[Gambas-user] Bitwise Operations Wish

[Werner]

On 02/09/10 20:06, Benoît Minisini wrote:
>> 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,
>
>   
Thanks, I was under the misguided impression these were for booleans.

CHRISTMAS! :-)

Werner