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, c++20, c++23
10// UNSUPPORTED: no-localization
11// UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
12
13// XFAIL: availability-fp_to_chars-missing
14
15// <format>
16
17// Tests the behavior of
18//
19// runtime-format-string<char> runtime_format(string_view fmt) noexcept;
20// runtime-format-string<wchar_t> runtime_format(wstring_view fmt) noexcept;
21//
22// and
23//
24// template<class charT, class... Args>
25// struct basic_format_string {
26// ...
27// basic_format_string(runtime-format-string<charT> s) noexcept : str(s.str) {}
28// ...
29// }
30//
31// This is done by testing it in the top-level functions:
32//
33// template<class... Args>
34// string format(const locale& loc, format_string<Args...> fmt, Args&&... args);
35// template<class... Args>
36// wstring format(const locale& loc, wformat_string<Args...> fmt, Args&&... args);
37//
38// The basics of runtime_format and basic_format_string's constructor are tested in
39// - libcxx/test/std/utilities/format/format.syn/runtime_format_string.pass.cpp
40// - libcxx/test/std/utilities/format/format.fmt.string/ctor.runtime-format-string.pass.cpp
41
42#include <format>
43#include <cassert>
44#include <locale>
45#include <vector>
46
47#include "test_macros.h"
48#include "format_tests.h"
49#include "string_literal.h"
50#include "assert_macros.h"
51#include "concat_macros.h"
52
53auto test = []<class CharT, class... Args>(
54 std::basic_string_view<CharT> expected, std::basic_string_view<CharT> fmt, Args&&... args) constexpr {
55 std::basic_string<CharT> out = std::format(std::locale(), std::runtime_format(fmt), std::forward<Args>(args)...);
56 TEST_REQUIRE(out == expected,
57 TEST_WRITE_CONCATENATED(
58 "\nFormat string ", fmt, "\nExpected output ", expected, "\nActual output ", out, '\n'));
59};
60
61auto test_exception =
62 []<class CharT, class... Args>(
63 [[maybe_unused]] std::string_view what,
64 [[maybe_unused]] std::basic_string_view<CharT> fmt,
65 [[maybe_unused]] Args&&... args) {
66 TEST_VALIDATE_EXCEPTION(
67 std::format_error,
68 [&]([[maybe_unused]] const std::format_error& e) {
69 TEST_LIBCPP_REQUIRE(
70 e.what() == what,
71 TEST_WRITE_CONCATENATED(
72 "\nFormat string ", fmt, "\nExpected exception ", what, "\nActual exception ", e.what(), '\n'));
73 },
74 TEST_IGNORE_NODISCARD std::format(std::locale(), std::runtime_format(fmt), std::forward<Args>(args)...));
75 };
76
77int main(int, char**) {
78 format_tests<char, execution_modus::partial>(check: test, check_exception: test_exception);
79
80#ifndef TEST_HAS_NO_WIDE_CHARACTERS
81 format_tests_char_to_wchar_t(check: test);
82 format_tests<wchar_t, execution_modus::partial>(check: test, check_exception: test_exception);
83#endif
84
85 return 0;
86}
87

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