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
10
11// <format>
12
13// struct format_to_n_result
14
15// [format.syn]/1
16// The class template format_to_n_result has the template parameters, data
17// members, and special members specified above. It has no base classes or
18// members other than those specified.
19
20#include <format>
21
22#include <cassert>
23#include <concepts>
24#include <iterator>
25
26#include "test_macros.h"
27
28template <class CharT>
29constexpr void test() {
30 std::format_to_n_result<CharT*> v{nullptr, std::iter_difference_t<CharT*>{42}};
31
32 auto [out, size] = v;
33 static_assert(std::same_as<decltype(out), CharT*>);
34 assert(out == v.out);
35 static_assert(std::same_as<decltype(size), std::iter_difference_t<CharT*>>);
36 assert(size == v.size);
37}
38
39constexpr bool test() {
40 test<char>();
41#ifndef TEST_HAS_NO_WIDE_CHARACTERS
42 test<wchar_t>();
43#endif
44 return true;
45}
46
47int main(int, char**) {
48 assert(test());
49 static_assert(test());
50
51 return 0;
52}
53

source code of libcxx/test/std/utilities/format/format.syn/format_to_n_result.pass.cpp