cppFileReaderClassInheritanceDemo

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


class FileReader
{
protected:
    std::string path;
    std::ifstream inf;
public:
    FileReader(std::string pathP) : path{ pathP }, inf{pathP}
    {
        if (!inf) { throw std::runtime_error("I/O Error!"); }
    }

    virtual void display(const char byte)const
    {
        std::cout << byte;
    }

    const FileReader& show()
    {
        while (!inf.eof())
        {
            display(inf.get());
        }
        return *this;
    }
    virtual ~FileReader() { inf.close(); }
};

class FileReaderASCII : public FileReader
{
public:
    FileReaderASCII(std::string pathP) : FileReader{ pathP } {}
    void display(const char byte) const override
    {
        if (byte > 0)
        {
            std::cout << static_cast<unsigned int>(byte) << ' ';
        }
    }
};

class FileReaderBIN : public FileReader
{
public:
    FileReaderBIN(std::string pathP) : FileReader{ pathP } {}
    void display(const char byte) const override
    {
        if (byte > 0)
        {
            for (int bit{ 7 }, mask{1}; bit >= 0; --bit, mask  = (1 << bit))
            {
                std::cout << static_cast<bool>(byte & mask);
            }
            std::cout << ' ';
        }
    }
};

int main()
{
    std::unique_ptr<FileReader> readers[3];
    // CHANGE THIS TO REAL FILENAME PATH!!!
    std::string fileName{ "../ConsoleApplication8/ConsoleApplication8.cpp" };
    try
    {
        readers[0] = std::make_unique<FileReader>(fileName);
        readers[1] = std::make_unique<FileReaderASCII>(fileName);
        readers[2] = std::make_unique<FileReaderBIN>(fileName);

        for (const auto& reader : readers)
        {
            std::cout << "\n####### Output for " << typeid(*reader).name() << "#######\n";
            reader->show();
        }
    }
    catch(std::exception& ex)
    {
        std::cout << "ERROR: " << ex.what() << '\n';
        return -1;
    }
}