change code on 19 Oct

demo.cpp

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// demo.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 <cstddef> // NULL
#include <iomanip>
#include <iostream>
#include <fstream>
#include <string>
#include <list>

#include <boost/archive/tmpdir.hpp>

#include <boost/archive/text_iarchive.hpp>
#include <boost/archive/text_oarchive.hpp>

#include <boost/serialization/base_object.hpp>
#include <boost/serialization/utility.hpp>
#include <boost/serialization/list.hpp>
#include <boost/serialization/assume_abstract.hpp>
using namespace std;

/////////////////////////////////////////////////////////////
// The intent of this program is to serve as a tutorial for
// users of the serialization package.  An attempt has been made
// to illustrate most of the facilities of the package.  
//
// The intent is to create an example suffciently complete to
// illustrate the usage and utility of the package while
// including a minimum of other code. 
//
// This illustration models the bus system of a small city.
// This includes, multiple bus stops,  bus routes and schedules.
// There are different kinds of stops.  Bus stops in general will
// will appear on multiple routes.  A schedule will include
// muliple trips on the same route.

/////////////////////////////////////////////////////////////
// gps coordinate
//
// llustrates serialization for a simple type
//
class gps_position
{
    friend std::ostream & operator<<(std::ostream &os, const gps_position &gp);
    friend class boost::serialization::access;
    int degrees;
    int minutes;
    float seconds;
    template<class Archive>
    void serialize(Archive & ar, const unsigned int /* file_version */){
        ar & degrees & minutes & seconds;
    }
public:
    // every serializable class needs a constructor
    void getval()
    {
       cout<<"degrees: "<<degrees<<" , minutes: "<<minutes<<" , seconds: "<<seconds<<endl;
    }
    gps_position(){};
    gps_position(int _d, int _m, float _s) : 
        degrees(_d), minutes(_m), seconds(_s)
    {}
};
std::ostream & operator<<(std::ostream &os, const gps_position &gp)
{
    return os << ' ' << gp.degrees << (unsigned char)186 << gp.minutes << '\'' << gp.seconds << '"';
}

/////////////////////////////////////////////////////////////
// One bus stop
//
// illustrates serialization of serializable members
//

class bus_stop
{
    friend class boost::serialization::access;
    friend std::ostream & operator<<(std::ostream &os, const bus_stop &gp);
    virtual std::string description() const = 0;
    gps_position latitude;
    gps_position longitude;
    template<class Archive>
    void serialize(Archive &ar, const unsigned int version)
    {
        ar & latitude;
        ar & longitude;
    }
protected:
    bus_stop(const gps_position & _lat, const gps_position & _long) :
        latitude(_lat), longitude(_long)
    {}
public:
    bus_stop(){}
    virtual ~bus_stop(){}
};

BOOST_SERIALIZATION_ASSUME_ABSTRACT(bus_stop)

std::ostream & operator<<(std::ostream &os, const bus_stop &bs)
{
    return os << bs.latitude << bs.longitude << ' ' << bs.description();
}

/////////////////////////////////////////////////////////////
// Several kinds of bus stops
//
// illustrates serialization of derived types
//
class bus_stop_corner : public bus_stop
{
    friend class boost::serialization::access;
    std::string street1;
    std::string street2;
    virtual std::string description() const
    {
        return street1 + " and " + street2;
    }
    template<class Archive>
    void serialize(Archive &ar, const unsigned int version)
    {
        // save/load base class information
        ar & boost::serialization::base_object<bus_stop>(*this);
        ar & street1 & street2;
    }

public:
    bus_stop_corner(){}
    bus_stop_corner(const gps_position & _lat, const gps_position & _long,
        const std::string & _s1, const std::string & _s2
    ) :
        bus_stop(_lat, _long), street1(_s1), street2(_s2)
    {
    }
};

class bus_stop_destination : public bus_stop
{
    friend class boost::serialization::access;
    std::string name;
    virtual std::string description() const
    {
        return name;
    }
    template<class Archive>
    void serialize(Archive &ar, const unsigned int version)
    {
        ar & boost::serialization::base_object<bus_stop>(*this) & name;
    }
public:
    
    bus_stop_destination(){}
    bus_stop_destination(
        const gps_position & _lat, const gps_position & _long, const std::string & _name
    ) :
        bus_stop(_lat, _long), name(_name)
    {
    }
};

/////////////////////////////////////////////////////////////
// a bus route is a collection of bus stops
//
// illustrates serialization of STL collection templates.
//
// illustrates serialzation of polymorphic pointer (bus stop *);
//
// illustrates storage and recovery of shared pointers is correct
// and efficient.  That is objects pointed to by more than one
// pointer are stored only once.  In such cases only one such
// object is restored and pointers are restored to point to it
//
class bus_route
{
    friend class boost::serialization::access;
    friend std::ostream & operator<<(std::ostream &os, const bus_route &br);
    typedef bus_stop * bus_stop_pointer;
    std::list<bus_stop_pointer> stops;
    template<class Archive>
    void serialize(Archive &ar, const unsigned int version)
    {
        // in this program, these classes are never serialized directly but rather
        // through a pointer to the base class bus_stop. So we need a way to be
        // sure that the archive contains information about these derived classes.
        //ar.template register_type<bus_stop_corner>();
        ar.register_type(static_cast<bus_stop_corner *>(NULL));
        //ar.template register_type<bus_stop_destination>();
        ar.register_type(static_cast<bus_stop_destination *>(NULL));
        // serialization of stl collections is already defined
        // in the header
        ar & stops;
    }
public:
    bus_route(){}
    void append(bus_stop *_bs)
    {

        stops.insert(stops.end(), _bs);
        /**
			* it is a syntax of filling an empty LIST. create an empty list and 
         * then point to the end postion with the iterator and then fill it
         */
    }

	 void do_print()
	 {
		 cout<<"I am in bus_route class\n";
	 }

	 std::list<bus_stop_pointer> return_stops()
	 {
		 return stops;
	 }
};
std::ostream & operator<<(std::ostream &os, const bus_route &br)
{
    std::list<bus_stop *>::const_iterator it;
    // note: we're displaying the pointer to permit verification
    // that duplicated pointers are properly restored.
    for(it = br.stops.begin(); it != br.stops.end(); it++){
        os << '\n' << std::hex << "0x" << *it << std::dec << ' ' << **it;
    }
    return os;
}

/////////////////////////////////////////////////////////////
// a bus schedule is a collection of routes each with a starting time
//
// Illustrates serialization of STL objects(pair) in a non-intrusive way.
// See definition of operator<< <pair<F, S> >(ar, pair) and others in
// serialization.hpp
// 
// illustrates nesting of serializable classes
//
// illustrates use of version number to automatically grandfather older
// versions of the same class.

class bus_schedule
{
public:
    // note: this structure was made public. because the friend declarations
    // didn't seem to work as expected.
    struct trip_info
    {
        template<class Archive>
        void serialize(Archive &ar, const unsigned int file_version)
        {
            // in versions 2 or later
            if(file_version >= 2)
                // read the drivers name
                ar & driver;
            // all versions have the follwing info
            ar & hour & minute;
        }

        // starting time
        int hour;
        int minute;
        // only after system shipped was the driver's name added to the class
        std::string driver;

        trip_info(){}
        trip_info(int _h, int _m, const std::string &_d) :
            hour(_h), minute(_m), driver(_d)
        {}
    };
    struct trip_info STRUCT_TRIP;
private:
    friend class boost::serialization::access;
    friend std::ostream & operator<<(std::ostream &os, const bus_schedule &bs);
    friend std::ostream & operator<<(std::ostream &os, const bus_schedule::trip_info &ti);
    std::list<std::pair<trip_info, bus_route *> > schedule;
    template<class Archive>
    void serialize(Archive &ar, const unsigned int version)
    {
        ar & schedule;
    }
public:
    void append(const std::string &_d, int _h, int _m, bus_route *_br)
    {
        schedule.insert(schedule.end(), std::make_pair(trip_info(_h, _m, _d), _br));
        /**it is a syntax of filling an empty LIST. create an empty list and 
         * then point to the end postion with the iterator and then fill it
         */
    }

    void print_list_schedule()
    {
       for(auto k = schedule.begin();k!=schedule.end();++k)
      {
         cout<<(*k).first<<" ____ "<<(*k).second<<endl;
      }
      cout<<"\n";
    }

	 std::list<std::pair<trip_info, bus_route *> >  return_schedule()
	 {
		 return schedule;
	 }
    bus_schedule(){}
};
BOOST_CLASS_VERSION(bus_schedule::trip_info, 2)

std::ostream & operator<<(std::ostream &os, const bus_schedule::trip_info &ti)
{
    return os << '\n' << ti.hour << ':' << ti.minute << ' ' << ti.driver << ' ';
}
std::ostream & operator<<(std::ostream &os, const bus_schedule &bs)
{
    std::list<std::pair<bus_schedule::trip_info, bus_route *> >::const_iterator it;
    for(it = bs.schedule.begin(); it != bs.schedule.end(); it++){
        os << it->first <<" °°°°° "<< *(it->second); // print first and second element of the pair
    }
    return os;
}

/**
 * removed static type for save and relaod object
*/
template<typename T1>
void save_schedule(const T1 &s, const char * filename){
    // make an archive
    std::ofstream ofs(filename);
    boost::archive::text_oarchive oa(ofs);
    oa << s;
}

template<typename T1>
void restore_schedule(T1 &s, const char * filename)
{
    // open the archive
    std::ifstream ifs(filename);
    boost::archive::text_iarchive ia(ifs);

    // restore the schedule from the archive
    ia >> s;
}

int main(int argc, char *argv[])
{   
    // make the schedule
    /**
     * Following object is the updated or will update the program finally. This class has 3 member variable and one function
     * which require those 3 member and one pointer type object as the arguments. That pointer type data will come from bus route
     * class's object
     */
    bus_schedule original_schedule;

    // fill in the data
    // make a few stops
    /** bus_stop class is a ABSTRAC_CLASS so it canot create object but it can instatiate pointer type object
     * in the following lines this is happening. And look about the constructor of bus_stop_corner and bus_stop_destination
     * class. both child class inherited bus_stop class "publicly". bus_stop class has two member variable whose types
     * are of gps_position class's type. Again both child class's has their own member. Just they are called in the following cases
     */
    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
    /**
     * this class require only a default constructor
     * this class bus_route has a append function which require pointer type variable to fill and the type is bus_stop class
     **/
    bus_route route0;
    route0.append(bs0);
    route0.append(bs1);
    route0.append(bs2);

    // add trips to schedule
    /**
     * Go to the class bus_schedule and you will find that it has one struct named trip_info whose has 3 member.
     * this class has one private member whose type is LIST, name is schedule
     * one public function which takes the 4 arguments to append in the LIST.
     * (first 3 passes to the STRUCT's constructor), (second argument is the bus_route type pointer)
     * they make noting but a PAIR and fill the LIST
     */
    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 += "/demofile.txt";

    // save the schedule
    save_schedule(original_schedule, filename.c_str());
	//  save_schedule(route0, filename.c_str());

    // ... some time later
    // make  a new schedule
    bus_schedule new_schedule;
	//  bus_route route0_reload;

    restore_schedule(new_schedule, filename.c_str());
	//  restore_schedule(route0_reload, 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::cout<<"\n\nDeserializing Started\n"<<std::endl;
   // decltype (auto) x;
   // std::cout<<new_schedule[0]<<std::endl;
   // auto x = new_schedule.STRUCT_TRIP;
   // new_schedule.print_list_schedule();
   // cout<<x<<endl;
	auto returning_schedule = new_schedule.return_schedule(); // returning list from bus_schedule class
	// returning_schedule::iterator it_a;
	for(auto i:returning_schedule)
	{
		// cout<<(i.first)<<" ~~~~~~~ "<<(i.first).driver<<" ~~~~~~~ "<<(i.second)<<endl;
		// cout<<(i.second)<<" ~~~~~~ "<<*(i.second)<<endl;
		// cout<<(i.second)<<endl;
		// (i.second)->do_print(); // this works to access member function of bus_route class
		auto x_a =  (i.second)->return_stops();
		for(auto j : x_a)
		{
			cout<<j<<" ******* "<<*j<<endl;
		}
		// *(i.second) and *(i.second) are same
	}



	/**
	 * In the following line I have tried to fetch the object data using the class named bus_stop
	 */
	// cout<<route0_reload<<endl;
	// bus_stop * here_pointer_bus_stop;
	// auto x = route0_reload.return_stops();
	// for (auto i : x) // iterating through the ist that returned from the bus_route class
	// 		std::cout <<i<<" and the value: "<< *i <<" ******* "<<endl; // using i->latitude you can get value of latitude but it is private. make it public, works
	
    delete bs0;
    delete bs1;
    delete bs2;
    delete bs3;
    return 0;
}