libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/format.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 FormatContext>
  20 //   typename FormatContext::iterator
  21 //     format(const T& r, FormatContext& ctx) const;
  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 <iterator>
  29 #include <thread>
  30
  31 #include "test_format_context.h"
  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 void test_format(StringViewT expected, std::thread::id arg) {
  39   using CharT      = typename StringViewT::value_type;
  40   using String     = std::basic_string<CharT>;
  41   using OutIt      = std::back_insert_iterator<String>;
  42   using FormatCtxT = std::basic_format_context<OutIt, CharT>;
  43
  44   const std::formatter<std::thread::id, CharT> formatter;
  45
  46   String result;
  47   OutIt out             = std::back_inserter(result);
  48   FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
  49   formatter.format(arg, format_ctx);
  50   assert(result == expected);
  51 }
  52
  53 template <class CharT>
  54 void test_fmt() {
  55 #if !defined(__APPLE__) && !defined(__FreeBSD__)
  56   test_format(SV("0"), std::thread::id());
  57 #else
  58   test_format(SV("0x0"), std::thread::id());
  59 #endif
  60 }
  61
  62 void test() {
  63   test_fmt<char>();
  64 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  65   test_fmt<wchar_t>();
  66 #endif
  67 }
  68
  69 int main(int, char**) {
  70   test();
  71
  72   return 0;
  73 }