libcxx/test/std/containers/unord/unord.multiset/empty.fail.cpp

   1 // -*- C++ -*-
   2 //===----------------------------------------------------------------------===//
   3 //
   4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   5 // See https://llvm.org/LICENSE.txt for license information.
   6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 // <unordered_set>
  11
  12 // class unordered_multiset
  13
  14 // bool empty() const noexcept;
  15
  16 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
  17 // UNSUPPORTED: clang-3.3, clang-3.4, clang-3.5, clang-3.6, clang-3.7, clang-3.8
  18
  19 #include <unordered_set>
  20
  21 #include "test_macros.h"
  22
  23 int main(int, char**)
  24 {
  25     std::unordered_multiset<int> c;
  26     c.empty();  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
  27
  28   return 0;
  29 }