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// <format>
11
12// template<ranges::input_range R, class charT>
13// requires (K == range_format::string || K == range_format::debug_string)
14// struct range-default-formatter<K, R, charT>
15
16// template<class ParseContext>
17// constexpr typename ParseContext::iterator
18// parse(ParseContext& ctx);
19
20// Note this tests the basics of this function. It's tested in more detail in
21// the format.functions test.
22
23#include <cassert>
24#include <concepts>
25#include <format>
26#include <memory>
27
28#include "format.functions.tests.h"
29#include "test_macros.h"
30
31template <class FormatterT, class StringViewT>
32constexpr void test_parse(StringViewT fmt, std::size_t offset) {
33 using CharT = typename StringViewT::value_type;
34 auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
35 FormatterT formatter;
36 static_assert(std::semiregular<decltype(formatter)>);
37
38 std::same_as<typename StringViewT::iterator> auto it = formatter.parse(parse_ctx);
39 // std::to_address works around LWG3989 and MSVC STL's iterator debugging mechanism.
40 assert(std::to_address(it) == std::to_address(fmt.end()) - offset);
41}
42
43template <class StringViewT>
44constexpr void test_formatters(StringViewT fmt, std::size_t offset) {
45 using CharT = typename StringViewT::value_type;
46 test_parse<std::formatter<test_range_format_string<std::basic_string<CharT>>, CharT>>(fmt, offset);
47 test_parse<std::formatter<test_range_format_debug_string<std::basic_string<CharT>>, CharT>>(fmt, offset);
48}
49
50template <class CharT>
51constexpr void test_char_type() {
52 test_formatters(SV(""), 0);
53 test_formatters(SV("}"), 1);
54}
55
56constexpr bool test() {
57 test_char_type<char>();
58#ifndef TEST_HAS_NO_WIDE_CHARACTERS
59 test_char_type<wchar_t>();
60#endif
61
62 return true;
63}
64
65int main(int, char**) {
66 test();
67 static_assert(test());
68
69 return 0;
70}
71

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