A thread that stops itself cleanly (std::jthread)

std::jthread joins at destruction and carries a stop token, so the two classic thread bugs — a forgotten join and a thread with no way to stop — are both gone by construction.

#include <chrono>
#include <iostream>
#include <stop_token>
#include <thread>

int main() {
    std::jthread worker([](std::stop_token st) {
        while (!st.stop_requested()) {
            std::this_thread::sleep_for(std::chrono::milliseconds(100));
        }
        std::cout << "stopped cleanly\n";
    });
    std::this_thread::sleep_for(std::chrono::milliseconds(250));
    worker.request_stop();
} // jthread joins here: no detach, no manual join, no forgotten thread

Observed output (with the gcc16 lib path at runtime):

stopped cleanly

Facts verified 2026-11-04. The code on this page was compiled and run on the box with GCC 16.2.0 at -std=c++23 -Wall -Wextra; the outputs quoted are the observed outputs. MSVC was not tested.

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