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