libcxx/test/std/thread/futures/futures.promise/set_value_const.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 promise<R>
  15
  16 // void promise::set_value(const R& r);
  17
  18 #include <future>
  19 #include <cassert>
  20
  21 #include "test_macros.h"
  22
  23 struct A
  24 {
  25     A() {}
  26     A(const A&) {
  27         TEST_THROW(10);
  28     }
  29 };
  30
  31 int main(int, char**)
  32 {
  33     {
  34         typedef int T;
  35         T i = 3;
  36         std::promise<T> p;
  37         std::future<T> f = p.get_future();
  38         p.set_value(i);
  39         ++i;
  40         assert(f.get() == 3);
  41 #ifndef TEST_HAS_NO_EXCEPTIONS
  42         --i;
  43         try
  44         {
  45             p.set_value(i);
  46             assert(false);
  47         }
  48         catch (const std::future_error& e)
  49         {
  50             assert(e.code() == make_error_code(std::future_errc::promise_already_satisfied));
  51         }
  52 #endif
  53     }
  54     {
  55         typedef A T;
  56         T i;
  57         std::promise<T> p;
  58         std::future<T> f = p.get_future();
  59 #ifndef TEST_HAS_NO_EXCEPTIONS
  60         try
  61         {
  62             p.set_value(i);
  63             assert(false);
  64         }
  65         catch (int j)
  66         {
  67             assert(j == 10);
  68         }
  69 #endif
  70     }
  71
  72   return 0;
  73 }