libs/serialization/example/demo_xml.cpp

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//
// demo_xml.cpp
//
// (C) Copyright 2002-4 Robert Ramey - http://www.rrsd.com .
// Use, modification and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include <iomanip>
#include <iostream>
#include <fstream>
#include <string>
#include <cstdio> // remove
#include <boost/config.hpp>
#if defined(BOOST_NO_STDC_NAMESPACE)
namespace std{ 
    using ::remove;
}
#endif
#include <boost/archive/tmpdir.hpp>
#include <boost/archive/xml_iarchive.hpp>
#include <boost/archive/xml_oarchive.hpp>
#include "demo_gps.hpp"
void save_schedule(const bus_schedule &s, const char * filename){
    // make an archive
    std::ofstream ofs(filename);
    assert(ofs.good());
    boost::archive::xml_oarchive oa(ofs);
    oa << BOOST_SERIALIZATION_NVP(s);
}
void
restore_schedule(bus_schedule &s, const char * filename)
{
    // open the archive
    std::ifstream ifs(filename);
    assert(ifs.good());
    boost::archive::xml_iarchive ia(ifs);
    // restore the schedule from the archive
    ia >> BOOST_SERIALIZATION_NVP(s);
}
int main(int argc, char *argv[])
{   
    // make the schedule
    bus_schedule original_schedule;
    // fill in the data
    // make a few stops
    bus_stop *bs0 = new bus_stop_corner(
        gps_position(34, 135, 52.560f),
        gps_position(134, 22, 78.30f),
        "24th Street", "10th Avenue"
    );
    bus_stop *bs1 = new bus_stop_corner(
        gps_position(35, 137, 23.456f),
        gps_position(133, 35, 54.12f),
        "State street", "Cathedral Vista Lane"
    );
    bus_stop *bs2 = new bus_stop_destination(
        gps_position(35, 136, 15.456f),
        gps_position(133, 32, 15.300f),
        "White House"
    );
    bus_stop *bs3 = new bus_stop_destination(
        gps_position(35, 134, 48.789f),
        gps_position(133, 32, 16.230f),
        "Lincoln Memorial"
    );
    // make a  routes
    bus_route route0;
    route0.append(bs0);
    route0.append(bs1);
    route0.append(bs2);
    // add trips to schedule
    original_schedule.append("bob", 6, 24, &route0);
    original_schedule.append("bob", 9, 57, &route0);
    original_schedule.append("alice", 11, 02, &route0);
    // make aother routes
    bus_route route1;
    route1.append(bs3);
    route1.append(bs2);
    route1.append(bs1);
    // add trips to schedule
    original_schedule.append("ted", 7, 17, &route1);
    original_schedule.append("ted", 9, 38, &route1);
    original_schedule.append("alice", 11, 47, &route1);
    // display the complete schedule
    std::cout << "original schedule";
    std::cout << original_schedule;
    
    std::string filename(boost::archive::tmpdir());
    filename += "/demo.xml";
    // save the schedule
    save_schedule(original_schedule, filename.c_str());
    // ... some time later
    // make  a new schedule
    bus_schedule new_schedule;
    restore_schedule(new_schedule, filename.c_str());
    // and display
    std::cout << "\nrestored schedule";
    std::cout << new_schedule;
    // should be the same as the old one. (except for the pointer values)
    std::remove(filename.c_str());
    delete bs0;
    delete bs1;
    delete bs2;
    delete bs3;
    return 0;
}