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// demo_shared_ptr.cpp : demonstrates adding serialization to a template
// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . Polymorphic
// derived pointer example by David Tonge.
// 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)
//
// See http://www.boost.org for updates, documentation, and revision history.
#include <iomanip>
#include <iostream>
#include <cstddef> // NULL
#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/text_oarchive.hpp>
#include <boost/archive/text_iarchive.hpp>
#include <boost/archive/tmpdir.hpp>
#include <boost/serialization/shared_ptr.hpp>
///////////////////////////
// test shared_ptr serialization
class A
{
private:
friend class boost::serialization::access;
int x;
template<class Archive>
void serialize(Archive & ar, const unsigned int /* file_version */){
ar & x;
}
public:
static int count;
A(){++count;} // default constructor
virtual ~A(){--count;} // default destructor
};
BOOST_SERIALIZATION_SHARED_PTR(A)
/////////////////
// ADDITION BY DT
class B : public A
{
private:
friend class boost::serialization::access;
int x;
template<class Archive>
void serialize(Archive & ar, const unsigned int /* file_version */){
ar & boost::serialization::base_object<A>(*this);
}
public:
static int count;
B() : A() {};
virtual ~B() {};
};
BOOST_SERIALIZATION_SHARED_PTR(B)
/////////////////
int A::count = 0;
void display(boost::shared_ptr<A> &spa, boost::shared_ptr<A> &spa1)
{
std::cout << "a = 0x" << std::hex << spa.get() << " ";
if (spa.get()) std::cout << "is a " << typeid(*(spa.get())).name() << "* ";
std::cout << "use count = " << std::dec << spa.use_count() << std::endl;
std::cout << "a1 = 0x" << std::hex << spa1.get() << " ";
if (spa1.get()) std::cout << "is a " << typeid(*(spa1.get())).name() << "* ";
std::cout << "use count = " << std::dec << spa1.use_count() << std::endl;
std::cout << "unique element count = " << A::count << std::endl;
}
int main(int /* argc */, char * /*argv*/[])
{
std::string filename(boost::archive::tmpdir());
filename += "/testfile";
// create a new shared pointer to ta new object of type A
boost::shared_ptr<A> spa(new A);
boost::shared_ptr<A> spa1;
spa1 = spa;
display(spa, spa1);
// serialize it
{
std::ofstream ofs(filename.c_str());
boost::archive::text_oarchive oa(ofs);
oa << spa;
oa << spa1;
}
// reset the shared pointer to NULL
// thereby destroying the object of type A
spa.reset();
spa1.reset();
display(spa, spa1);
// restore state to one equivalent to the original
// creating a new type A object
{
// open the archive
std::ifstream ifs(filename.c_str());
boost::archive::text_iarchive ia(ifs);
// restore the schedule from the archive
ia >> spa;
ia >> spa1;
}
display(spa, spa1);
spa.reset();
spa1.reset();
std::cout << std::endl;
std::cout << std::endl;
std::cout << "New tests" << std::endl;
/////////////////
// ADDITION BY DT
// create a new shared pointer to ta new object of type A
spa = boost::shared_ptr<A>(new B);
spa1 = spa;
display(spa, spa1);
// serialize it
{
std::ofstream ofs(filename.c_str());
boost::archive::text_oarchive oa(ofs);
oa.register_type(static_cast<B *>(NULL));
oa << spa;
oa << spa1;
}
// reset the shared pointer to NULL
// thereby destroying the object of type B
spa.reset();
spa1.reset();
display(spa, spa1);
// restore state to one equivalent to the original
// creating a new type B object
{
// open the archive
std::ifstream ifs(filename.c_str());
boost::archive::text_iarchive ia(ifs);
// restore the schedule from the archive
ia.register_type(static_cast<B *>(NULL));
ia >> spa;
ia >> spa1;
}
display(spa, spa1);
///////////////
std::remove(filename.c_str());
// obj of type A gets destroyed
// as smart_ptr goes out of scope
return 0;
}
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