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 FormatContext>
19// typename FormatContext::iterator
20// format(see below& elems, FormatContext& ctx) const;
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 <iterator>
29#include <tuple>
30#include <utility>
31
32#include "assert_macros.h"
33#include "format.functions.common.h"
34#include "make_string.h"
35#include "test_format_context.h"
36#include "test_macros.h"
37
38#define SV(S) MAKE_STRING_VIEW(CharT, S)
39
40template <class StringViewT, class Arg>
41void test(StringViewT expected, Arg arg) {
42 using CharT = typename StringViewT::value_type;
43 using String = std::basic_string<CharT>;
44 using OutIt = std::back_insert_iterator<String>;
45 using FormatCtxT = std::basic_format_context<OutIt, CharT>;
46
47 const std::formatter<Arg, CharT> formatter;
48
49 String result;
50 OutIt out = std::back_inserter(result);
51 FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
52 formatter.format(arg, format_ctx);
53 assert(result == expected);
54}
55
56template <class CharT>
57void test_assure_parse_is_called(std::basic_string_view<CharT> fmt) {
58 using String = std::basic_string<CharT>;
59 using OutIt = std::back_insert_iterator<String>;
60 using FormatCtxT = std::basic_format_context<OutIt, CharT>;
61 std::pair<parse_call_validator, parse_call_validator> arg;
62
63 String result;
64 OutIt out = std::back_inserter(result);
65 FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
66
67 std::formatter<decltype(arg), CharT> formatter;
68 std::basic_format_parse_context<CharT> ctx{fmt};
69
70 formatter.parse(ctx);
71 formatter.format(arg, format_ctx);
72}
73
74template <class CharT>
75void test_assure_parse_is_called() {
76 using String = std::basic_string<CharT>;
77 using OutIt = std::back_insert_iterator<String>;
78 using FormatCtxT = std::basic_format_context<OutIt, CharT>;
79 std::pair<parse_call_validator, parse_call_validator> arg;
80
81 String result;
82 OutIt out = std::back_inserter(result);
83 [[maybe_unused]] FormatCtxT format_ctx =
84 test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
85
86 { // parse not called
87 [[maybe_unused]] const std::formatter<decltype(arg), CharT> formatter;
88 TEST_THROWS_TYPE(parse_call_validator::parse_function_not_called, formatter.format(arg, format_ctx));
89 }
90
91 test_assure_parse_is_called(SV("5"));
92 test_assure_parse_is_called(SV("n"));
93 test_assure_parse_is_called(SV("m"));
94 test_assure_parse_is_called(SV("5n"));
95 test_assure_parse_is_called(SV("5m"));
96}
97
98template <class CharT>
99void test() {
100 test(SV("(1)"), std::tuple<int>{1});
101 test(SV("(1, 1)"), std::tuple<int, CharT>{1, CharT('1')});
102 test(SV("(1, 1)"), std::pair<int, CharT>{1, CharT('1')});
103 test(SV("(1, 1, true)"), std::tuple<int, CharT, bool>{1, CharT('1'), true});
104
105 test_assure_parse_is_called<CharT>();
106}
107
108void test() {
109 test<char>();
110#ifndef TEST_HAS_NO_WIDE_CHARACTERS
111 test<wchar_t>();
112#endif
113}
114
115int main(int, char**) {
116 test();
117
118 return 0;
119}
120

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