libcxx/test/std/utilities/format/format.tuple/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, c++20
  10 // UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
  11
  12 // XFAIL: availability-fp_to_chars-missing
  13
  14 // <format>
  15
  16 // template<class charT, formattable<charT>... Ts>
  17 //   struct formatter<pair-or-tuple<Ts...>, charT>
  18 //
  19 // tested in the format functions
  20 //
  21 // string vformat(string_view fmt, format_args args);
  22 // wstring vformat(wstring_view fmt, wformat_args args);
  23
  24 #include <format>
  25 #include <cassert>
  26
  27 #include "test_macros.h"
  28 #include "format.functions.tests.h"
  29 #include "assert_macros.h"
  30 #include "concat_macros.h"
  31
  32 auto test = []<class CharT, class... Args>(
  33                 std::basic_string_view<CharT> expected, std::basic_string_view<CharT> fmt, Args&&... args) {
  34   std::basic_string<CharT> out = std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...));
  35   TEST_REQUIRE(out == expected,
  36                TEST_WRITE_CONCATENATED(
  37                    "\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
  38 };
  39
  40 auto test_exception =
  41     []<class CharT, class... Args>(
  42         [[maybe_unused]] std::string_view what,
  43         [[maybe_unused]] std::basic_string_view<CharT> fmt,
  44         [[maybe_unused]] Args&&... args) {
  45       TEST_VALIDATE_EXCEPTION(
  46           std::format_error,
  47           [&]([[maybe_unused]] const std::format_error& e) {
  48             TEST_LIBCPP_REQUIRE(
  49                 e.what() == what,
  50                 TEST_WRITE_CONCATENATED(
  51                     "\nFormat string   ", fmt, "\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
  52           },
  53           TEST_IGNORE_NODISCARD std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...)));
  54     };
  55
  56 int main(int, char**) {
  57   run_tests<char>(test, test_exception);
  58
  59 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  60   run_tests<wchar_t>(test, test_exception);
  61 #endif
  62
  63   return 0;
  64 }