read_data4.cpp

#include <iostream>
#include <fstream>
#include <vector>
#include <set>
#include <iterator>
#include <string>
#include <algorithm>
/*
 * A class to create and write data in a csv file.
 */
class CSVWriter
{
    std::string fileName;
    std::string delimeter;
    int linesCount;
public:
    CSVWriter(std::string filename, std::string delm = ",") :
            fileName(filename), delimeter(delm), linesCount(0)
    {}
    /*
     * Member function to store a range as comma seperated value
     */
    template<typename T>
    void addDatainRow(T first, T last);
};
/*
 * This Function accepts a range and appends all the elements in the range
 * to the last row, seperated by delimeter (Default is comma)
 */
template<typename T>
void CSVWriter::addDatainRow(T first, T last)
{
    std::fstream file;
    // Open the file in truncate mode if first line else in Append Mode
    file.open(fileName, std::ios::out | (linesCount ? std::ios::app : std::ios::trunc));
    // Iterate over the range and add each lement to file seperated by delimeter.
    for (; first != last; )
    {
        file << *first;
        if (++first != last)
            file << delimeter;
    }
    file << "\n";
    linesCount++;
    // Close the file
    file.close();
}
int main()
{
    // Creating an object of CSVWriter
    CSVWriter writer("example.csv");

    std::vector<std::string> dataList_1 = { "20", "name", "99" };

    // Adding vector to CSV File
    writer.addDatainRow(dataList_1.begin(), dataList_1.end());

    // Create a set of integers
    std::set<int> dataList_2 = { 3, 4, 5};

    // Adding Set to CSV File
    writer.addDatainRow(dataList_2.begin(), dataList_2.end());

    std::string str = "abc";

    // Adding characters in a string in csv file.
    writer.addDatainRow(str.begin(), str.end());

    // An array of int
    int arr [] = {3,4,1};

    // Wrote an elements in array to csv file.
    writer.addDatainRow(arr , arr + sizeof(arr) / sizeof(int));
    return 0;
}