I can see your variable is just one byte, then Mark 's solution does
the  same thing but more efficiently.

Best regards,

Isaac


Justin Richards escreveu:
> Some months ago I posted code that implemented functions for accessing
> variables as bit-arrays.
> At that time somebody had a problem much like yours.
>
> Oops, that was me.  I do apologise to the list for repeating the question.
>
> I even cut and paste your code below into my docs for later use.
>
> Thanks again
>
>
> Ex.:
> void SetBit( char *v, int n )
>    {
>    v[n>>3] |=3D 1 << ( n & 7 );
>    }
>
> void ClrBit( char *v, int n )
>    {
>    v[n>>3] &=3D ~( 1 << ( n & 7 ));
>    }
>
> int ReadBit( char *v, int n )
>    {
>    return ( v[n>>3] & ( 1 << ( n & 7 ))) ? 1 : 0;
>    }
>
> 2009/11/25 Isaac Marino Bavaresco <isaacbavaresco@yahoo.com.br>
>
>   =

>> Some months ago I posted code that implemented functions for accessing
>> variables as bit-arrays.
>> At that time somebody had a problem much like yours.
>>
>> Perhaps you can find the original thread in the archives.
>>
>> Best regards,
>>
>> Isaac
>>
>>
>> Justin Richards escreveu:
>>     =

>>> Thanks Bob,
>>>
>>> struggling to understand here but I guess would use it like
>>>
>>> if (bitof(days.day,tm_wday))
>>> {
>>>     do something
>>> }
>>>
>>> and if tm_wday =3D 1 (monday)
>>>
>>> it expand to
>>>
>>> if(((bitv *)&(days.day))->b1)
>>>
>>> and now I am lost.  What is bitv and how can I break it down further.
>>>
>>> Cheers Justin
>>> 2009/11/25 Bob Blick <bobblick@ftml.net>
>>>
>>>
>>>       =

>>>> You might be able to use this to help you access bits:
>>>>
>>>> #define _paste(a,b)         a##b
>>>> #define bitof(var,num)      (((bitv *)&(var))->_paste(b,num))
>>>>
>>>> Cheers,
>>>>
>>>> Bob
>>>>
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>> Lancamento: 11/24/09 05:46:00
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