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// UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
12
13// <format>
14
15// template<class charT, formattable<charT>... Ts>
16// struct formatter<pair-or-tuple<Ts...>, charT>
17
18// template<class ParseContext>
19// constexpr typename ParseContext::iterator
20// parse(ParseContext& ctx);
21
22// Note this tests the basics of this function. It's tested in more detail in
23// the format functions tests.
24
25#include <cassert>
26#include <concepts>
27#include <format>
28#include <memory>
29#include <tuple>
30#include <utility>
31
32#include "test_macros.h"
33#include "make_string.h"
34
35#define SV(S) MAKE_STRING_VIEW(CharT, S)
36
37template <class Arg, class StringViewT>
38constexpr void test(StringViewT fmt, std::size_t offset) {
39 using CharT = typename StringViewT::value_type;
40 auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
41 std::formatter<Arg, CharT> formatter;
42 static_assert(std::semiregular<decltype(formatter)>);
43
44 std::same_as<typename StringViewT::iterator> auto it = formatter.parse(parse_ctx);
45 // std::to_address works around LWG3989 and MSVC STL's iterator debugging mechanism.
46 assert(std::to_address(it) == std::to_address(fmt.end()) - offset);
47}
48
49template <class CharT, class Arg>
50constexpr void test() {
51 test<Arg>(SV(""), 0);
52 test<Arg>(SV("42"), 0);
53
54 test<Arg>(SV("}"), 1);
55 test<Arg>(SV("42}"), 1);
56}
57
58template <class CharT>
59constexpr void test() {
60 test<CharT, std::tuple<int>>();
61 test<CharT, std::tuple<int, CharT>>();
62 test<CharT, std::pair<int, CharT>>();
63 test<CharT, std::tuple<int, CharT, bool>>();
64}
65
66constexpr bool test() {
67 test<char>();
68#ifndef TEST_HAS_NO_WIDE_CHARACTERS
69 test<wchar_t>();
70#endif
71
72 return true;
73}
74
75int main(int, char**) {
76 test();
77 static_assert(test());
78
79 return 0;
80}
81

source code of libcxx/test/std/utilities/format/format.tuple/parse.pass.cpp