Article View: comp.std.c
Article #1804Re: a "derived-declarator-type-list" isn't
From: Doug Gwyn
Date: Mon, 08 Oct 1990 11:01
Date: Mon, 08 Oct 1990 11:01
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1868 bytes
In article <1990Oct8.000812.24800@zoo.toronto.edu> henry@zoo.toronto.edu (Henry Spencer) writes: >In several of the subsections of 3.5.4, the result of a particular form >of declarator is defined in terms of the result of a simpler form, which >is said to supply a type "derived-declarator-type-list T". >There is just one problem with this. Nothing ever defines what a d-d-t-l >is. Despite the name, it is not a list of derived declarator types, >and indeed it is not a list of types at all. The ill-defined horror of >"top type" lives on, sigh... >An experienced C programmer, of course, "knows" what the descriptions mean. >But he won't figure it out from the standard. I think you're hallucinating problems into existence. The examples in questions all runs something like this: "If, in the declaration "T D1", D1 has the form ...[some well-defined syntactic construct involving d]..., and the type specified for "ident" in the declaration "T D" is "derived- declarator-type-list T", then the type specified for "ident" is ... [some type description involving "derived-declarator-type-list" and "T"]". This is nothing more than the introduction of a bound variable "derived- declarator-type-list" used in the same manner as the bound variable "T". We could have used "X" instead of "derived-declarator-type-list". There is no need to provide a grammatical specification of the phrase, any more than there is a need to describe the phrase "T" in the grammar.
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!samsung!umich!yale!cmcl2!adm!smoke!gwyn From: gwyn@smoke.BRL.MIL (Doug Gwyn) Newsgroups: comp.std.c Subject: Re: a "derived-declarator-type-list" isn't Message-ID: <14048@smoke.BRL.MIL> Date: 8 Oct 90 11:01:39 GMT References: <1990Oct8.000812.24800@zoo.toronto.edu> Organization: U.S. Army Ballistic Research Laboratory, APG, MD. Lines: 22