Article View: comp.std.c
Article #5986Re: Multiple typedefs
From: Doug Gwyn
Date: Tue, 02 May 1989 05:38
Date: Tue, 02 May 1989 05:38
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1083 bytes
In article <2402@lethe.UUCP> dave@lethe.UUCP (Dave Collier-Brown) writes: > Is there a technical reason for the difference in redefinition rules >for macros -vs- typedefs, ...? Yes. Oh, you want to know what it is? Well, consider how the compiler is going to parse a complex declaration containing several typedefs. How does it know whether you are defining the same typedef a second time or are just using it to help typedef something else? There's no analogous problem with #define, due to its unambiguous syntax that makes it clear what identifier is being defined.
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arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!dogie.macc.wisc.edu!indri!aplcen!haven!adm!smoke!gwynReferences:
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!dogie.macc.wisc.edu!indri!aplcen!haven!adm!smoke!gwyn From: gwyn@smoke.BRL.MIL (Doug Gwyn) Newsgroups: comp.std.c Subject: Re: Multiple typedefs Keywords: typedefs, includes, defines Message-ID: <10190@smoke.BRL.MIL> Date: 2 May 89 05:38:25 GMT References: <2322@lethe.UUCP> <10167@smoke.BRL.MIL> <2402@lethe.UUCP> Reply-To: gwyn@brl.arpa (Doug Gwyn) Organization: Ballistic Research Lab (BRL), APG, MD. Lines: 13