operator[]

ops.cpp

class ROM {
public:
  ROM(std::array<uint8_t, 1024> buf) { _buffer = std::move(buf); }
  const uint16_t operator[](const uint16_t offset) const {
    if (offset > _buffer.size()) {
      return 0x0;
    }
    // This is a big-endian machine, indexed by 16-bit words
    return (_buffer[offset] << 8) + (_buffer[offset + 1]);
  }
private:
  std::array<uint8_t, 1024> _buffer;
}

class Memory {
public:
  Memory(ROM rom) {
    _ram.fill(0);
    _rom = std::move(rom);
  }
  
  // operator[]??
  // Say we have an instance called mem
  // mem[0x200] should return _rom[0x0] and be read-only
  // mem[0x602] or higher should return _ram[0x602] or higher and be read-write.
  
private:
  ROM _rom;
  std::array<uint8_t, 2560> _ram;
};