// the basic instruction

class Instruction
{
public:
    Instruction(opcode code) : _code(code), _datsize(0), _data(0) {}
    Instruction(opcode code, const char* data, size_t dataSize)
        : _code(code), _datsize(dataSize), _data(new char[dataSize])
    { memcpy(_data, data, dataSize); }	// we must store our own internal copy

    Instruction(const Instruction& instr)
        : _code(instr._code), _datsize(instr._datsize), _data(new char[_datsize])
    { memcpy(_data, instr._data, _datsize); }
    ~Instruction()  { delete[] _data; }	// and we must then clean up after it


    opcode Code() const         { return _code; }
    const char* Data() const    { return _data; }
private:
    opcode  _code;
    size_t  _datsize;
    char*   _data;  // additional data

};