libcxx/test/std/thread/futures/futures.task/futures.task.members/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-threads
  10 // UNSUPPORTED: c++03
  11
  12 // <future>
  13
  14 // class packaged_task<R(ArgTypes...)>
  15
  16 // ~packaged_task();
  17
  18 #include <future>
  19 #include <cassert>
  20
  21 #include "make_test_thread.h"
  22 #include "test_macros.h"
  23
  24 class A
  25 {
  26     long data_;
  27
  28 public:
  29     explicit A(long i) : data_(i) {}
  30
  31     long operator()(long i, long j) const {return data_ + i + j;}
  32 };
  33
  34 void func(std::packaged_task<double(int, char)>)
  35 {
  36 }
  37
  38 void func2(std::packaged_task<double(int, char)> p) { p(3, 97); }
  39
  40 int main(int, char**)
  41 {
  42 #ifndef TEST_HAS_NO_EXCEPTIONS
  43     {
  44         std::packaged_task<double(int, char)> p(A(5));
  45         std::future<double> f = p.get_future();
  46         support::make_test_thread(func, std::move(p)).detach();
  47         try
  48         {
  49             double i = f.get();
  50             ((void)i); // Prevent unused warning
  51             assert(false);
  52         }
  53         catch (const std::future_error& e)
  54         {
  55             assert(e.code() == make_error_code(std::future_errc::broken_promise));
  56         }
  57     }
  58 #endif
  59     {
  60         std::packaged_task<double(int, char)> p(A(5));
  61         std::future<double> f = p.get_future();
  62         support::make_test_thread(func2, std::move(p)).detach();
  63         assert(f.get() == 105.0);
  64     }
  65
  66   return 0;
  67 }