libcxx/test/std/utilities/format/format.tuple/set_separator.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 // <format>
  14
  15 // class range_formatter
  16 // template<class charT, formattable<charT>... Ts>
  17 //   struct formatter<pair-or-tuple<Ts...>, charT>
  18
  19 // constexpr void set_separator(basic_string_view<charT> sep) noexcept;
  20
  21 // Note this tests the basics of this function. It's tested in more detail in
  22 // the format functions tests.
  23
  24 #include <format>
  25 #include <tuple>
  26 #include <utility>
  27
  28 #include "make_string.h"
  29
  30 #define SV(S) MAKE_STRING_VIEW(CharT, S)
  31
  32 template <class CharT, class Arg>
  33 constexpr void test() {
  34   std::formatter<Arg, CharT> formatter;
  35   formatter.set_separator(SV("sep"));
  36   // Note the SV macro may throw, so can't use it.
  37   static_assert(noexcept(formatter.set_separator(std::basic_string_view<CharT>{})));
  38
  39   // Note there is no direct way to validate this function modified the object.
  40 }
  41
  42 template <class CharT>
  43 constexpr void test() {
  44   test<CharT, std::tuple<int>>();
  45   test<CharT, std::tuple<int, CharT>>();
  46   test<CharT, std::pair<int, CharT>>();
  47   test<CharT, std::tuple<int, CharT, bool>>();
  48 }
  49
  50 constexpr bool test() {
  51   test<char>();
  52 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  53   test<wchar_t>();
  54 #endif
  55
  56   return true;
  57 }
  58
  59 int main(int, char**) {
  60   test();
  61   static_assert(test());
  62
  63   return 0;
  64 }