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: 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]] id get_id() const noexcept;
  15
  16 #include <cassert>
  17 #include <concepts>
  18 #include <thread>
  19 #include <type_traits>
  20
  21 #include "make_test_thread.h"
  22 #include "test_macros.h"
  23
  24 static_assert(noexcept(std::declval<const std::jthread&>().get_id()));
  25
  26 int main(int, char**) {
  27   // Does not represent a thread
  28   {
  29     const std::jthread jt;
  30     std::same_as<std::jthread::id> decltype(auto) result = jt.get_id();
  31     assert(result == std::jthread::id());
  32   }
  33
  34   // Represents a thread
  35   {
  36     const std::jthread jt                                = support::make_test_jthread([] {});
  37     std::same_as<std::jthread::id> decltype(auto) result = jt.get_id();
  38     assert(result != std::jthread::id());
  39   }
  40
  41   return 0;
  42 }