libcxx/test/std/utilities/format/format.tuple/format.functions.format.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
  11 // UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
  12
  13 // TODO FMT This test should not require std::to_chars(floating-point)
  14 // XFAIL: availability-fp_to_chars-missing
  15
  16 // <format>
  17
  18 // template<class charT, formattable<charT>... Ts>
  19 //   struct formatter<pair-or-tuple<Ts...>, charT>
  20 //
  21 // tested in the format functions
  22 //
  23 // template<class... Args>
  24 //   string format(format-string<Args...> fmt, const Args&... args);
  25 // template<class... Args>
  26 //   wstring format(wformat-string<Args...> fmt, const Args&... args);
  27
  28 #include <format>
  29 #include <cassert>
  30
  31 #include "format.functions.tests.h"
  32 #include "test_format_string.h"
  33 #include "test_macros.h"
  34 #include "assert_macros.h"
  35 #include "concat_macros.h"
  36
  37 auto test = []<class CharT, class... Args>(
  38                 std::basic_string_view<CharT> expected, test_format_string<CharT, Args...> fmt, Args&&... args) {
  39   std::basic_string<CharT> out = std::format(fmt, std::forward<Args>(args)...);
  40   TEST_REQUIRE(out == expected,
  41                TEST_WRITE_CONCATENATED(
  42                    "\nFormat string   ", fmt.get(), "\nExpected output ", expected, "\nActual output   ", out, '\n'));
  43 };
  44
  45 auto test_exception = []<class CharT, class... Args>(std::string_view, std::basic_string_view<CharT>, Args&&...) {
  46   // After P2216 most exceptions thrown by std::format become ill-formed.
  47   // Therefore this tests does nothing.
  48   // A basic ill-formed test is done in format.verify.cpp
  49   // The exceptions are tested by other functions that don't use the basic-format-string as fmt argument.
  50 };
  51
  52 int main(int, char**) {
  53   run_tests<char>(test, test_exception);
  54
  55 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  56   run_tests<wchar_t>(test, test_exception);
  57 #endif
  58
  59   return 0;
  60 }