permaStorage.cpp

/*
 * More permanent storage solution
 * 
 */

#include <iostream>
#include <fstream>
#include <list>
#include <string>

//For testing
#include <stdio.h>
#include <assert.h>

//Make permanent list, i.e. save it in a file
void MakePermaList(std::string filename, std::list<int> permaList)
{
	
	//declare an output file variable 
	std::ofstream outfile;	
			
	//open outfile for input only
	outfile.open(filename.c_str());

	//loop through the list and write each value on a separate line
	for (std::list<int>::iterator i=permaList.begin(); i!=permaList.end(); ++i)
	{	
		//write the values in the file, separated by endl symbol
		outfile << *i << std::endl;
	}
	
	//close the outfile	
	outfile.close();

}

//Read previously saved list
std::list<int> ReadPermaList(std::string filename)
{
	std::ifstream infile;
	std::list<int> outlist;
	int line;
	
	//open the input file
	infile.open(filename.c_str());
	
	//as long as the file is not corrupted keep going
	while (infile.good())
	{


		//push the vaule from the stream to line
		infile >> line;		
		
		//if it is still not the end of the file, push int to list
		if (!infile.eof())
		{			
			//push line int on the list
			outlist.push_back(line);
		}
	}	
	
	//close the input file
	infile.close();
	
	//return the list
	return outlist;
		
}


int main()
{
	//define file name
	std::string filename = "foo";
	//create a standard list
	std::list<int> myList (2,50);

	//call MakePermaList to store it on the HDD
	MakePermaList(filename, myList);

/*
 * We made a permanent copy. We can now remove the list from memory
 * and get back to it later, or just keep it and have a backup on HDD
 * 
 */

	//read the list 
	std::list<int> myPermaList = ReadPermaList(filename);
	
	
	//check if myList and myPermaList is the same
	assert(myList == myPermaList);
	std::cout << "Success! Both of the lists are the same" << std::endl;


	return 0;
}