libcxx/test/std/utilities/format/format.range/format.range.fmtmap/parse.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 // template<ranges::input_range R, class charT>
  16 //   struct range-default-formatter<range_format::map, R, charT>
  17
  18 // template<class ParseContext>
  19 //   constexpr typename ParseContext::iterator
  20 //     parse(ParseContext& ctx);
  21
  22 // Note this tests the basics of this function. It's tested in more detail in
  23 // the format.functions test.
  24
  25 #include <cassert>
  26 #include <concepts>
  27 #include <format>
  28 #include <map>
  29 #include <memory>
  30
  31 #include "test_macros.h"
  32 #include "make_string.h"
  33
  34 #define SV(S) MAKE_STRING_VIEW(CharT, S)
  35
  36 template <class StringViewT>
  37 constexpr void test_parse(StringViewT fmt, std::size_t offset) {
  38   using CharT    = typename StringViewT::value_type;
  39   auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
  40   std::formatter<std::map<int, int>, CharT> formatter;
  41   static_assert(std::semiregular<decltype(formatter)>);
  42
  43   std::same_as<typename StringViewT::iterator> auto it = formatter.parse(parse_ctx);
  44   // std::to_address works around LWG3989 and MSVC STL's iterator debugging mechanism.
  45   assert(std::to_address(it) == std::to_address(fmt.end()) - offset);
  46 }
  47
  48 template <class CharT>
  49 constexpr void test_fmt() {
  50   test_parse(SV(""), 0);
  51   test_parse(SV(":5"), 0);
  52
  53   test_parse(SV("}"), 1);
  54   test_parse(SV(":5}"), 1);
  55 }
  56
  57 constexpr bool test() {
  58   test_fmt<char>();
  59 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  60   test_fmt<wchar_t>();
  61 #endif
  62
  63   return true;
  64 }
  65
  66 int main(int, char**) {
  67   test();
  68   static_assert(test());
  69
  70   return 0;
  71 }