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 ParseContext>
22// constexpr typename ParseContext::iterator
23// parse(ParseContext& ctx);
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 <cassert>
29#include <concepts>
30#include <format>
31#include <memory>
32#include <queue>
33#include <stack>
34
35#include "test_macros.h"
36#include "make_string.h"
37
38#define SV(S) MAKE_STRING_VIEW(CharT, S)
39
40template <class Arg, class StringViewT>
41constexpr void test_parse(StringViewT fmt, std::size_t offset) {
42 using CharT = typename StringViewT::value_type;
43 auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
44 std::formatter<Arg, CharT> formatter;
45 static_assert(std::semiregular<decltype(formatter)>);
46
47 std::same_as<typename StringViewT::iterator> auto it = formatter.parse(parse_ctx);
48 // std::to_address works around LWG3989 and MSVC STL's iterator debugging mechanism.
49 assert(std::to_address(it) == std::to_address(fmt.end()) - offset);
50}
51
52template <class StringViewT>
53constexpr void test_parse(StringViewT fmt, std::size_t offset) {
54 test_parse<std::queue<int>>(fmt, offset);
55 test_parse<std::priority_queue<int>>(fmt, offset);
56 test_parse<std::stack<int>>(fmt, offset);
57}
58
59template <class CharT>
60constexpr void test_fmt() {
61 test_parse(SV(""), 0);
62 test_parse(SV(":d"), 0);
63
64 test_parse(SV("}"), 1);
65 test_parse(SV(":d}"), 1);
66}
67
68constexpr bool test() {
69 test_fmt<char>();
70#ifndef TEST_HAS_NO_WIDE_CHARACTERS
71 test_fmt<wchar_t>();
72#endif
73
74 return true;
75}
76
77int main(int, char**) {
78 test();
79 static_assert(test());
80
81 return 0;
82}
83

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