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// test_shared_ptr.cpp

// (C) Copyright 2002 Robert Ramey- http://www.rrsd.com - 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 <cstddef> // NULL
#include <fstream>

#include <cstdio> // remove
#include <boost/config.hpp>
#if defined(BOOST_NO_STDC_NAMESPACE)
namespace std{ 
    using ::remove;
}
#endif

#include "test_tools.hpp"

#include <boost/serialization/shared_ptr_132.hpp>
#include <boost/serialization/shared_ptr.hpp>
#include <boost/serialization/weak_ptr.hpp>
#include <boost/serialization/split_member.hpp>

#include <boost/preprocessor/stringize.hpp>

#include <boost/serialization/nvp.hpp>
#include <boost/serialization/export.hpp>

// This is a simple class.  It contains a counter of the number
// of objects of this class which have been instantiated.
class A
{
private:
    friend class boost::serialization::access;
    int x;
    template<class Archive>
    void save(Archive & ar, const unsigned int /* file_version */) const {
        ar << BOOST_SERIALIZATION_NVP(x);
    }
    template<class Archive>
    void load(Archive & ar, const unsigned int /* file_version */) {
        ar >> BOOST_SERIALIZATION_NVP(x);
    }
    BOOST_SERIALIZATION_SPLIT_MEMBER()
public:
    static int count;
    bool operator==(const A & rhs) const {
        return x == rhs.x;
    }
    A(){++count;}    // default constructor
    virtual ~A(){--count;}   // default destructor
};

BOOST_SERIALIZATION_SHARED_PTR(A)

// B is a subclass of A
class B : public A
{
private:
    friend class boost::serialization::access;
    template<class Archive>
    void save(Archive & ar, const unsigned int /* file_version */ )const {
        ar << BOOST_SERIALIZATION_BASE_OBJECT_NVP(A);
    }
    template<class Archive>
    void load(Archive & ar, const unsigned int /* file_version */){
        ar >> BOOST_SERIALIZATION_BASE_OBJECT_NVP(A);
    }
    BOOST_SERIALIZATION_SPLIT_MEMBER()
public:
    static int count;
    B() : A() {};
    virtual ~B() {};
};

// B needs to be exported because its serialized via a base class pointer
BOOST_SHARED_POINTER_EXPORT(B)
BOOST_SERIALIZATION_SHARED_PTR(B)

int A::count = 0;

template<class T>
void save(const char * testfile, const T & spa)
{
    test_ostream os(testfile, TEST_STREAM_FLAGS);
    test_oarchive oa(os, TEST_ARCHIVE_FLAGS);
    oa << BOOST_SERIALIZATION_NVP(spa);
}

template<class T>
void load(const char * testfile, T & spa)
{
    test_istream is(testfile, TEST_STREAM_FLAGS);
    test_iarchive ia(is, TEST_ARCHIVE_FLAGS);
    ia >> BOOST_SERIALIZATION_NVP(spa);
}

// trivial test
template<class T>
void save_and_load(const T & spa)
{
    const char * testfile = boost::archive::tmpnam(NULL);
    BOOST_REQUIRE(NULL != testfile);
    save(testfile, spa);

    // note that we're loading to a current version of shared_ptr 
    // regardless of the orignal saved type - this tests backward
    // archive compatibility
    boost::shared_ptr<A> spa1;
    load(testfile, spa1);

    BOOST_CHECK(
        (spa.get() == NULL && spa1.get() == NULL)
        || * spa == * spa1
    );
    std::remove(testfile);
}

template<class T>
void save2(
    const char * testfile, 
    const T & first, 
    const T & second
){
    test_ostream os(testfile, TEST_STREAM_FLAGS);
    test_oarchive oa(os, TEST_ARCHIVE_FLAGS);
    oa << BOOST_SERIALIZATION_NVP(first);
    oa << BOOST_SERIALIZATION_NVP(second);
}

template<class T>
void load2(
    const char * testfile, 
    T & first, 
    T & second)
{
    test_istream is(testfile, TEST_STREAM_FLAGS);
    test_iarchive ia(is, TEST_ARCHIVE_FLAGS);
    ia >> BOOST_SERIALIZATION_NVP(first);
    ia >> BOOST_SERIALIZATION_NVP(second);
}

// Run tests by serializing two shared_ptrs into an archive,
// clearing them (deleting the objects) and then reloading the
// objects back from an archive.
template<class T>
void save_and_load2(T & first, T & second)
{
    const char * testfile = boost::archive::tmpnam(NULL);
    BOOST_REQUIRE(NULL != testfile);

    save2(testfile, first, second);

    // Clear the pointers, thereby destroying the objects they contain
    first.reset();
    second.reset();

    boost::shared_ptr<A> first1, second1;
    load2(testfile, first1, second1);

    BOOST_CHECK(first1 == second1);
    std::remove(testfile);
}

template<class T>
void save3(
    const char * testfile, 
    const T & first, 
    const T & second,
    const T & third
){
    test_ostream os(testfile, TEST_STREAM_FLAGS);
    test_oarchive oa(os, TEST_ARCHIVE_FLAGS);
    oa << BOOST_SERIALIZATION_NVP(third);
    oa << BOOST_SERIALIZATION_NVP(first);
    oa << BOOST_SERIALIZATION_NVP(second);
}

template<class T>
void load3(
    const char * testfile, 
    T & first, 
    T & second,
    T & third
){
    test_istream is(testfile, TEST_STREAM_FLAGS);
    test_iarchive ia(is, TEST_ARCHIVE_FLAGS);
    // note that we serialize the weak pointer first
    ia >> BOOST_SERIALIZATION_NVP(third);
    // inorder to test that a temporarily solitary weak pointer
    // correcttly restored.
    ia >> BOOST_SERIALIZATION_NVP(first);
    ia >> BOOST_SERIALIZATION_NVP(second);
}

// This does the tests
int test_main(int /* argc */, char * /* argv */[])
{
    // These are our shared_ptrs
    boost_132::shared_ptr<A> spa;

    // trivial test 1
    save_and_load(spa);

    //trivial test 2
    spa.reset();
    spa = boost_132::shared_ptr<A>(new A);
    save_and_load(spa);

    // Try to save and load pointers to As, to a text archive
    spa = boost_132::shared_ptr<A>(new A);
    boost_132::shared_ptr<A> spa1 = spa;
    save_and_load2(spa, spa1);
    
    // Try to save and load pointers to Bs, to a text archive
    spa = boost_132::shared_ptr<A>(new B);
    save_and_load(spa);

    spa1 = spa;
    save_and_load2(spa, spa1);

    // obj of type B gets destroyed
    // as smart_ptr goes out of scope
    return EXIT_SUCCESS;
}