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// UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
11
12// <format>
13
14// template<class T, class charT = char>
15// requires same_as<remove_cvref_t<T>, T> && formattable<T, charT>
16// class range_formatter
17
18// template<class ParseContext>
19// constexpr typename ParseContext::iterator
20// parse(ParseContext& ctx);
21
22// Note this tests the basics of this function. It's tested in more detail in
23// the format functions test.
24
25#include <cassert>
26#include <concepts>
27#include <format>
28#include <memory>
29
30#include "test_macros.h"
31#include "make_string.h"
32
33#define SV(S) MAKE_STRING_VIEW(CharT, S)
34
35template <class StringViewT>
36constexpr void test_parse(StringViewT fmt, std::size_t offset) {
37 using CharT = typename StringViewT::value_type;
38 auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
39 std::range_formatter<int, CharT> formatter;
40 static_assert(std::semiregular<decltype(formatter)>);
41
42 std::same_as<typename StringViewT::iterator> auto it = formatter.parse(parse_ctx);
43 // std::to_address works around LWG3989 and MSVC STL's iterator debugging mechanism.
44 assert(std::to_address(it) == std::to_address(fmt.end()) - offset);
45}
46
47template <class CharT>
48constexpr void test_fmt() {
49 test_parse(SV(""), 0);
50 test_parse(SV(":d"), 0);
51
52 test_parse(SV("}"), 1);
53 test_parse(SV(":d}"), 1);
54}
55
56constexpr bool test() {
57 test_fmt<char>();
58#ifndef TEST_HAS_NO_WIDE_CHARACTERS
59 test_fmt<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.formatter/parse.pass.cpp