Parser.h

//Parser.h
#pragma once

#include <sstream>

template<typename T>
class Parser{

private:
    std::istream& input;
    std::string stopLine;
public:
    Parser(std::istream& input, std::string& stopLine) : input(input), stopLine(stopLine){}
    bool readNext(T& toParse){
        this->input >> toParse;
        std::ostringstream s;
        s << toParse;
        if(s.str() == this->stopLine){
            return false;
        }
        return true;
    }
};