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
10
11// <format>
12
13// constexpr begin() const noexcept;
14
15#include <format>
16
17#include <cassert>
18#include <string_view>
19
20#include "test_macros.h"
21
22template <class CharT>
23constexpr void test(const CharT* fmt) {
24 {
25 std::basic_format_parse_context<CharT> context(fmt);
26 assert(std::to_address(context.begin()) == &fmt[0]);
27 ASSERT_NOEXCEPT(context.begin());
28 }
29 {
30 std::basic_string_view view{fmt};
31 std::basic_format_parse_context context(view);
32 assert(context.begin() == view.begin());
33 ASSERT_NOEXCEPT(context.begin());
34 }
35}
36
37constexpr bool test() {
38 test(fmt: "abc");
39#ifndef TEST_HAS_NO_WIDE_CHARACTERS
40 test(fmt: L"abc");
41#endif
42#ifndef TEST_HAS_NO_CHAR8_T
43 test(fmt: u8"abc");
44#endif
45 test(fmt: u"abc");
46 test(fmt: U"abc");
47
48 return true;
49}
50
51int main(int, char**) {
52 test();
53 static_assert(test());
54
55 return 0;
56}
57

source code of libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/begin.pass.cpp