thread::native_handle

#include <thread>
#include <iostream>
                                                                                                                
using std::thread,
    std::cerr;

int main(){

    auto thread1 = [](int n){
        cerr << "from inside thread: " << n << "\n";
    };

    thread a(thread1, 20);
    thread::native_handle_type nht = a.native_handle();
    cerr << "a's native_handle_type: " << nht << "\n";
    a.join();
    return 0;
}