1//===----------------------------------------------------------------------===//
2// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
3// See https://llvm.org/LICENSE.txt for license information.
4// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
5//
6//===----------------------------------------------------------------------===//
7
8// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
9
10// UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
11
12// <format>
13
14// template<class charT, formattable<charT>... Ts>
15// struct formatter<pair-or-tuple<Ts...>, charT>
16
17// template<class FormatContext>
18// typename FormatContext::iterator
19// format(see below& elems, FormatContext& ctx) const;
20
21// Note this tests the basics of this function. It's tested in more detail in
22// the format functions tests.
23
24#include <cassert>
25#include <concepts>
26#include <format>
27#include <iterator>
28#include <tuple>
29#include <utility>
30
31#include "assert_macros.h"
32#include "format.functions.common.h"
33#include "make_string.h"
34#include "test_format_context.h"
35#include "test_macros.h"
36
37#define SV(S) MAKE_STRING_VIEW(CharT, S)
38
39template <class StringViewT, class Arg>
40void test(StringViewT expected, Arg arg) {
41 using CharT = typename StringViewT::value_type;
42 using String = std::basic_string<CharT>;
43 using OutIt = std::back_insert_iterator<String>;
44 using FormatCtxT = std::basic_format_context<OutIt, CharT>;
45
46 const std::formatter<Arg, CharT> formatter;
47
48 String result;
49 OutIt out = std::back_inserter(result);
50 FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
51 formatter.format(arg, format_ctx);
52 assert(result == expected);
53}
54
55template <class CharT>
56void test_assure_parse_is_called(std::basic_string_view<CharT> fmt) {
57 using String = std::basic_string<CharT>;
58 using OutIt = std::back_insert_iterator<String>;
59 using FormatCtxT = std::basic_format_context<OutIt, CharT>;
60 std::pair<parse_call_validator, parse_call_validator> arg;
61
62 String result;
63 OutIt out = std::back_inserter(result);
64 FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
65
66 std::formatter<decltype(arg), CharT> formatter;
67 std::basic_format_parse_context<CharT> ctx{fmt};
68
69 formatter.parse(ctx);
70 formatter.format(arg, format_ctx);
71}
72
73template <class CharT>
74void test_assure_parse_is_called() {
75 using String = std::basic_string<CharT>;
76 using OutIt = std::back_insert_iterator<String>;
77 using FormatCtxT = std::basic_format_context<OutIt, CharT>;
78 std::pair<parse_call_validator, parse_call_validator> arg;
79
80 String result;
81 OutIt out = std::back_inserter(result);
82 [[maybe_unused]] FormatCtxT format_ctx =
83 test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
84
85 { // parse not called
86 [[maybe_unused]] const std::formatter<decltype(arg), CharT> formatter;
87 TEST_THROWS_TYPE(parse_call_validator::parse_function_not_called, formatter.format(arg, format_ctx));
88 }
89
90 test_assure_parse_is_called(SV("5"));
91 test_assure_parse_is_called(SV("n"));
92 test_assure_parse_is_called(SV("m"));
93 test_assure_parse_is_called(SV("5n"));
94 test_assure_parse_is_called(SV("5m"));
95}
96
97template <class CharT>
98void test() {
99 test(SV("(1)"), std::tuple<int>{1});
100 test(SV("(1, 1)"), std::tuple<int, CharT>{1, CharT('1')});
101 test(SV("(1, 1)"), std::pair<int, CharT>{1, CharT('1')});
102 test(SV("(1, 1, true)"), std::tuple<int, CharT, bool>{1, CharT('1'), true});
103
104 test_assure_parse_is_called<CharT>();
105}
106
107void test() {
108 test<char>();
109#ifndef TEST_HAS_NO_WIDE_CHARACTERS
110 test<wchar_t>();
111#endif
112}
113
114int main(int, char**) {
115 test();
116
117 return 0;
118}
119

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