libcxx/test/std/utilities/format/format.tuple/set_brackets.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 // <format>
  13
  14 // template<class charT, formattable<charT>... Ts>
  15 //   struct formatter<pair-or-tuple<Ts...>, charT>
  16
  17 // constexpr void constexpr void set_brackets(basic_string_view<charT> opening,
  18 //                                            basic_string_view<charT> closing) noexcept;
  19
  20 // Note this tests the basics of this function. It's tested in more detail in
  21 // the format functions tests.
  22
  23 #include <format>
  24 #include <tuple>
  25 #include <utility>
  26
  27 #include "make_string.h"
  28
  29 #define SV(S) MAKE_STRING_VIEW(CharT, S)
  30
  31 template <class CharT, class Arg>
  32 constexpr void test() {
  33   std::formatter<Arg, CharT> formatter;
  34   formatter.set_brackets(SV("open"), SV("close"));
  35   // Note the SV macro may throw, so can't use it.
  36   static_assert(noexcept(formatter.set_brackets(std::basic_string_view<CharT>{}, std::basic_string_view<CharT>{})));
  37
  38   // Note there is no direct way to validate this function modified the object.
  39 }
  40
  41 template <class CharT>
  42 constexpr void test() {
  43   test<CharT, std::tuple<int>>();
  44   test<CharT, std::tuple<int, CharT>>();
  45   test<CharT, std::pair<int, CharT>>();
  46   test<CharT, std::tuple<int, CharT, bool>>();
  47 }
  48
  49 constexpr bool test() {
  50   test<char>();
  51 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  52   test<wchar_t>();
  53 #endif
  54
  55   return true;
  56 }
  57
  58 int main(int, char**) {
  59   test();
  60   static_assert(test());
  61
  62   return 0;
  63 }