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// <vector>
13
14// template<class T, class charT>
15// requires is-vector-bool-reference<T>
16// struct formatter<T, charT>
17
18// template<class FormatContext>
19// typename FormatContext::iterator
20// format(const T& r, FormatContext& ctx) const;
21
22// Note this tests the basics of this function. It's tested in more detail in
23// the format functions test.
24
25#include <cassert>
26#include <concepts>
27#include <format>
28#include <iterator>
29#include <vector>
30
31#include "test_format_context.h"
32#include "test_macros.h"
33#include "make_string.h"
34
35#define SV(S) MAKE_STRING_VIEW(CharT, S)
36
37template <class StringViewT>
38void test_format(StringViewT expected, std::vector<bool>::reference arg) {
39 using CharT = typename StringViewT::value_type;
40 using String = std::basic_string<CharT>;
41 using OutIt = std::back_insert_iterator<String>;
42 using FormatCtxT = std::basic_format_context<OutIt, CharT>;
43
44 const std::formatter<std::vector<bool>::reference, CharT> formatter;
45
46 String result;
47 OutIt out = std::back_inserter(result);
48 FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
49 formatter.format(arg, format_ctx);
50 assert(result == expected);
51}
52
53template <class CharT>
54void test_fmt() {
55 test_format(SV("true"), std::vector<bool>{true}[0]);
56 test_format(SV("false"), std::vector<bool>{false}[0]);
57}
58
59void test() {
60 test_fmt<char>();
61#ifndef TEST_HAS_NO_WIDE_CHARACTERS
62 test_fmt<wchar_t>();
63#endif
64}
65
66int main(int, char**) {
67 test();
68
69 return 0;
70}
71

source code of libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.pass.cpp