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// UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
11
12// XFAIL: availability-fp_to_chars-missing
13
14// <format>
15
16// string vformat(string_view fmt, format_args args);
17// wstring vformat(wstring_view fmt, wformat_args args);
18
19#include <format>
20#include <cassert>
21#include <vector>
22
23#include "test_macros.h"
24#include "format_tests.h"
25#include "string_literal.h"
26#include "assert_macros.h"
27#include "concat_macros.h"
28
29auto test = []<class CharT, class... Args>(
30 std::basic_string_view<CharT> expected, std::basic_string_view<CharT> fmt, Args&&... args) constexpr {
31 std::basic_string<CharT> out = std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...));
32 TEST_REQUIRE(out == expected,
33 TEST_WRITE_CONCATENATED(
34 "\nFormat string ", fmt, "\nExpected output ", expected, "\nActual output ", out, '\n'));
35};
36
37auto test_exception =
38 []<class CharT, class... Args>(
39 [[maybe_unused]] std::string_view what,
40 [[maybe_unused]] std::basic_string_view<CharT> fmt,
41 [[maybe_unused]] Args&&... args) {
42 TEST_VALIDATE_EXCEPTION(
43 std::format_error,
44 [&]([[maybe_unused]] const std::format_error& e) {
45 TEST_LIBCPP_REQUIRE(
46 e.what() == what,
47 TEST_WRITE_CONCATENATED(
48 "\nFormat string ", fmt, "\nExpected exception ", what, "\nActual exception ", e.what(), '\n'));
49 },
50 TEST_IGNORE_NODISCARD std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...)));
51 };
52
53int main(int, char**) {
54#if !defined(TEST_HAS_NO_EXCEPTIONS)
55 // reproducer of https://llvm.org/PR65011
56 try {
57 const char fmt[] = {'{', '0'};
58 char buf[4096];
59 [[maybe_unused]] auto ignored =
60 std::vformat_to(buf, std::string_view{fmt, fmt + sizeof(fmt)}, std::make_format_args());
61 } catch (...) {
62 }
63#endif // !defined(TEST_HAS_NO_EXCEPTIONS)
64
65 format_tests<char, execution_modus::full>(check: test, check_exception: test_exception);
66
67#ifndef TEST_HAS_NO_WIDE_CHARACTERS
68 format_tests_char_to_wchar_t(check: test);
69 format_tests<wchar_t, execution_modus::full>(check: test, check_exception: test_exception);
70#endif
71
72 return 0;
73}
74

source code of libcxx/test/std/utilities/format/format.functions/vformat.pass.cpp