libcxx/test/std/utilities/format/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
   9 // UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
  10
  11 // XFAIL: availability-fp_to_chars-missing
  12
  13 // <format>
  14
  15 // string vformat(string_view fmt, format_args args);
  16 // wstring vformat(wstring_view fmt, wformat_args args);
  17
  18 #include <format>
  19 #include <cassert>
  20 #include <vector>
  21
  22 #include "test_macros.h"
  23 #include "format_tests.h"
  24 #include "string_literal.h"
  25 #include "assert_macros.h"
  26 #include "concat_macros.h"
  27
  28 auto test = []<class CharT, class... Args>(
  29                 std::basic_string_view<CharT> expected, std::basic_string_view<CharT> fmt, Args&&... args) constexpr {
  30   std::basic_string<CharT> out = std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...));
  31   TEST_REQUIRE(out == expected,
  32                TEST_WRITE_CONCATENATED(
  33                    "\nFormat string   ", fmt, "\nExpected output ", expected, "\nActual output   ", out, '\n'));
  34 };
  35
  36 auto test_exception =
  37     []<class CharT, class... Args>(
  38         [[maybe_unused]] std::string_view what,
  39         [[maybe_unused]] std::basic_string_view<CharT> fmt,
  40         [[maybe_unused]] Args&&... args) {
  41       TEST_VALIDATE_EXCEPTION(
  42           std::format_error,
  43           [&]([[maybe_unused]] const std::format_error& e) {
  44             TEST_LIBCPP_REQUIRE(
  45                 e.what() == what,
  46                 TEST_WRITE_CONCATENATED(
  47                     "\nFormat string   ", fmt, "\nExpected exception ", what, "\nActual exception   ", e.what(), '\n'));
  48           },
  49           TEST_IGNORE_NODISCARD std::vformat(fmt, std::make_format_args<context_t<CharT>>(args...)));
  50     };
  51
  52 int main(int, char**) {
  53 #if !defined(TEST_HAS_NO_EXCEPTIONS)
  54   // reproducer of https://llvm.org/PR65011
  55   try {
  56     const char fmt[] = {'{', '0'};
  57     char buf[4096];
  58     [[maybe_unused]] auto ignored =
  59         std::vformat_to(buf, std::string_view{fmt, fmt + sizeof(fmt)}, std::make_format_args());
  60   } catch (...) {
  61   }
  62 #endif // !defined(TEST_HAS_NO_EXCEPTIONS)
  63
  64   format_tests<char, execution_modus::full>(test, test_exception);
  65
  66 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  67   format_tests_char_to_wchar_t(test);
  68   format_tests<wchar_t, execution_modus::full>(test, test_exception);
  69 #endif
  70
  71   return 0;
  72 }