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 explicit
14// basic_format_parse_context(basic_string_view<charT> fmt,
15// size_t num_args = 0) noexcept
16
17#include <format>
18
19#include <cassert>
20#include <string_view>
21#include <type_traits>
22
23#include "test_macros.h"
24
25template <class CharT>
26constexpr void test(const CharT* fmt) {
27 // Validate the constructor is explicit.
28 static_assert(
29 !std::is_convertible_v<std::basic_string_view<CharT>,
30 std::basic_format_parse_context<CharT> >);
31 static_assert(
32 !std::is_copy_constructible_v<std::basic_format_parse_context<CharT> >);
33 static_assert(
34 !std::is_copy_assignable_v<std::basic_format_parse_context<CharT> >);
35 // The move operations are implicitly deleted due to the
36 // deleted copy operations.
37 static_assert(
38 !std::is_move_constructible_v<std::basic_format_parse_context<CharT> >);
39 static_assert(
40 !std::is_move_assignable_v<std::basic_format_parse_context<CharT> >);
41
42 ASSERT_NOEXCEPT(std::basic_format_parse_context{std::basic_string_view<CharT>{}});
43 ASSERT_NOEXCEPT(std::basic_format_parse_context{std::basic_string_view<CharT>{}, 42});
44
45 {
46 std::basic_format_parse_context<CharT> context(fmt);
47 assert(std::to_address(context.begin()) == &fmt[0]);
48 assert(std::to_address(context.end()) == &fmt[3]);
49 }
50 {
51 std::basic_string_view view{fmt};
52 std::basic_format_parse_context context(view);
53 assert(context.begin() == view.begin());
54 assert(context.end() == view.end());
55 }
56}
57
58constexpr bool test() {
59 test(fmt: "abc");
60#ifndef TEST_HAS_NO_WIDE_CHARACTERS
61 test(fmt: L"abc");
62#endif
63#ifndef TEST_HAS_NO_CHAR8_T
64 test(fmt: u8"abc");
65#endif
66 test(fmt: u"abc");
67 test(fmt: U"abc");
68
69 return true;
70}
71
72int main(int, char**) {
73 test();
74 static_assert(test());
75
76 return 0;
77}
78

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