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: GCC-ALWAYS_INLINE-FIXME 11 12 // XFAIL: availability-fp_to_chars-missing 13 14 // <format> 15 16 // Tests the behavior of 17 // 18 // runtime-format-string<char> runtime_format(string_view fmt) noexcept; 19 // runtime-format-string<wchar_t> runtime_format(wstring_view fmt) noexcept; 20 // 21 // and 22 // 23 // template<class charT, class... Args> 24 // struct basic_format_string { 25 // ... 26 // basic_format_string(runtime-format-string<charT> s) noexcept : str(s.str) {} 27 // ... 28 // } 29 // 30 // This is done by testing it in the top-level functions: 31 // 32 // template<class... Args> 33 // string format(format_string<Args...> fmt, Args&&... args); 34 // template<class... Args> 35 // wstring format(wformat_string<Args...> fmt, Args&&... args); 36 // 37 // The basics of runtime_format and basic_format_string's constructor are tested in 38 // - libcxx/test/std/utilities/format/format.syn/runtime_format_string.pass.cpp 39 // - libcxx/test/std/utilities/format/format.fmt.string/ctor.runtime-format-string.pass.cpp 40 41 #include <format> 42 #include <cassert> 43 #include <vector> 44 45 #include "test_macros.h" 46 #include "format_tests.h" 47 #include "string_literal.h" 48 #include "assert_macros.h" 49 #include "concat_macros.h" 50 51 auto test = []<class CharT, class... Args>( 52 std::basic_string_view<CharT> expected, std::basic_string_view<CharT> fmt, Args&&... args) constexpr { 53 std::basic_string<CharT> out = std::format(std::runtime_format(fmt), std::forward<Args>(args)...); 54 TEST_REQUIRE(out == expected, 55 TEST_WRITE_CONCATENATED( 56 "\nFormat string ", fmt, "\nExpected output ", expected, "\nActual output ", out, '\n')); 57 }; 58 59 auto test_exception = 60 []<class CharT, class... Args>( 61 [[maybe_unused]] std::string_view what, 62 [[maybe_unused]] std::basic_string_view<CharT> fmt, 63 [[maybe_unused]] Args&&... args) { 64 TEST_VALIDATE_EXCEPTION( 65 std::format_error, 66 [&]([[maybe_unused]] const std::format_error& e) { 67 TEST_LIBCPP_REQUIRE( 68 e.what() == what, 69 TEST_WRITE_CONCATENATED( 70 "\nFormat string ", fmt, "\nExpected exception ", what, "\nActual exception ", e.what(), '\n')); 71 }, 72 TEST_IGNORE_NODISCARD std::format(std::runtime_format(fmt), std::forward<Args>(args)...)); 73 }; 74 75 int main(int, char**) { 76 format_tests<char, execution_modus::partial>(test, test_exception); 77 78 #ifndef TEST_HAS_NO_WIDE_CHARACTERS 79 format_tests_char_to_wchar_t(test); 80 format_tests<wchar_t, execution_modus::partial>(test, test_exception); 81 #endif 82 83 return 0; 84 } 85