From: Damian Yerrick <DONT DOT YOU DOT DAREd_yerrick AT hotmail DOT comSEND DOT SPAM>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Errors using Bit Fields in DJGPP
Organization: Pin Eight Software  http://pineight.8m.com/
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NNTP-Posting-Date: Fri, 03 Mar 2000 05:12:01 GMT
Distribution: world
Date: Fri, 03 Mar 2000 05:12:01 GMT
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

On Thu, 02 Mar 2000 09:24:10 -0500, "Campbell, Rolf [SKY:1U32:EXCH]"
<moscoop AT americasm01 DOT nt DOT com> wrote:

>JoeGuy wrote:
>
>> Are bit fields possible in DJGPP? I tried the following code and got erros:
>>
>> unsigned getInput():4
>> {
>>     unsigned up : 1 = key[KEY_UP];
>>     unsigned left : 1 = key[KEY_LEFT];
>>     unsigned right : 1 = key[KEY_RIGHT];
>>     unsigned down : 1 = key[KEY_DOWN];
>>
>> Notice I've tried to return a bit field also, but all get errors:
>
>Bit fields are only allowed inside a struct/class.

So try this:

typedef struct NESInputByte
{
  unsigned a:1;
  unsigned b:1;
  unsigned select:1;
  unsigned start:1;
  unsigned up:1;
  unsigned down:1;
  unsigned left:1;
  unsigned right:1;
} NESInputByte;

then tossing a NESInputByte wherever you need to track keypresses.

But I never use C bitfields; they're too implementation defined.
I use enums and bitwise booleans instead.

-- 
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