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// [container.adaptors.format]
14// For each of queue, priority_queue, and stack, the library provides the
15// following formatter specialization where adaptor-type is the name of the
16// template:
17//
18// template<class charT, class T, formattable<charT> Container, class... U>
19// struct formatter<adaptor-type<T, Container, U...>, charT>
20
21// template<class FormatContext>
22// typename FormatContext::iterator
23// format(maybe-const-adaptor& r, FormatContext& ctx) const;
24
25// Note this tests the basics of this function. It's tested in more detail in
26// the format functions test.
27
28#include <array>
29#include <cassert>
30#include <concepts>
31#include <format>
32#include <queue>
33#include <stack>
34
35#include "test_format_context.h"
36#include "test_macros.h"
37#include "make_string.h"
38
39#define SV(S) MAKE_STRING_VIEW(CharT, S)
40
41template <class StringViewT, class Arg>
42void test_format(StringViewT expected, Arg arg) {
43 using CharT = typename StringViewT::value_type;
44 using String = std::basic_string<CharT>;
45 using OutIt = std::back_insert_iterator<String>;
46 using FormatCtxT = std::basic_format_context<OutIt, CharT>;
47
48 const std::formatter<Arg, CharT> formatter;
49
50 String result;
51 OutIt out = std::back_inserter(result);
52 FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
53 formatter.format(arg, format_ctx);
54 assert(result == expected);
55}
56
57template <class CharT>
58void test_fmt() {
59 std::array input{1, 42, 99, 0};
60 test_format(SV("[1, 42, 99, 0]"), std::queue<int>{input.begin(), input.end()});
61 test_format(SV("[99, 42, 1, 0]"), std::priority_queue<int>{input.begin(), input.end()});
62 test_format(SV("[1, 42, 99, 0]"), std::stack<int>{input.begin(), input.end()});
63}
64
65void test() {
66 test_fmt<char>();
67#ifndef TEST_HAS_NO_WIDE_CHARACTERS
68 test_fmt<wchar_t>();
69#endif
70}
71
72int main(int, char**) {
73 test();
74
75 return 0;
76}
77

source code of libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.pass.cpp