libcxx/test/std/thread/thread.jthread/get_id.pass.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: c++03, c++11, c++14, c++17
  11 // XFAIL: availability-synchronization_library-missing
  12
  13 // [[nodiscard]] id get_id() const noexcept;
  14
  15 #include <cassert>
  16 #include <concepts>
  17 #include <thread>
  18 #include <type_traits>
  19
  20 #include "make_test_thread.h"
  21 #include "test_macros.h"
  22
  23 static_assert(noexcept(std::declval<const std::jthread&>().get_id()));
  24
  25 int main(int, char**) {
  26   // Does not represent a thread
  27   {
  28     const std::jthread jt;
  29     std::same_as<std::jthread::id> decltype(auto) result = jt.get_id();
  30     assert(result == std::jthread::id());
  31   }
  32
  33   // Represents a thread
  34   {
  35     const std::jthread jt                                = support::make_test_jthread([] {});
  36     std::same_as<std::jthread::id> decltype(auto) result = jt.get_id();
  37     assert(result != std::jthread::id());
  38   }
  39
  40   return 0;
  41 }