libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/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 // UNSUPPORTED: no-threads
  11
  12 // UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
  13
  14 // <thread>
  15
  16 // template<class charT>
  17 // struct formatter<thread::id, charT>;
  18
  19 // template<class ParseContext>
  20 //   constexpr typename ParseContext::iterator
  21 //     parse(ParseContext& ctx);
  22
  23 // Note this tests the basics of this function. It's tested in more detail in
  24 // the format functions test.
  25
  26 #include <cassert>
  27 #include <concepts>
  28 #include <format>
  29 #include <memory>
  30 #include <thread>
  31
  32 #include "test_macros.h"
  33 #include "make_string.h"
  34
  35 #define SV(S) MAKE_STRING_VIEW(CharT, S)
  36
  37 template <class StringViewT>
  38 constexpr void test_parse(StringViewT fmt, std::size_t offset) {
  39   using CharT    = typename StringViewT::value_type;
  40   auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
  41   std::formatter<std::thread::id, CharT> formatter;
  42   static_assert(std::semiregular<decltype(formatter)>);
  43
  44   std::same_as<typename StringViewT::iterator> auto it = formatter.parse(parse_ctx);
  45   // std::to_address works around LWG3989 and MSVC STL's iterator debugging mechanism.
  46   assert(std::to_address(it) == std::to_address(fmt.end()) - offset);
  47 }
  48
  49 template <class CharT>
  50 constexpr void test_fmt() {
  51   test_parse(SV(""), 0);
  52   test_parse(SV("1"), 0);
  53
  54   test_parse(SV("}"), 1);
  55   test_parse(SV("1}"), 1);
  56 }
  57
  58 constexpr bool test() {
  59   test_fmt<char>();
  60 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  61   test_fmt<wchar_t>();
  62 #endif
  63
  64   return true;
  65 }
  66
  67 int main(int, char**) {
  68   test();
  69   static_assert(test());
  70
  71   return 0;
  72 }