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// <format>
14
15// template<class T, class charT = char>
16// requires same_as<remove_cvref_t<T>, T> && formattable<T, charT>
17// class range_formatter
18
19// template<class ParseContext>
20// constexpr typename ParseContext::iterator
21// parse(ParseContext& ctx);
22
23// Note this tests the basics of this function. It's tested in more detail in
24// the format functions test.
25
26#include <cassert>
27#include <concepts>
28#include <format>
29#include <memory>
30
31#include "test_macros.h"
32#include "make_string.h"
33
34#define SV(S) MAKE_STRING_VIEW(CharT, S)
35
36template <class StringViewT>
37constexpr void test_parse(StringViewT fmt, std::size_t offset) {
38 using CharT = typename StringViewT::value_type;
39 auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
40 std::range_formatter<int, CharT> formatter;
41 static_assert(std::semiregular<decltype(formatter)>);
42
43 std::same_as<typename StringViewT::iterator> auto it = formatter.parse(parse_ctx);
44 // std::to_address works around LWG3989 and MSVC STL's iterator debugging mechanism.
45 assert(std::to_address(it) == std::to_address(fmt.end()) - offset);
46}
47
48template <class CharT>
49constexpr void test_fmt() {
50 test_parse(SV(""), 0);
51 test_parse(SV(":d"), 0);
52
53 test_parse(SV("}"), 1);
54 test_parse(SV(":d}"), 1);
55}
56
57constexpr bool test() {
58 test_fmt<char>();
59#ifndef TEST_HAS_NO_WIDE_CHARACTERS
60 test_fmt<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.formatter/parse.pass.cpp