[C++]Persistenza

[Luc@s]

 
/*
### Copyright (c) 2004 Luca Francesca
### This script is provided under the terms of the GNU General Public License
### (see http://www.gnu.org/licenses/gpl.html for the full license text.)
*/
#include <iostream>
#include <fstream>
#include <string>

using namespace std;

class CProva
{
	private:
		int n;
	public:
		CProva(): n(0){};
		CProva(int N): n(N){};
		~CProva(){};
		friend ostream& operator<<(ostream& os, CProva& c)
  	        {
  		  os << c.n;
  		  return os;
 	 	};
		friend istream& operator>>(istream& is, CProva& c)
  	        {
  		  is >> c.n;
  		  return is;
 	 	};
};

int main(int argc, char *argv[])
{
	CProva c(10);
	
	ofstream of("i.txt");
	ifstream ifs("i.txt");
	// save the state of class
	of << c << "\n"; 
	of.close();
	// sreload the state of class
	ifs >> c;
	cout << c << "\n"; 
	ifs.close();
	
	cout << endl;
	char esc;
 	std::cin.get(esc);
 	return 0;
}

In questo modo ottengo una specie di persistenza dei dati.
Ho ragione o sbaglio???


Tnk