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
9// UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
10
11// XFAIL: availability-fp_to_chars-missing
12
13// <format>
14
15// string vformat(string_view fmt, format_args args);
16// wstring vformat(wstring_view fmt, wformat_args args);
17
18#include <format>
19#include <cassert>
20#include <vector>
21
22#include "test_macros.h"
23#include "format_tests.h"
24#include "string_literal.h"
25#include "assert_macros.h"
26#include "concat_macros.h"
27
28auto test = []<class CharT, class... Args>(
29 std::basic_string_view<CharT> expected, std::basic_string_view<CharT> fmt, Args&&... args) constexpr {
30 std::basic_string<CharT> out = std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...));
31 TEST_REQUIRE(out == expected,
32 TEST_WRITE_CONCATENATED(
33 "\nFormat string ", fmt, "\nExpected output ", expected, "\nActual output ", out, '\n'));
34};
35
36auto test_exception =
37 []<class CharT, class... Args>(
38 [[maybe_unused]] std::string_view what,
39 [[maybe_unused]] std::basic_string_view<CharT> fmt,
40 [[maybe_unused]] Args&&... args) {
41 TEST_VALIDATE_EXCEPTION(
42 std::format_error,
43 [&]([[maybe_unused]] const std::format_error& e) {
44 TEST_LIBCPP_REQUIRE(
45 e.what() == what,
46 TEST_WRITE_CONCATENATED(
47 "\nFormat string ", fmt, "\nExpected exception ", what, "\nActual exception ", e.what(), '\n'));
48 },
49 TEST_IGNORE_NODISCARD std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...)));
50 };
51
52int main(int, char**) {
53#if !defined(TEST_HAS_NO_EXCEPTIONS)
54 // reproducer of https://llvm.org/PR65011
55 try {
56 const char fmt[] = {'{', '0'};
57 char buf[4096];
58 [[maybe_unused]] auto ignored =
59 std::vformat_to(buf, std::string_view{fmt, fmt + sizeof(fmt)}, std::make_format_args());
60 } catch (...) {
61 }
62#endif // !defined(TEST_HAS_NO_EXCEPTIONS)
63
64 format_tests<char, execution_modus::full>(check: test, check_exception: test_exception);
65
66#ifndef TEST_HAS_NO_WIDE_CHARACTERS
67 format_tests_char_to_wchar_t(check: test);
68 format_tests<wchar_t, execution_modus::full>(check: test, check_exception: test_exception);
69#endif
70
71 return 0;
72}
73

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