libcxx/test/std/thread/thread.stoptoken/stopsource/move.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: c++03, c++11, c++14, c++17
  11 // XFAIL: availability-synchronization_library-missing
  12
  13 // stop_source& operator=(stop_source&& rhs) noexcept;
  14
  15 #include <cassert>
  16 #include <concepts>
  17 #include <stop_token>
  18 #include <type_traits>
  19 #include <utility>
  20
  21 #include "test_macros.h"
  22
  23 static_assert(std::is_nothrow_move_assignable_v<std::stop_source>);
  24
  25 int main(int, char**) {
  26   // have two different states
  27   {
  28     std::stop_source ss1;
  29     std::stop_source ss2;
  30
  31     assert(ss1 != ss2);
  32
  33     ss2.request_stop();
  34
  35     assert(!ss1.stop_requested());
  36     assert(ss2.stop_requested());
  37
  38     std::same_as<std::stop_source&> decltype(auto) ref = ss1 = std::move(ss2);
  39     assert(&ref == &ss1);
  40
  41     assert(ss1.stop_requested());
  42     assert(!ss2.stop_possible());
  43     assert(!ss2.stop_requested());
  44   }
  45
  46   // this has no state
  47   {
  48     std::stop_source ss1{std::nostopstate};
  49     std::stop_source ss2;
  50
  51     assert(ss1 != ss2);
  52
  53     ss2.request_stop();
  54
  55     assert(!ss1.stop_requested());
  56     assert(!ss1.stop_possible());
  57     assert(ss2.stop_requested());
  58     assert(ss2.stop_possible());
  59
  60     std::same_as<std::stop_source&> decltype(auto) ref = ss1 = std::move(ss2);
  61     assert(&ref == &ss1);
  62
  63     assert(ss1.stop_requested());
  64     assert(ss1.stop_possible());
  65     assert(!ss2.stop_requested());
  66     assert(!ss2.stop_possible());
  67   }
  68
  69   // other has no state
  70   {
  71     std::stop_source ss1;
  72     std::stop_source ss2{std::nostopstate};
  73
  74     assert(ss1 != ss2);
  75
  76     ss1.request_stop();
  77
  78     assert(ss1.stop_requested());
  79     assert(ss1.stop_possible());
  80     assert(!ss2.stop_requested());
  81     assert(!ss2.stop_possible());
  82
  83     std::same_as<std::stop_source&> decltype(auto) ref = ss1 = std::move(ss2);
  84     assert(&ref == &ss1);
  85
  86     assert(ss1 == ss2);
  87     assert(!ss1.stop_requested());
  88     assert(!ss1.stop_possible());
  89     assert(!ss2.stop_requested());
  90     assert(!ss2.stop_possible());
  91   }
  92
  93   // both no state
  94   {
  95     std::stop_source ss1{std::nostopstate};
  96     std::stop_source ss2{std::nostopstate};
  97
  98     assert(ss1 == ss2);
  99
 100     assert(!ss1.stop_requested());
 101     assert(!ss1.stop_possible());
 102     assert(!ss2.stop_requested());
 103     assert(!ss2.stop_possible());
 104
 105     std::same_as<std::stop_source&> decltype(auto) ref = ss1 = std::move(ss2);
 106     assert(&ref == &ss1);
 107
 108     assert(ss1 == ss2);
 109     assert(!ss1.stop_requested());
 110     assert(!ss1.stop_possible());
 111     assert(!ss2.stop_requested());
 112     assert(!ss2.stop_possible());
 113   }
 114
 115   // self assignment
 116   {
 117     std::stop_source ss;
 118     auto& self = ss;
 119
 120     assert(!ss.stop_requested());
 121
 122     std::same_as<std::stop_source&> decltype(auto) ref = ss = std::move(self);
 123     assert(&ref == &ss);
 124
 125     assert(!ss.stop_requested());
 126
 127     ss.request_stop();
 128     assert(ss.stop_requested());
 129   }
 130
 131   return 0;
 132 }