CSV file generator

csvfile.h

#pragma once
#include <string>
#include <iostream>
#include <fstream>
#include <sstream>

class csvfile;

inline static csvfile& endrow(csvfile& file);
inline static csvfile& flush(csvfile& file);

class csvfile
{
    std::ofstream fs_;
    bool is_first_;
    const std::string separator_;
    const std::string escape_seq_;
    const std::string special_chars_;
public:
    csvfile(const std::string filename, const std::string separator = ";")
        : fs_()
        , is_first_(true)
        , separator_(separator)
        , escape_seq_("\"")
        , special_chars_("\"")
    {
        fs_.exceptions(std::ios::failbit | std::ios::badbit);
        fs_.open(filename);
    }

    ~csvfile()
    {
        flush();
        fs_.close();
    }

    void flush()
    {
        fs_.flush();
    }

    void endrow()
    {
        fs_ << std::endl;
        is_first_ = true;
    }

    csvfile& operator << ( csvfile& (* val)(csvfile&))
    {
        return val(*this);
    }

    csvfile& operator << (const char * val)
    {
        return write(escape(val));
    }

    csvfile& operator << (const std::string & val)
    {
        return write(escape(val));
    }

    template<typename T>
    csvfile& operator << (const T& val)
    {
        return write(val);
    }

private:
    template<typename T>
    csvfile& write (const T& val)
    {
        if (!is_first_)
        {
            fs_ << separator_;
        }
        else
        {
            is_first_ = false;
        }
        fs_ << val;
        return *this;
    }

    std::string escape(const std::string & val)
    {
        std::ostringstream result;
        result << '"';
        std::string::size_type to, from = 0u, len = val.length();
        while (from < len &&
                std::string::npos != (to = val.find_first_of(special_chars_, from)))
        {
            result << val.substr(from, to - from) << escape_seq_ << val[to];
            from = to + 1;
        }
        result << val.substr(from) << '"';
        return result.str();
    }
};


inline static csvfile& endrow(csvfile& file)
{
    file.endrow();
    return file;
}

inline static csvfile& flush(csvfile& file)
{
    file.flush();
    return file;
}

main.cpp

#include "csvfile.h"

int main()
{
    try
    {
        csvfile csv("MyTable.csv"); // throws exceptions!
        // Hearer
        csv << "X" << "VALUE" << endrow;
        // Data
        int i = 1;
        csv << i++ << "String value" << endrow;
        csv << i++ << 123 << endrow;
        csv << i++ << 1.f << endrow;
        csv << i++ << 1.2 << endrow;
        csv << i++ << "One more string" << endrow;
        csv << i++ << "\"Escaped\"" << endrow;
        csv << i++ << "=HYPERLINK(\"https://playkey.net\"; \"Playkey Service\")" << endrow;
    }
    catch (const std::exception &ex)
    {
        std::cout << "Exception was thrown: " << ex.what() << std::endl;
    }
    return 0;
}