libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/format.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 // UNSUPPORTED: no-threads
  10
  11 // UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
  12
  13 // <thread>
  14
  15 // template<class charT>
  16 // struct formatter<thread::id, charT>;
  17
  18 // template<class FormatContext>
  19 //   typename FormatContext::iterator
  20 //     format(const T& r, FormatContext& ctx) const;
  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 <iterator>
  28 #include <thread>
  29
  30 #include "test_format_context.h"
  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 void test_format(StringViewT expected, std::thread::id arg) {
  38   using CharT      = typename StringViewT::value_type;
  39   using String     = std::basic_string<CharT>;
  40   using OutIt      = std::back_insert_iterator<String>;
  41   using FormatCtxT = std::basic_format_context<OutIt, CharT>;
  42
  43   const std::formatter<std::thread::id, CharT> formatter;
  44
  45   String result;
  46   OutIt out             = std::back_inserter(result);
  47   FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
  48   formatter.format(arg, format_ctx);
  49   assert(result == expected);
  50 }
  51
  52 template <class CharT>
  53 void test_fmt() {
  54 #if !defined(__APPLE__) && !defined(__FreeBSD__)
  55   test_format(SV("0"), std::thread::id());
  56 #else
  57   test_format(SV("0x0"), std::thread::id());
  58 #endif
  59 }
  60
  61 void test() {
  62   test_fmt<char>();
  63 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  64   test_fmt<wchar_t>();
  65 #endif
  66 }
  67
  68 int main(int, char**) {
  69   test();
  70
  71   return 0;
  72 }