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// <format>
12
13// template<ranges::input_range R, class charT>
14// requires (K == range_format::string || K == range_format::debug_string)
15// struct range-default-formatter<K, R, charT>
16
17// template<class ParseContext>
18// constexpr typename ParseContext::iterator
19// parse(ParseContext& ctx);
20
21// Note this tests the basics of this function. It's tested in more detail in
22// the format.functions test.
23
24#include <cassert>
25#include <concepts>
26#include <format>
27#include <memory>
28
29#include "format.functions.tests.h"
30#include "test_macros.h"
31
32template <class FormatterT, class StringViewT>
33constexpr void test_parse(StringViewT fmt, std::size_t offset) {
34 using CharT = typename StringViewT::value_type;
35 auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
36 FormatterT formatter;
37 static_assert(std::semiregular<decltype(formatter)>);
38
39 std::same_as<typename StringViewT::iterator> auto it = formatter.parse(parse_ctx);
40 // std::to_address works around LWG3989 and MSVC STL's iterator debugging mechanism.
41 assert(std::to_address(it) == std::to_address(fmt.end()) - offset);
42}
43
44template <class StringViewT>
45constexpr void test_formatters(StringViewT fmt, std::size_t offset) {
46 using CharT = typename StringViewT::value_type;
47 test_parse<std::formatter<test_range_format_string<std::basic_string<CharT>>, CharT>>(fmt, offset);
48 test_parse<std::formatter<test_range_format_debug_string<std::basic_string<CharT>>, CharT>>(fmt, offset);
49}
50
51template <class CharT>
52constexpr void test_char_type() {
53 test_formatters(SV(""), 0);
54 test_formatters(SV("}"), 1);
55}
56
57constexpr bool test() {
58 test_char_type<char>();
59#ifndef TEST_HAS_NO_WIDE_CHARACTERS
60 test_char_type<wchar_t>();
61#endif
62
63 return true;
64}
65
66int main(int, char**) {
67 test();
68 static_assert(test());
69
70 return 0;
71}
72

source code of libcxx/test/std/utilities/format/format.range/format.range.fmtstr/parse.pass.cpp