#pragma once

class Reader {
public:
    virtual ~Reader() {}

    virtual void close() = 0;  // Closes the stream and releases any system
                               // resources associated with it.
    virtual int read() = 0;  // Reads a single character.
    virtual int read(
        wchar_t cbuf[], unsigned int off,
        unsigned int len) = 0;  // Reads characters into a portion of an array.
};