https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115099
Bug ID: 115099
Summary: compilation error: format thread::id
Product: gcc
Version: 14.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: faithandbrave at gmail dot com
Target Milestone: ---
#include <iostream>
#include <format>
#include <thread>
int main()
{
std::cout << __cpp_lib_formatters << std::endl;
std::cout << std::format("{}", std::this_thread::get_id()) << std::endl;
std::cout << std::format("{: >30}", std::this_thread::get_id()) <<
std::endl;
}
outputs:
In file included from prog.cc:3:
/opt/wandbox/gcc-head/include/c++/15.0.0/thread: In instantiation of 'typename
std::basic_format_context<_Out, _CharT>::iterator
std::formatter<std::thread::id, _CharT>::format(std::thread::id,
std::basic_format_context<_Out, _CharT>&) const [with _Out =
std::__format::_Sink_iter<char>; _CharT = char; typename
std::basic_format_context<_Out, _CharT>::iterator =
std::basic_format_context<std::__format::_Sink_iter<char>, char>::iterator]':
/opt/wandbox/gcc-head/include/c++/15.0.0/format:3247:40: required from
'static void
std::basic_format_arg<_Context>::handle::_S_format(std::basic_format_parse_context<typename
_Context::char_type>&, _Context&, const void*) [with _Tq = const
std::thread::id; _Context =
std::basic_format_context<std::__format::_Sink_iter<char>, char>; typename
_Context::char_type = char]'
3247 | __format_ctx.advance_to(__f.format(__val, __format_ctx));
| ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~
/opt/wandbox/gcc-head/include/c++/15.0.0/format:3255:11: required from
'std::basic_format_arg<_Context>::handle::handle(_Tp&) [with _Tp =
std::thread::id; _Context =
std::basic_format_context<std::__format::_Sink_iter<char>, char>]'
3255 | auto __func = _S_format<__maybe_const_t<_Tp>>;
| ^~~~~~
/opt/wandbox/gcc-head/include/c++/15.0.0/format:3486:13: required from
'std::basic_format_arg<_Context>::basic_format_arg(_Tp&) [with _Tp =
std::thread::id; _Context =
std::basic_format_context<std::__format::_Sink_iter<char>, char>]'
3486 | _M_set(static_cast<_Td>(__v));
| ^~~~~~~~~~~~~~~~~~~~~
/opt/wandbox/gcc-head/include/c++/15.0.0/format:3743:31: required from
'static std::__format::_Arg_store<_Context, _Args>::_Element_t
std::__format::_Arg_store<_Context, _Args>::_S_make_elt(_Tp&) [with _Tp =
std::thread::id; _Context =
std::basic_format_context<std::__format::_Sink_iter<char>, char>; _Args =
{std::basic_format_arg<std::basic_format_context<std::__format::_Sink_iter<char>,
char> >::handle}; _Element_t =
std::__format::_Arg_store<std::basic_format_context<std::__format::_Sink_iter<char>,
char>,
std::basic_format_arg<std::basic_format_context<std::__format::_Sink_iter<char>,
char> >::handle>::_Element_t]'
3743 | basic_format_arg<_Context> __arg(__v);
| ^~~~~
/opt/wandbox/gcc-head/include/c++/15.0.0/format:3754:23: required from
'std::__format::_Arg_store<_Context, _Args>::_Arg_store(_Tp& ...) [with _Tp =
{std::thread::id}; _Context =
std::basic_format_context<std::__format::_Sink_iter<char>, char>; _Args =
{std::basic_format_arg<std::basic_format_context<std::__format::_Sink_iter<char>,
char> >::handle}]'
3754 | : _M_args{_S_make_elt(__a)...}
| ~~~~~~~~~~~^~~~~
/opt/wandbox/gcc-head/include/c++/15.0.0/format:3804:14: required from 'auto
std::make_format_args(_Args& ...) [with _Context =
basic_format_context<__format::_Sink_iter<char>, char>; _Args = {thread::id}]'
3804 | return _Store(__fmt_args...);
| ^~~~~~~~~~~~~~~~~~~~~
/opt/wandbox/gcc-head/include/c++/15.0.0/format:4291:61: required from
'std::string std::format(format_string<_Args ...>, _Args&& ...) [with _Args =
{thread::id}; string = __cxx11::basic_string<char>; format_string<_Args ...> =
basic_format_string<char, thread::id>]'
4291 | { return std::vformat(__fmt.get(),
std::make_format_args(__args...)); }
| ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
prog.cc:8:29: required from here
8 | std::cout << std::format("{}", std::this_thread::get_id()) <<
std::endl;
| ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/opt/wandbox/gcc-head/include/c++/15.0.0/thread:334:44: error:
'std::__cxx11::basic_ostringstream<char> __os' has incomplete type
334 | std::basic_ostringstream<_CharT> __os;
| ^~~~
It seems missing include <sstream> at <thread>.
