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: no-localization 11 // UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME 12 13 // XFAIL: availability-fp_to_chars-missing 14 15 // <format> 16 17 // template<class Out, class... Args> 18 // Out format_to(Out out, const locale& loc, 19 // format-string<Args...> fmt, const Args&... args); 20 // template<class Out, class... Args> 21 // Out format_to(Out out, const locale& loc, 22 // wformat-string<Args...> fmt, const Args&... args); 23 24 #include <format> 25 #include <algorithm> 26 #include <cassert> 27 #include <iterator> 28 #include <list> 29 #include <locale> 30 #include <vector> 31 32 #include "test_macros.h" 33 #include "format_tests.h" 34 #include "string_literal.h" 35 #include "test_format_string.h" 36 #include "test_iterators.h" 37 38 auto test = 39 []<class CharT, class... Args>( 40 std::basic_string_view<CharT> expected, test_format_string<CharT, Args...> fmt, Args&&... args) constexpr { 41 { 42 std::basic_string<CharT> out(expected.size(), CharT(' ')); 43 auto it = std::format_to(out.begin(), std::locale(), fmt, std::forward<Args>(args)...); 44 assert(it == out.end()); 45 assert(out == expected); 46 } 47 { 48 std::list<CharT> out; 49 std::format_to(std::back_inserter(out), std::locale(), fmt, std::forward<Args>(args)...); 50 assert(std::equal(out.begin(), out.end(), expected.begin(), expected.end())); 51 } 52 { 53 std::vector<CharT> out; 54 std::format_to(std::back_inserter(out), std::locale(), fmt, std::forward<Args>(args)...); 55 assert(std::equal(out.begin(), out.end(), expected.begin(), expected.end())); 56 } 57 { 58 assert(expected.size() < 4096 && "Update the size of the buffer."); 59 CharT out[4096]; 60 cpp20_output_iterator<CharT*> it = 61 std::format_to(cpp20_output_iterator{out}, std::locale(), fmt, std::forward<Args>(args)...); 62 assert(std::distance(out, base(it)) == int(expected.size())); 63 // Convert to std::string since output contains '\0' for boolean tests. 64 assert(std::basic_string<CharT>(out, base(it)) == expected); 65 } 66 }; 67 68 auto test_exception = []<class CharT, class... Args>(std::string_view, std::basic_string_view<CharT>, Args&&...) { 69 // After P2216 most exceptions thrown by std::format_to become ill-formed. 70 // Therefore this tests does nothing. 71 // A basic ill-formed test is done in format_to.locale.verify.cpp 72 // The exceptions are tested by other functions that don't use the basic-format-string as fmt argument. 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