[Gambas-user] Bitwise Operations Wish

[Benoît Minisini]

> There were days when binary values were actually represented in bits
> within a byte or word. This is still true when interfacing to some boxes
> such as PLCs.
> Likewise, some operations - eg calculating a CRC - are very awkward to
> implement without bitwise operations.
> 
> It would be really nice to have this functionality. Anyone who has ever
> programmed in Assembler propably knows what I mean.
> 
> The following would be a fairly complete set, I think:
> 
> BitAnd( a AS Expression, b AS Expression) AS Expression

-> a AND b

> BitOr( a AS Expression, b AS Expression) AS Expression

-> a OR b

> BitXOr( a AS Expression, b AS Expression) AS Expression

-> a XOR b

> BitNot( a AS Expression) AS Expression

-> NOT a

> 
> BitShift( a AS Expression, count as Byte) AS Expression

-> Lsl(a, count)
-> Lsr(a, count)
-> Asl(a, count)
-> Asr(a, count)

> BitRotate( a AS Expression, count as Byte) AS Expression

-> Rol(a, count)
-> Ror(a, count)

> 
> where Expression boils down to one of the following:
> Byte
> Short
> Integer
> Long
> 
> If expressions a and b are not the same size the shorter one needs to be
> expanded with zeroes (MSB side) to match.

That is what they do.

Regards,

-- 
Benoît Minisini