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 // template<class Out> 17 // Out vformat_to(Out out, string_view fmt, format_args args); 18 // template<class Out> 19 // Out vformat_to(Out out, wstring_view fmt, wformat_args_t args); 20 21 #include <format> 22 #include <algorithm> 23 #include <cassert> 24 #include <list> 25 #include <vector> 26 27 #include "assert_macros.h" 28 #include "concat_macros.h" 29 #include "test_macros.h" 30 #include "format_tests.h" 31 #include "string_literal.h" 32 33 auto test = []<class CharT, class... Args>( 34 std::basic_string_view<CharT> expected, std::basic_string_view<CharT> fmt, Args&&... args) constexpr { 35 { 36 std::basic_string<CharT> out(expected.size(), CharT(' ')); 37 auto it = std::vformat_to(out.begin(), fmt, std::make_format_args<context_t<CharT>>(args...)); 38 assert(it == out.end()); 39 assert(out == expected); 40 } 41 { 42 std::list<CharT> out; 43 std::vformat_to(std::back_inserter(out), fmt, std::make_format_args<context_t<CharT>>(args...)); 44 assert(std::equal(out.begin(), out.end(), expected.begin(), expected.end())); 45 } 46 { 47 std::vector<CharT> out; 48 std::vformat_to(std::back_inserter(out), fmt, std::make_format_args<context_t<CharT>>(args...)); 49 assert(std::equal(out.begin(), out.end(), expected.begin(), expected.end())); 50 } 51 { 52 assert(expected.size() < 4096 && "Update the size of the buffer."); 53 CharT out[4096]; 54 CharT* it = std::vformat_to(out, fmt, std::make_format_args<context_t<CharT>>(args...)); 55 assert(std::distance(out, it) == int(expected.size())); 56 // Convert to std::string since output contains '\0' for boolean tests. 57 assert(std::basic_string<CharT>(out, it) == expected); 58 } 59 }; 60 61 auto 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 [&] { 75 std::basic_string<CharT> out; 76 std::vformat_to(std::back_inserter(out), fmt, std::make_format_args<context_t<CharT>>(args...)); 77 }()); 78 }; 79 80 int main(int, char**) { 81 format_tests<char, execution_modus::partial>(test, test_exception); 82 83 #ifndef TEST_HAS_NO_WIDE_CHARACTERS 84 format_tests_char_to_wchar_t(test); 85 format_tests<wchar_t, execution_modus::partial>(test, test_exception); 86 #endif 87 88 return 0; 89 } 90