libcxx/test/std/utilities/charconv/charconv.syn/to_chars_result.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
  10
  11 // <charconv>
  12
  13 // struct to_chars_result
  14 //   friend bool operator==(const to_chars_result&, const to_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 #include <system_error>
  27 #include <type_traits>
  28
  29 #include "test_macros.h"
  30
  31 constexpr bool test() {
  32   std::to_chars_result lhs{nullptr, std::errc{}};
  33 #if TEST_STD_VER > 17
  34   std::to_chars_result rhs{nullptr, std::errc{}};
  35   assert(lhs == rhs);
  36   assert(!(lhs != rhs));
  37 #endif
  38   auto [ptr, ec] = lhs;
  39   static_assert(std::is_same_v<decltype(ptr), char*>);
  40   assert(ptr == lhs.ptr);
  41   static_assert(std::is_same_v<decltype(ec), std::errc>);
  42   assert(ec == lhs.ec);
  43
  44   return true;
  45 }
  46
  47 int main(int, char**) {
  48 #if TEST_STD_VER > 17
  49   static_assert(std::equality_comparable<std::to_chars_result>);
  50   static_assert(!std::totally_ordered<std::to_chars_result>);
  51   static_assert(!std::three_way_comparable<std::to_chars_result>);
  52 #endif
  53
  54   assert(test());
  55   static_assert(test());
  56
  57   return 0;
  58 }