif
35 }
36