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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