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From: David.Plummer@p0.f70.n140.z1.FIDONET.ORG (David Plummer)
Newsgroups: comp.sys.amiga.misc
Subject: Bitfields in C
Message-ID: <214.2826444A@weyr.FIDONET.ORG>
Date: 5 May 91 20:38:10 GMT
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Does anyone know how to build an easily- addressable bitfield array in 
C?  Exactly what I would like to be able to do it this:                
                                                                       
struct bits {                                                          
   unsigned long thebits[31] : 1;                                      
}                                                                      
                                                                       
which of course is impossible, since C doesn't allow arrays in the     
bitfield descriptors.                                                  
                                                                       
Even better would be                                                   
                                                                       
struct bit {                                                           
   unsigned long thebit : 1;                                           
}                                                                      
                                                                       
struct mybits {                                                        
   struct bit bitlist[32767];                                          
}                                                                      
                                                                       
Which Lattice at least does not pack into memory, but rather allocates 
at 32767 longs of data.  If you have any idea what I'm talking about,  
does anyone have any suggestions?
 
Thanks a lot,
Dave (plummerd@max.cc.uregina.ca)


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