libcxx/test/std/thread/thread.stoptoken/stoptoken/nodiscard.verify.cpp

   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: no-threads
  10 // UNSUPPORTED: libcpp-has-no-experimental-stop_token
  11 // UNSUPPORTED: c++03, c++11, c++14, c++17
  12 // XFAIL: availability-synchronization_library-missing
  13
  14 //  [[nodiscard]] bool stop_requested() const noexcept;
  15 //  [[nodiscard]] bool stop_possible() const noexcept;
  16 //  [[nodiscard]] friend bool operator==(const stop_token& lhs, const stop_token& rhs) noexcept;
  17
  18 #include <stop_token>
  19
  20 void test() {
  21   std::stop_token st;
  22   st.stop_requested(); // expected-warning {{ignoring return value of function}}
  23   st.stop_possible();  // expected-warning {{ignoring return value of function}}
  24   operator==(st, st);  // expected-warning {{ignoring return value of function}}
  25 }