Home | History | Annotate | Download | only in futures.promise 
      1 //===----------------------------------------------------------------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is dual licensed under the MIT and the University of Illinois Open
      6 // Source Licenses. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 //
     10 // UNSUPPORTED: libcpp-has-no-threads
     11 // UNSUPPORTED: c++98, c++03
     12 
     13 // <future>
     14 
     15 // class promise<R>
     16 
     17 // promise& operator=(promise&& rhs);
     18 
     19 #include <future>
     20 #include <cassert>
     21 
     22 #include "test_macros.h"
     23 #include "test_allocator.h"
     24 
     25 int main()
     26 {
     27     assert(test_alloc_base::alloc_count == 0);
     28     {
     29         std::promise<int> p0(std::allocator_arg, test_allocator<int>());
     30         std::promise<int> p(std::allocator_arg, test_allocator<int>());
     31         assert(test_alloc_base::alloc_count == 2);
     32         p = std::move(p0);
     33         assert(test_alloc_base::alloc_count == 1);
     34         std::future<int> f = p.get_future();
     35         assert(test_alloc_base::alloc_count == 1);
     36         assert(f.valid());
     37 #ifndef TEST_HAS_NO_EXCEPTIONS
     38         try
     39         {
     40             f = p0.get_future();
     41             assert(false);
     42         }
     43         catch (const std::future_error& e)
     44         {
     45             assert(e.code() == make_error_code(std::future_errc::no_state));
     46         }
     47 #endif
     48         assert(test_alloc_base::alloc_count == 1);
     49     }
     50     assert(test_alloc_base::alloc_count == 0);
     51     {
     52         std::promise<int&> p0(std::allocator_arg, test_allocator<int>());
     53         std::promise<int&> p(std::allocator_arg, test_allocator<int>());
     54         assert(test_alloc_base::alloc_count == 2);
     55         p = std::move(p0);
     56         assert(test_alloc_base::alloc_count == 1);
     57         std::future<int&> f = p.get_future();
     58         assert(test_alloc_base::alloc_count == 1);
     59         assert(f.valid());
     60 #ifndef TEST_HAS_NO_EXCEPTIONS
     61         try
     62         {
     63             f = p0.get_future();
     64             assert(false);
     65         }
     66         catch (const std::future_error& e)
     67         {
     68             assert(e.code() == make_error_code(std::future_errc::no_state));
     69         }
     70 #endif
     71         assert(test_alloc_base::alloc_count == 1);
     72     }
     73     assert(test_alloc_base::alloc_count == 0);
     74     {
     75         std::promise<void> p0(std::allocator_arg, test_allocator<void>());
     76         std::promise<void> p(std::allocator_arg, test_allocator<void>());
     77         assert(test_alloc_base::alloc_count == 2);
     78         p = std::move(p0);
     79         assert(test_alloc_base::alloc_count == 1);
     80         std::future<void> f = p.get_future();
     81         assert(test_alloc_base::alloc_count == 1);
     82         assert(f.valid());
     83 #ifndef TEST_HAS_NO_EXCEPTIONS
     84         try
     85         {
     86             f = p0.get_future();
     87             assert(false);
     88         }
     89         catch (const std::future_error& e)
     90         {
     91             assert(e.code() == make_error_code(std::future_errc::no_state));
     92         }
     93 #endif
     94         assert(test_alloc_base::alloc_count == 1);
     95     }
     96     assert(test_alloc_base::alloc_count == 0);
     97 }
     98