libcxx/test/std/utilities/format/format.tuple/format.functions.format.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
  10 // UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
  11
  12 // TODO FMT This test should not require std::to_chars(floating-point)
  13 // XFAIL: availability-fp_to_chars-missing
  14
  15 // <format>
  16
  17 // template<class charT, formattable<charT>... Ts>
  18 //   struct formatter<pair-or-tuple<Ts...>, charT>
  19 //
  20 // tested in the format functions
  21 //
  22 // template<class... Args>
  23 //   string format(format-string<Args...> fmt, const Args&... args);
  24 // template<class... Args>
  25 //   wstring format(wformat-string<Args...> fmt, const Args&... args);
  26
  27 #include <format>
  28 #include <cassert>
  29
  30 #include "format.functions.tests.h"
  31 #include "test_format_string.h"
  32 #include "test_macros.h"
  33 #include "assert_macros.h"
  34 #include "concat_macros.h"
  35
  36 auto test = []<class CharT, class... Args>(
  37                 std::basic_string_view<CharT> expected, test_format_string<CharT, Args...> fmt, Args&&... args) {
  38   std::basic_string<CharT> out = std::format(fmt, std::forward<Args>(args)...);
  39   TEST_REQUIRE(out == expected,
  40                TEST_WRITE_CONCATENATED(
  41                    "\nFormat string   ", fmt.get(), "\nExpected output ", expected, "\nActual output   ", out, '\n'));
  42 };
  43
  44 auto test_exception = []<class CharT, class... Args>(std::string_view, std::basic_string_view<CharT>, Args&&...) {
  45   // After P2216 most exceptions thrown by std::format become ill-formed.
  46   // Therefore this tests does nothing.
  47   // A basic ill-formed test is done in format.verify.cpp
  48   // The exceptions are tested by other functions that don't use the basic-format-string as fmt argument.
  49 };
  50
  51 int main(int, char**) {
  52   run_tests<char>(test, test_exception);
  53
  54 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  55   run_tests<wchar_t>(test, test_exception);
  56 #endif
  57
  58   return 0;
  59 }