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From: | ranger3 AT m-net DOT arbornet DOT org |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | Re: typedef'ing a 24-bit integer |
Date: | Tue, 01 Jun 1999 03:18:33 GMT |
Organization: | Deja.com - Share what you know. Learn what you don't. |
Lines: | 34 |
Message-ID: | <7ivjea$s5s$1@nnrp1.deja.com> |
References: | <37459ABF DOT FF51CA41 AT aaual DOT ualg DOT pt> <374601DE DOT 630CEA74 AT cartsys DOT com> <3746C21F DOT 201AF26D AT user DOT rose DOT com> |
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To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
Reply-To: | djgpp AT delorie DOT com |
In article <3746C21F DOT 201AF26D AT user DOT rose DOT com>, djgpp AT delorie DOT com wrote: > Nate Eldredge wrote: > > > Miguel Guerreiro wrote: > > > > > > How can you do somethin kinda like this: > > > > > > typedef int24 (24-bit integer) > > > typedef uint24 (24-bit unsigned int) > > > > > > I want it to take *exactly* 24-bit of space > > > > You can't. > > Couldn't he create a struct with a 24-bit bit field? It would still > take 32 bits of space but would manipulate as 24 bits (I think). You can do something like : typedef struct s { unsigned int : 24 } __attribute__((packed)) uint24 ; under gcc and #pragma(1) under msoft c++ to get a packed 24 bit structure. The signed follows from above. Sent via Deja.com http://www.deja.com/ Share what you know. Learn what you don't.
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