/* * This file is part of MXE. See LICENSE.md for licensing information. */ #include <iostream>#include <boost/archive/xml_oarchive.hpp>#include <boost/thread/thread.hpp>#include <boost/thread/tss.hpp> boost::thread_specific_ptr<int> ptr; // https://www.boost.org/doc/libs/1_76_0/libs/context/doc/html/context/context.html#include <boost/context/fiber_fcontext.hpp>namespace ctx=boost::context; void test_thread(){    if (ptr.get() == 0) {        ptr.reset(new int(0));    }    std::cout << "Hello, World! from thread" << std::endl;} int main(int argc, char *argv[]){    (void)argc;    (void)argv;     boost::archive::xml_oarchive oa(std::cout);    std::string s = "\n\n    Hello, World!\n\n";    oa << BOOST_SERIALIZATION_NVP(s);     boost::thread thrd(test_thread);    thrd.join();     int data=0;    ctx::fiber f1{[&data](ctx::fiber&& f2) {        std::cout << "f1: entered first time: " << data << std::endl;        data+=1;        f2=std::move(f2).resume();        std::cout << "f1: entered second time: " << data << std::endl;        data+=1;        f2=std::move(f2).resume();        std::cout << "f1: entered third time: " << data << std::endl;        return std::move(f2);    }};    f1=std::move(f1).resume();    std::cout << "f1: returned first time: " << data << std::endl;    data+=1;    f1=std::move(f1).resume();    std::cout << "f1: returned second time: " << data << std::endl;    data+=1;    f1=std::move(f1).resume_with([&data](ctx::fiber&& f2){        std::cout << "f2: entered: " << data << std::endl;        data=-1;        return std::move(f2);    });    std::cout << "f1: returned third time" << std::endl;    return 0;}