libcxx/test/std/utilities/format/format.functions/vformat.pass.cpp

   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 // string vformat(string_view fmt, format_args args);
  17 // wstring vformat(wstring_view fmt, wformat_args args);
  18
  19 #include <format>
  20 #include <cassert>
  21 #include <vector>
  22
  23 #include "test_macros.h"
  24 #include "format_tests.h"
  25 #include "string_literal.h"
  26 #include "assert_macros.h"
  27 #include "concat_macros.h"
  28
  29 auto test = []<class CharT, class... Args>(
  30                 std::basic_string_view<CharT> expected, std::basic_string_view<CharT> fmt, Args&&... args) constexpr {
  31   std::basic_string<CharT> out = std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...));
  32   TEST_REQUIRE(out == expected,
  33                TEST_WRITE_CONCATENATED(
  34                    "\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
  35 };
  36
  37 auto test_exception =
  38     []<class CharT, class... Args>(
  39         [[maybe_unused]] std::string_view what,
  40         [[maybe_unused]] std::basic_string_view<CharT> fmt,
  41         [[maybe_unused]] Args&&... args) {
  42       TEST_VALIDATE_EXCEPTION(
  43           std::format_error,
  44           [&]([[maybe_unused]] const std::format_error& e) {
  45             TEST_LIBCPP_REQUIRE(
  46                 e.what() == what,
  47                 TEST_WRITE_CONCATENATED(
  48                     "\nFormat string   ", fmt, "\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
  49           },
  50           TEST_IGNORE_NODISCARD std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...)));
  51     };
  52
  53 int main(int, char**) {
  54 #if !defined(TEST_HAS_NO_EXCEPTIONS)
  55   // reproducer of https://llvm.org/PR65011
  56   try {
  57     const char fmt[] = {'{', '0'};
  58     char buf[4096];
  59     [[maybe_unused]] auto ignored =
  60         std::vformat_to(buf, std::string_view{fmt, fmt + sizeof(fmt)}, std::make_format_args());
  61   } catch (...) {
  62   }
  63 #endif // !defined(TEST_HAS_NO_EXCEPTIONS)
  64
  65   format_tests<char, execution_modus::full>(test, test_exception);
  66
  67 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  68   format_tests_char_to_wchar_t(test);
  69   format_tests<wchar_t, execution_modus::full>(test, test_exception);
  70 #endif
  71
  72   return 0;
  73 }