How do I manipulate nibbles?

[Onceler]

I want to be able to read and write nibbles. Also how could I make sure that all my nibbles go into a file an even number of times so that there is no crash(or anything like that)?
How would I go about this?
Thanks

[Seraphimsan]

I've often wondered this my self, it think it would require some serious low level control of the bit. if it's even possible

[Athar]

You can simply use bit shifting to set whichever bits you like, e.g. with the following functions:

template <class I> void setNibble(I& o,int index,I nibbleVal)
{
  o&=~(15<<(index*4));     //blank nibble
  o|=nibbleVal<<(index*4); //set new value
}

template <class I> I getNibble(const I& o,int index)
{
  return (o&(15<<(index*4)))>>(index*4);
}

Integrate them into a class and you're done.

[Duthomhas]

Er, your file must always be a multiple of two nibbles long... so you will have to consider that when you access the file.