| //===----------------------------------------------------------------------===// |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++03, c++11, c++14, c++17 |
| // UNSUPPORTED: libcpp-has-no-incomplete-format |
| // TODO FMT Evaluate gcc-12 status |
| // UNSUPPORTED: gcc-12 |
| |
| // XFAIL: availability-fp_to_chars-missing |
| |
| // <format> |
| |
| // template<class Out, class... Args> |
| // Out format_to(Out out, format-string<Args...> fmt, const Args&... args); |
| // template<class Out, class... Args> |
| // Out format_to(Out out, wformat-string<Args...> fmt, const Args&... args); |
| |
| #include <format> |
| #include <algorithm> |
| #include <cassert> |
| #include <iterator> |
| #include <list> |
| #include <vector> |
| |
| #include "test_macros.h" |
| #include "format_tests.h" |
| #include "string_literal.h" |
| #include "test_format_string.h" |
| #include "test_iterators.h" |
| |
| auto test = |
| []<class CharT, class... Args>( |
| std::basic_string_view<CharT> expected, test_format_string<CharT, Args...> fmt, Args&&... args) constexpr { |
| { |
| std::basic_string<CharT> out(expected.size(), CharT(' ')); |
| auto it = std::format_to(out.begin(), fmt, std::forward<Args>(args)...); |
| assert(it == out.end()); |
| assert(out == expected); |
| } |
| { |
| std::list<CharT> out; |
| std::format_to(std::back_inserter(out), fmt, std::forward<Args>(args)...); |
| assert(std::equal(out.begin(), out.end(), expected.begin(), expected.end())); |
| } |
| { |
| std::vector<CharT> out; |
| std::format_to(std::back_inserter(out), fmt, std::forward<Args>(args)...); |
| assert(std::equal(out.begin(), out.end(), expected.begin(), expected.end())); |
| } |
| { |
| assert(expected.size() < 4096 && "Update the size of the buffer."); |
| CharT out[4096]; |
| cpp20_output_iterator<CharT*> it = std::format_to(cpp20_output_iterator{out}, fmt, std::forward<Args>(args)...); |
| assert(std::distance(out, base(it)) == int(expected.size())); |
| // Convert to std::string since output contains '\0' for boolean tests. |
| assert(std::basic_string<CharT>(out, base(it)) == expected); |
| } |
| }; |
| |
| auto test_exception = []<class CharT, class... Args>(std::string_view, std::basic_string_view<CharT>, Args&&...) { |
| // After P2216 most exceptions thrown by std::format become ill-formed. |
| // Therefore this tests does nothing. |
| // A basic ill-formed test is done in format.verify.cpp |
| // The exceptions are tested by other functions that don't use the basic-format-string as fmt argument. |
| }; |
| |
| int main(int, char**) { |
| format_tests<char, execution_modus::partial>(test, test_exception); |
| |
| #ifndef TEST_HAS_NO_WIDE_CHARACTERS |
| format_tests_char_to_wchar_t(test); |
| format_tests<wchar_t, execution_modus::partial>(test, test_exception); |
| #endif |
| |
| return 0; |
| } |