libcxx/test/std/thread/futures/futures.unique_future/move_ctor.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(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 = std::move(f0);
  29         assert(!f0.valid());
  30         assert(f.valid());
  31     }
  32     {
  33         typedef int T;
  34         std::future<T> f0;
  35         std::future<T> f = std::move(f0);
  36         assert(!f0.valid());
  37         assert(!f.valid());
  38     }
  39     {
  40         typedef int& T;
  41         std::promise<T> p;
  42         std::future<T> f0 = p.get_future();
  43         std::future<T> f = std::move(f0);
  44         assert(!f0.valid());
  45         assert(f.valid());
  46     }
  47     {
  48         typedef int& T;
  49         std::future<T> f0;
  50         std::future<T> f = std::move(f0);
  51         assert(!f0.valid());
  52         assert(!f.valid());
  53     }
  54     {
  55         typedef void T;
  56         std::promise<T> p;
  57         std::future<T> f0 = p.get_future();
  58         std::future<T> f = std::move(f0);
  59         assert(!f0.valid());
  60         assert(f.valid());
  61     }
  62     {
  63         typedef void T;
  64         std::future<T> f0;
  65         std::future<T> f = std::move(f0);
  66         assert(!f0.valid());
  67         assert(!f.valid());
  68     }
  69
  70   return 0;
  71 }