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

   1 //===----------------------------------------------------------------------===//
   2 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   3 // See https://llvm.org/LICENSE.txt for license information.
   4 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   5 //
   6 //===----------------------------------------------------------------------===//
   7
   8 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
   9 // UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
  10
  11 // XFAIL: availability-fp_to_chars-missing
  12
  13 // <format>
  14
  15 // template<class charT, formattable<charT>... Ts>
  16 //   struct formatter<pair-or-tuple<Ts...>, charT>
  17 //
  18 // tested in the format functions
  19 //
  20 // string vformat(string_view fmt, format_args args);
  21 // wstring vformat(wstring_view fmt, wformat_args args);
  22
  23 #include <format>
  24 #include <cassert>
  25
  26 #include "test_macros.h"
  27 #include "format.functions.tests.h"
  28 #include "assert_macros.h"
  29 #include "concat_macros.h"
  30
  31 auto test = []<class CharT, class... Args>(
  32                 std::basic_string_view<CharT> expected, std::basic_string_view<CharT> fmt, Args&&... args) {
  33   std::basic_string<CharT> out = std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...));
  34   TEST_REQUIRE(out == expected,
  35                TEST_WRITE_CONCATENATED(
  36                    "\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
  37 };
  38
  39 auto test_exception =
  40     []<class CharT, class... Args>(
  41         [[maybe_unused]] std::string_view what,
  42         [[maybe_unused]] std::basic_string_view<CharT> fmt,
  43         [[maybe_unused]] Args&&... args) {
  44       TEST_VALIDATE_EXCEPTION(
  45           std::format_error,
  46           [&]([[maybe_unused]] const std::format_error& e) {
  47             TEST_LIBCPP_REQUIRE(
  48                 e.what() == what,
  49                 TEST_WRITE_CONCATENATED(
  50                     "\nFormat string   ", fmt, "\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
  51           },
  52           TEST_IGNORE_NODISCARD std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...)));
  53     };
  54
  55 int main(int, char**) {
  56   run_tests<char>(test, test_exception);
  57
  58 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  59   run_tests<wchar_t>(test, test_exception);
  60 #endif
  61
  62   return 0;
  63 }