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
10 
11 // <charconv>
12 
13 // struct from_chars_result
14 //   friend bool operator==(const from_chars_result&, const from_chars_result&) = default;
15 
16 // [charconv.syn]/2
17 // The types to_chars_result and from_chars_result have the data members and
18 // special members specified above. They have no base classes or members other
19 // than those specified.
20 
21 #include <charconv>
22 
23 #include <cassert>
24 #include <compare>
25 #include <concepts>
26 
27 #include "test_macros.h"
28 
29 constexpr bool test() {
30   std::from_chars_result lhs{nullptr, std::errc{}};
31 #if TEST_STD_VER > 17
32   std::from_chars_result rhs{nullptr, std::errc{}};
33   assert(lhs == rhs);
34   assert(!(lhs != rhs));
35 #endif
36   auto [ptr, ec] = lhs;
37   static_assert(std::is_same_v<decltype(ptr), const char*>);
38   assert(ptr == lhs.ptr);
39   static_assert(std::is_same_v<decltype(ec), std::errc>);
40   assert(ec == lhs.ec);
41 
42   return true;
43 }
44 
45 int main(int, char**) {
46 #if TEST_STD_VER > 17
47   static_assert(std::equality_comparable<std::from_chars_result>);
48   static_assert(!std::totally_ordered<std::from_chars_result>);
49   static_assert(!std::three_way_comparable<std::from_chars_result>);
50 #endif
51 
52   assert(test());
53   static_assert(test());
54 
55   return 0;
56 }
57