The template specialization of std::formatter for the std::thread::id class allows users to convert a thread identifier to its textual representation using formatting functions.

Format specification

The syntax of format specifications is:

fill-and-align and width have the same meaning as in standard format specification. The default alignment is >.

The formatted output matches the output of operator<<, adjusted as appropriate for the format specifiers.

Notes

Example

#include <format>
#include <iostream>
#include <thread>

int main()
{
    std::thread::id this_id = std::this_thread::get_id();
    std::thread::id null_id;

    std::cout << std::format("current thread id: {}\n", this_id);
    std::cout << std::format("{:=^10}\n", null_id);
}

current thread id: 140046396632256
====0=====

See also