#include <cstdlib>
#include <stdexcept>
#include <memory>
#include <boost/smart_ptr.hpp>
#include <iostream>
#include <iomanip>
using namespace std;
using boost::scoped_ptr;
using boost::shared_ptr;
using boost::weak_ptr;

//---------------------------------------------------------------------------
class A
{
public:
    A(const char *pdestroy_message);
    ~A();
    const char* const getMessage() const;
private:
    char* pmsg;
};
//---------------------------------------------------------------------------
class B
{
    public:
    B();
    ~B();
};
//---------------------------------------------------------------------------
A::A(const char* pdestroy_message) : pmsg(0)
{
    pmsg   =   new char[strlen(pdestroy_message) + 1];
    strcpy(pmsg, pdestroy_message);
    cout << "A is created!" << " " << pmsg << endl;
}
//---------------------------------------------------------------------------
A::~A()
{
    cout << pmsg << endl;
    delete[] pmsg;
}
//---------------------------------------------------------------------------
const char* const A::getMessage() const
{
    return pmsg;
}
//---------------------------------------------------------------------------
B::B()
{
    cout << "B is being created!" << endl;
    throw std::logic_error("Too bad!");
}
//---------------------------------------------------------------------------
B::~B()
{
    cout << "B is destroyed!" << endl;
}
//---------------------------------------------------------------------------
shared_ptr<A> spglobal(new A("Global shared_ptr<A> destroyed!"));
//---------------------------------------------------------------------------
void main()
{
    weak_ptr<A> wpglobal(spglobal);
    shared_ptr<A> splocal = wpglobal.lock();

    if ( splocal ) try
    {
        A a("Local A variable destroyed!");
        auto_ptr<A> apa(new A("auto_ptr<A> destroyed!"));
        scoped_ptr<A> scpa(new A("scoped_ptr<A> destroyed!"));
        shared_ptr<A> spa(new A("Local shared_ptr<A> destroyed!"));
        cout << "Access to global object through the local one!" << " " << splocal->getMessage() << endl;
        B b;
    }
    catch( std::exception& e)
    {
        cout << "Exception cought: " << " " << e.what() << endl;
    }
}