Re: Adding garbage collection to C++

henry@zoo.toronto.edu (Henry Spencer)
Fri, 14 Aug 1992 21:29:17 GMT

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Newsgroups: comp.compilers
From: henry@zoo.toronto.edu (Henry Spencer)
Organization: U of Toronto Zoology
Date: Fri, 14 Aug 1992 21:29:17 GMT
References: 92-08-052 92-08-063
Keywords: C, GC

our moderator writes:
>[It is my impression that an ANSI C program is allowed to copy a pointer to
>a long and later back to a pointer of the same type...


Yes, but it doesn't promise what you'll get. Many older definitions of C
promised that you could convert a pointer to a suitably-large integer
(long isn't necessarily large enough!) and then back again unchanged.
Some of the ANSI C drafts also promised that. The final standard does
not.


Don't feel bad about overlooking this, Dennis Ritchie missed it too...
which is why even revised K&R2 gets this wrong. (Unless there's been a
chance for another revision recently; Dennis does know about this.)
--
Henry Spencer @ U of Toronto Zoology, henry@zoo.toronto.edu utzoo!henry
--

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