libcxx/test/std/thread/futures/futures.unique_future/move_assign.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, c++03
  10
  11 // <future>
  12
  13 // class future<R>
  14
  15 // future& operator=(future&& rhs);
  16
  17 #include <future>
  18 #include <cassert>
  19
  20 #include "test_macros.h"
  21
  22 int main(int, char**)
  23 {
  24     {
  25         typedef int T;
  26         std::promise<T> p;
  27         std::future<T> f0 = p.get_future();
  28         std::future<T> f;
  29         f = std::move(f0);
  30         assert(!f0.valid());
  31         assert(f.valid());
  32     }
  33     {
  34         typedef int T;
  35         std::future<T> f0;
  36         std::future<T> f;
  37         f = std::move(f0);
  38         assert(!f0.valid());
  39         assert(!f.valid());
  40     }
  41     {
  42         typedef int& T;
  43         std::promise<T> p;
  44         std::future<T> f0 = p.get_future();
  45         std::future<T> f;
  46         f = std::move(f0);
  47         assert(!f0.valid());
  48         assert(f.valid());
  49     }
  50     {
  51         typedef int& T;
  52         std::future<T> f0;
  53         std::future<T> f;
  54         f = std::move(f0);
  55         assert(!f0.valid());
  56         assert(!f.valid());
  57     }
  58     {
  59         typedef void T;
  60         std::promise<T> p;
  61         std::future<T> f0 = p.get_future();
  62         std::future<T> f;
  63         f = std::move(f0);
  64         assert(!f0.valid());
  65         assert(f.valid());
  66     }
  67     {
  68         typedef void T;
  69         std::future<T> f0;
  70         std::future<T> f;
  71         f = std::move(f0);
  72         assert(!f0.valid());
  73         assert(!f.valid());
  74     }
  75
  76   return 0;
  77 }