1//===----------------------------------------------------------------------===//
2// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
3// See https://llvm.org/LICENSE.txt for license information.
4// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
5//
6//===----------------------------------------------------------------------===//
7
8// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
9
10// constexpr const T* operator->() const noexcept;
11// constexpr T* operator->() noexcept;
12
13#include <cassert>
14#include <concepts>
15#include <expected>
16#include <type_traits>
17#include <utility>
18
19#include "test_macros.h"
20
21// Test noexcept
22template <class T>
23concept ArrowNoexcept =
24 requires(T t) {
25 { t.operator->() } noexcept;
26 };
27
28static_assert(!ArrowNoexcept<int>);
29
30static_assert(ArrowNoexcept<std::expected<int, int>>);
31static_assert(ArrowNoexcept<const std::expected<int, int>>);
32
33constexpr bool test() {
34 // const
35 {
36 const std::expected<int, int> e(5);
37 std::same_as<const int*> decltype(auto) x = e.operator->();
38 assert(x == &(e.value()));
39 assert(*x == 5);
40 }
41
42 // non-const
43 {
44 std::expected<int, int> e(5);
45 std::same_as<int*> decltype(auto) x = e.operator->();
46 assert(x == &(e.value()));
47 assert(*x == 5);
48 }
49
50 return true;
51}
52
53int main(int, char**) {
54 test();
55 static_assert(test());
56 return 0;
57}
58

source code of libcxx/test/std/utilities/expected/expected.expected/observers/arrow.pass.cpp