libcxx/test/std/thread/futures/futures.unique_future/dtor.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-exceptions
  10 // UNSUPPORTED: libcpp-has-no-threads
  11 // UNSUPPORTED: c++03
  12
  13 // <future>
  14
  15 // class future<R>
  16
  17 // ~future();
  18
  19 #include <future>
  20 #include <cassert>
  21
  22 #include "test_macros.h"
  23 #include "test_allocator.h"
  24
  25 int main(int, char**)
  26 {
  27     assert(test_alloc_base::alloc_count == 0);
  28     {
  29         typedef int T;
  30         std::future<T> f;
  31         {
  32             std::promise<T> p(std::allocator_arg, test_allocator<T>());
  33             assert(test_alloc_base::alloc_count == 1);
  34             f = p.get_future();
  35             assert(test_alloc_base::alloc_count == 1);
  36             assert(f.valid());
  37         }
  38         assert(test_alloc_base::alloc_count == 1);
  39         assert(f.valid());
  40     }
  41     assert(test_alloc_base::alloc_count == 0);
  42     {
  43         typedef int& T;
  44         std::future<T> f;
  45         {
  46             std::promise<T> p(std::allocator_arg, test_allocator<int>());
  47             assert(test_alloc_base::alloc_count == 1);
  48             f = p.get_future();
  49             assert(test_alloc_base::alloc_count == 1);
  50             assert(f.valid());
  51         }
  52         assert(test_alloc_base::alloc_count == 1);
  53         assert(f.valid());
  54     }
  55     assert(test_alloc_base::alloc_count == 0);
  56     {
  57         typedef void T;
  58         std::future<T> f;
  59         {
  60             std::promise<T> p(std::allocator_arg, test_allocator<T>());
  61             assert(test_alloc_base::alloc_count == 1);
  62             f = p.get_future();
  63             assert(test_alloc_base::alloc_count == 1);
  64             assert(f.valid());
  65         }
  66         assert(test_alloc_base::alloc_count == 1);
  67         assert(f.valid());
  68     }
  69     assert(test_alloc_base::alloc_count == 0);
  70
  71   return 0;
  72 }