libcxx/test/std/thread/thread.stoptoken/stoptoken/assign.copy.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 #include <cassert>
  15 #include <concepts>
  16 #include <stop_token>
  17 #include <type_traits>
  18
  19 #include "test_macros.h"
  20
  21 static_assert(std::is_nothrow_copy_assignable_v<std::stop_token>);
  22
  23 int main(int, char**) {
  24   {
  25     std::stop_token st1;
  26
  27     std::stop_source source;
  28     auto st2 = source.get_token();
  29
  30     assert(st1 != st2);
  31
  32     source.request_stop();
  33
  34     assert(!st1.stop_requested());
  35     assert(st2.stop_requested());
  36
  37     std::same_as<std::stop_token&> decltype(auto) ref = st1 = st2;
  38     assert(&ref == &st1);
  39
  40     assert(st1 == st2);
  41     assert(st1.stop_requested());
  42     assert(st2.stop_requested());
  43   }
  44
  45   return 0;
  46 }