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Article #4852Re: huge-far pointer and Turbo C++ V1
From: Nino Margetic
Date: Fri, 22 Feb 1991 10:40
Date: Fri, 22 Feb 1991 10:40
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1544 bytes
In <91052.082658ISSHST@BYUVM.BITNET> ISSHST@BYUVM.BITNET writes: >My understanding of TC++ is that a single data structure cannot be larger >than 64K. To solve this, use an array of pointers and allocate each row >of the z-buffer separately. Then you can use whatever of 640K is left. ***** Not quite. If you declare your pointer as huge, and use farmalloc/farcalloc, then you can allocate ALL available RAM in just one object. Since the farmallooc/farcalloc takes an unsigned long it is NOT the same as malloc/calloc - not even in the large memory models. BUT, you HAVE to use HUGE pointers - otherwise your far pointer will wrap at the 64k boundary. Hope this helps. --Nino -- Janet: nino@uk.ac.ucl.sm.mph \ Nino Margetic Earn/Bitnet: nino@mph.sm.ucl.ac.uk \ Dept. of Medical Physics Internet: nino%mph.sm.ucl.ac.uk@nsfnet-relay.ac.uk\ University College London Bang-path: ....!mcvax!ukc!ucl-mph!nino \ Tel:+44-71-380-9300/x5313
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arc1-ca.pugleaf.net!utzoo!censor!geac!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!spool.mu.edu!uunet!mcsun!ukc!educ-isis!teexnmaReferences:
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Path: arc1-ca.pugleaf.net!utzoo!censor!geac!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!spool.mu.edu!uunet!mcsun!ukc!educ-isis!teexnma From: teexnma@ioe.lon.ac.uk (Nino Margetic) Newsgroups: comp.os.msdos.programmer Subject: Re: huge-far pointer and Turbo C++ V1 Message-ID: <1991Feb22.104059.24524@ioe.lon.ac.uk> Date: 22 Feb 91 10:40:59 GMT References: <8138@exodus.Eng.Sun.COM> <91052.082658ISSHST@BYUVM.BITNET> Reply-To: nino@mph.sm.ucl.ac.uk Organization: Dept. of Medical Physics - University College London Lines: 21