libcxx/test/std/thread/thread.stoptoken/stopsource/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: c++03, c++11, c++14, c++17
  11 // XFAIL: availability-synchronization_library-missing
  12
  13 // void swap(stop_source& rhs) noexcept;
  14
  15 #include <cassert>
  16 #include <concepts>
  17 #include <stop_token>
  18 #include <type_traits>
  19
  20 #include "test_macros.h"
  21
  22 template <class T>
  23 concept IsNoThrowFreeSwappable = requires(T& t) {
  24   { swap(t, t) } noexcept;
  25 };
  26
  27 static_assert(IsNoThrowFreeSwappable<std::stop_source>);
  28
  29 int main(int, char**) {
  30   {
  31     std::stop_source ss1;
  32     std::stop_source ss2;
  33
  34     assert(ss1 != ss2);
  35
  36     ss2.request_stop();
  37
  38     assert(!ss1.stop_requested());
  39     assert(ss2.stop_requested());
  40
  41     swap(ss1, ss2);
  42
  43     assert(ss1 != ss2);
  44     assert(ss1.stop_requested());
  45     assert(!ss2.stop_requested());
  46   }
  47
  48   return 0;
  49 }