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 // <iterator>
10
11 // <iterator>
12 // template <class C> constexpr auto empty(const C& c) -> decltype(c.empty());
13
14 // UNSUPPORTED: c++03, c++11, c++14, c++17
15
16 #include <vector>
17 #include <iterator>
18
19 #include "test_macros.h"
20
main(int,char **)21 int main(int, char**)
22 {
23 std::vector<int> c;
24 std::empty(c); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
25
26 return 0;
27 }
28