libcxx/test/std/thread/thread.stoptoken/stoptoken/swap.free.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 // friend void swap(stop_token& x, stop_token& y) noexcept;
  15
  16 #include <cassert>
  17 #include <concepts>
  18 #include <stop_token>
  19 #include <type_traits>
  20
  21 #include "test_macros.h"
  22
  23 template <class T>
  24 concept IsNoThrowFreeSwappable = requires(T& t) {
  25   { swap(t, t) } noexcept;
  26 };
  27
  28 static_assert(IsNoThrowFreeSwappable<std::stop_token>);
  29
  30 int main(int, char**) {
  31   {
  32     std::stop_token st1;
  33
  34     std::stop_source source;
  35     auto st2 = source.get_token();
  36
  37     assert(st1 != st2);
  38
  39     source.request_stop();
  40
  41     assert(!st1.stop_requested());
  42     assert(st2.stop_requested());
  43
  44     swap(st1, st2);
  45
  46     assert(st1 != st2);
  47     assert(st1.stop_requested());
  48     assert(!st2.stop_requested());
  49   }
  50
  51   return 0;
  52 }