libcxx/test/std/utilities/expected/expected.void/ctor/ctor.inplace.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: c++03, c++11, c++14, c++17, c++20
  10
  11 // constexpr explicit expected(in_place_t) noexcept;
  12
  13 #include <cassert>
  14 #include <expected>
  15 #include <type_traits>
  16 #include <utility>
  17
  18 // test explicit
  19 static_assert(std::is_constructible_v<std::expected<void, int>, std::in_place_t>);
  20 static_assert(!std::is_convertible_v<std::in_place_t, std::expected<void, int>>);
  21
  22 // test noexcept
  23 static_assert(std::is_nothrow_constructible_v<std::expected<void, int>, std::in_place_t>);
  24
  25 constexpr bool test() {
  26   std::expected<void, int> e(std::in_place);
  27   assert(e.has_value());
  28
  29   return true;
  30 }
  31
  32 int main(int, char**) {
  33   test();
  34   static_assert(test());
  35   return 0;
  36 }