libcxx/test/std/thread/futures/futures.future_error/code.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
  11 // <future>
  12 //
  13 // class future_error
  14 //
  15 // const error_code& code() const noexcept;
  16
  17 #include <cassert>
  18 #include <future>
  19 #include <utility>
  20
  21 #include "test_macros.h"
  22
  23 int main(int, char**) {
  24   ASSERT_NOEXCEPT(std::declval<std::future_error const&>().code());
  25   ASSERT_SAME_TYPE(decltype(std::declval<std::future_error const&>().code()), std::error_code const&);
  26
  27   // Before C++17, we can't construct std::future_error directly in a standards-conforming way
  28 #if TEST_STD_VER >= 17
  29   {
  30     std::future_error const f(std::future_errc::broken_promise);
  31     std::error_code const& code = f.code();
  32     assert(code == std::make_error_code(std::future_errc::broken_promise));
  33   }
  34   {
  35     std::future_error const f(std::future_errc::future_already_retrieved);
  36     std::error_code const& code = f.code();
  37     assert(code == std::make_error_code(std::future_errc::future_already_retrieved));
  38   }
  39   {
  40     std::future_error const f(std::future_errc::promise_already_satisfied);
  41     std::error_code const& code = f.code();
  42     assert(code == std::make_error_code(std::future_errc::promise_already_satisfied));
  43   }
  44   {
  45     std::future_error const f(std::future_errc::no_state);
  46     std::error_code const& code = f.code();
  47     assert(code == std::make_error_code(std::future_errc::no_state));
  48   }
  49 #endif
  50
  51   return 0;
  52 }