libcxx/test/std/utilities/format/format.functions/format.locale.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: no-localization
  10 // UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
  11
  12 // XFAIL: availability-fp_to_chars-missing
  13
  14 // <format>
  15
  16 // template<class... Args>
  17 //   string format(const locale& loc, format-string<Args...> fmt, const Args&... args);
  18 // template<class... Args>
  19 //   wstring format(const locale& loc, wformat-string<Args...> fmt, const Args&... args);
  20
  21 #include <format>
  22 #include <cassert>
  23 #include <iostream>
  24 #include <vector>
  25
  26 #include "test_macros.h"
  27 #include "format_tests.h"
  28 #include "string_literal.h"
  29 #include "test_format_string.h"
  30 #include "assert_macros.h"
  31 #include "concat_macros.h"
  32
  33 auto test =
  34     []<class CharT, class... Args>(
  35         std::basic_string_view<CharT> expected, test_format_string<CharT, Args...> fmt, Args&&... args) constexpr {
  36       std::basic_string<CharT> out = std::format(std::locale(), fmt, std::forward<Args>(args)...);
  37       TEST_REQUIRE(
  38           out == expected,
  39           TEST_WRITE_CONCATENATED(
  40               "\nFormat string   ", fmt.get(), "\nExpected output ", expected, "\nActual output   ", out, '\n'));
  41     };
  42
  43 auto test_exception = []<class CharT, class... Args>(std::string_view, std::basic_string_view<CharT>, Args&&...) {
  44   // After P2216 most exceptions thrown by std::format become ill-formed.
  45   // Therefore this tests does nothing.
  46   // A basic ill-formed test is done in format.locale.verify.cpp
  47   // The exceptions are tested by other functions that don't use the basic-format-string as fmt argument.
  48 };
  49
  50 int main(int, char**) {
  51   format_tests<char, execution_modus::full>(test, test_exception);
  52
  53 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  54   format_tests_char_to_wchar_t(test);
  55   format_tests<wchar_t, execution_modus::full>(test, test_exception);
  56 #endif
  57
  58   return 0;
  59 }