libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.assign/move.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
  11 // <thread>
  12
  13 // class thread
  14
  15 // thread& operator=(thread&& t);
  16
  17 #include <thread>
  18 #include <cassert>
  19 #include <utility>
  20
  21 #include "make_test_thread.h"
  22 #include "test_macros.h"
  23
  24 class G
  25 {
  26     int alive_;
  27 public:
  28     static int n_alive;
  29     static bool op_run;
  30
  31     G() : alive_(1) {++n_alive;}
  32     G(const G& g) : alive_(g.alive_) {++n_alive;}
  33     ~G() {alive_ = 0; --n_alive;}
  34
  35     void operator()()
  36     {
  37         assert(alive_ == 1);
  38         assert(n_alive >= 1);
  39         op_run = true;
  40     }
  41 };
  42
  43 int G::n_alive = 0;
  44 bool G::op_run = false;
  45
  46 int main(int, char**)
  47 {
  48     assert(G::n_alive == 0);
  49     assert(!G::op_run);
  50     {
  51         G g;
  52         assert(G::n_alive == 1);
  53         assert(!G::op_run);
  54
  55         std::thread t0 = support::make_test_thread(g);
  56         std::thread::id id = t0.get_id();
  57
  58         std::thread t1;
  59         t1 = std::move(t0);
  60         assert(t1.get_id() == id);
  61         assert(t0.get_id() == std::thread::id());
  62
  63         t1.join();
  64         assert(G::n_alive == 1);
  65         assert(G::op_run);
  66     }
  67     assert(G::n_alive == 0);
  68     assert(G::op_run);
  69
  70     return 0;
  71 }