gistfile1.cpp

class Stream {
public:
    Stream(std::vector<unsigned char> const& data)
        : data(&data) { }

    void seek(std::size_t newOffset) {
        if (newOffset >= data->size()) {
            throw "fuck";
        }
        offset = newOffset;
    }

    unsigned char read() {
        seek(offset + 1);
        return data->at(offset);
    }

private:
    std::size_t offset;
    std::vector<unsigned char> const* data;
};