C++ object lifecycle example, C++ (gcc)

C++ object lifecycle example

#include <iostream>
#include <stdexcept>
#include <sstream>
#include <memory>
#include <typeinfo>
#include <limits>

using namespace std;

class FooEntry
{
	int m_x;
public:
	FooEntry(int x)
	{
		cout<<"Called "<<typeid(*this).name()<<" ctor."<<endl;
		if(x <= 0)
		{
			stringstream errMsg;
			errMsg<<"Invalid argument: "<<x<<"."<<endl;
			throw invalid_argument(errMsg.str());
		}
		m_x = x;
	}

~FooEntry()
	{
		cout<<"Called "<<typeid(*this).name()<<" dtor."<<endl;
	}

inline int GetFoo() const {return m_x;}

};

class BarEntry
{
	auto_ptr<unsigned char> m_p;
public:
	BarEntry(size_t n) //: m_p(new unsigned char [n])
	{
		cout<<"Called "<<typeid(*this).name()<<" ctor."<<endl;
		m_p.reset(new unsigned char [n]);
	}

~BarEntry()
	{
		cout<<"Called "<<typeid(*this).name()<<" dtor."<<endl;
	}

void SetBar(unsigned char bt)
	{
		m_p.get()[0] = bt;
	}

unsigned char GetBar() const {return m_p.get()[0];}
};

class Holder
{
	FooEntry m_foo;
	BarEntry m_bar;
public:
	Holder() : m_foo(1), m_bar(numeric_limits<int>::max())
	{
		cout<<"Called "<<typeid(*this).name()<<" ctor."<<endl;
	}

~Holder()
	{
		cout<<"Called "<<typeid(*this).name()<<" dtor."<<endl;
	}

void Perform()
	{
		m_bar.SetBar(m_foo.GetFoo());
		cout<<"Bar entry is "<<m_bar.GetBar()<<"."<<endl;
	}
};

int main(int argc, char* argv[])
{
	try
	{
		Holder h;
		h.Perform();
	}
	catch (exception& e)
	{
		cerr<<e.what()<<endl;
	}
	catch (...)
	{
		cerr<<"Unknown error."<<endl;
	}

cin.get();
}


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